diff options
Diffstat (limited to 'apps/plugins/pdbox/dbestfit-3.3')
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/CHANGES | 24 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/FILES | 30 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/Makefile | 76 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/Malloc.c | 402 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/README | 44 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/bmalloc.c | 740 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/bmalloc.h | 12 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/bysize.c | 848 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/bysize.h | 8 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/dmalloc.c | 1380 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/dmalloc.h | 16 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/dmytest.c | 276 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/malloc.man | 190 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/mytest.c | 140 | ||||
-rw-r--r-- | apps/plugins/pdbox/dbestfit-3.3/thoughts | 340 |
15 files changed, 4526 insertions, 0 deletions
diff --git a/apps/plugins/pdbox/dbestfit-3.3/CHANGES b/apps/plugins/pdbox/dbestfit-3.3/CHANGES new file mode 100644 index 0000000000..f244f66f87 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/CHANGES | |||
@@ -0,0 +1,24 @@ | |||
1 | Changes | ||
2 | |||
3 | * (March 30 2005) Daniel | ||
4 | |||
5 | Linus Nielsen Feltzing provided a patch that corrected several minor problems | ||
6 | that prevented dbestfit from working good. Linus also tested and timed | ||
7 | dbestfit for real in a target where he replaced the pSOS-provided memory | ||
8 | subsystem. | ||
9 | |||
10 | * 3.2 | ||
11 | |||
12 | Made eons ago, all older changes have been forgotten. | ||
13 | Changes | ||
14 | |||
15 | * (March 30 2005) Daniel | ||
16 | |||
17 | Linus Nielsen Feltzing provided a patch that corrected several minor problems | ||
18 | that prevented dbestfit from working good. Linus also tested and timed | ||
19 | dbestfit for real in a target where he replaced the pSOS-provided memory | ||
20 | subsystem. | ||
21 | |||
22 | * 3.2 | ||
23 | |||
24 | Made eons ago, all older changes have been forgotten. | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/FILES b/apps/plugins/pdbox/dbestfit-3.3/FILES new file mode 100644 index 0000000000..684a225972 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/FILES | |||
@@ -0,0 +1,30 @@ | |||
1 | /bysize.c | ||
2 | /bysize.h | ||
3 | /bmalloc.c | ||
4 | /bmalloc.h | ||
5 | /dmalloc.c | ||
6 | /dmalloc.h | ||
7 | /FILES | ||
8 | /README | ||
9 | /Makefile | ||
10 | /Malloc.c | ||
11 | /mytest.c | ||
12 | /dmytest.c | ||
13 | /thoughts | ||
14 | /malloc.man | ||
15 | /CHANGES | ||
16 | /bysize.c | ||
17 | /bysize.h | ||
18 | /bmalloc.c | ||
19 | /bmalloc.h | ||
20 | /dmalloc.c | ||
21 | /dmalloc.h | ||
22 | /FILES | ||
23 | /README | ||
24 | /Makefile | ||
25 | /Malloc.c | ||
26 | /mytest.c | ||
27 | /dmytest.c | ||
28 | /thoughts | ||
29 | /malloc.man | ||
30 | /CHANGES | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/Makefile b/apps/plugins/pdbox/dbestfit-3.3/Makefile new file mode 100644 index 0000000000..e34b02e918 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/Makefile | |||
@@ -0,0 +1,76 @@ | |||
1 | |||
2 | OBJS1 = bmalloc.o bysize.o mytest.o | ||
3 | TARGET1 = mytest | ||
4 | |||
5 | OBJS2 = dmalloc.o bmalloc.o bysize.o Malloc.o | ||
6 | TARGET2 = mtest | ||
7 | |||
8 | OBJS3 = dmalloc.o bmalloc.o bysize.o dmytest.o | ||
9 | TARGET3 = dmytest | ||
10 | |||
11 | CFLAGS = -g -DUNIX -DBMALLOC -Wall -pedantic -DDEBUG | ||
12 | CC = gcc | ||
13 | |||
14 | all: $(TARGET1) $(TARGET2) $(TARGET3) | ||
15 | |||
16 | $(TARGET1): $(OBJS1) | ||
17 | $(CC) -g -o $(TARGET1) $(OBJS1) | ||
18 | |||
19 | $(TARGET2): $(OBJS2) | ||
20 | $(CC) -g -o $(TARGET2) $(OBJS2) | ||
21 | |||
22 | $(TARGET3): $(OBJS3) | ||
23 | $(CC) -g -o $(TARGET3) $(OBJS3) | ||
24 | |||
25 | bmalloc.o: bmalloc.c | ||
26 | dmalloc.o: dmalloc.c | ||
27 | mytest.o: mytest.c | ||
28 | dmytest.o: dmytest.c | ||
29 | Malloc.o : Malloc.c | ||
30 | bysize.o : bysize.c | ||
31 | |||
32 | tgz: | ||
33 | @(dir=`pwd`;name=`basename $$dir`;echo Creates $$name.tar.gz; cd .. ; \ | ||
34 | tar -cf $$name.tar `cat $$name/FILES | sed "s:^/:$$name/:g"` ; \ | ||
35 | gzip $$name.tar ; chmod a+r $$name.tar.gz ; mv $$name.tar.gz $$name/) | ||
36 | |||
37 | clean: | ||
38 | rm -f *.o *~ $(TARGET1) $(TARGET2) $(TARGET3) | ||
39 | |||
40 | OBJS1 = bmalloc.o bysize.o mytest.o | ||
41 | TARGET1 = mytest | ||
42 | |||
43 | OBJS2 = dmalloc.o bmalloc.o bysize.o Malloc.o | ||
44 | TARGET2 = mtest | ||
45 | |||
46 | OBJS3 = dmalloc.o bmalloc.o bysize.o dmytest.o | ||
47 | TARGET3 = dmytest | ||
48 | |||
49 | CFLAGS = -g -DUNIX -DBMALLOC -Wall -pedantic -DDEBUG | ||
50 | CC = gcc | ||
51 | |||
52 | all: $(TARGET1) $(TARGET2) $(TARGET3) | ||
53 | |||
54 | $(TARGET1): $(OBJS1) | ||
55 | $(CC) -g -o $(TARGET1) $(OBJS1) | ||
56 | |||
57 | $(TARGET2): $(OBJS2) | ||
58 | $(CC) -g -o $(TARGET2) $(OBJS2) | ||
59 | |||
60 | $(TARGET3): $(OBJS3) | ||
61 | $(CC) -g -o $(TARGET3) $(OBJS3) | ||
62 | |||
63 | bmalloc.o: bmalloc.c | ||
64 | dmalloc.o: dmalloc.c | ||
65 | mytest.o: mytest.c | ||
66 | dmytest.o: dmytest.c | ||
67 | Malloc.o : Malloc.c | ||
68 | bysize.o : bysize.c | ||
69 | |||
70 | tgz: | ||
71 | @(dir=`pwd`;name=`basename $$dir`;echo Creates $$name.tar.gz; cd .. ; \ | ||
72 | tar -cf $$name.tar `cat $$name/FILES | sed "s:^/:$$name/:g"` ; \ | ||
73 | gzip $$name.tar ; chmod a+r $$name.tar.gz ; mv $$name.tar.gz $$name/) | ||
74 | |||
75 | clean: | ||
76 | rm -f *.o *~ $(TARGET1) $(TARGET2) $(TARGET3) | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/Malloc.c b/apps/plugins/pdbox/dbestfit-3.3/Malloc.c new file mode 100644 index 0000000000..25e30706fe --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/Malloc.c | |||
@@ -0,0 +1,402 @@ | |||
1 | #include <stdio.h> | ||
2 | #include <stdlib.h> | ||
3 | #include <string.h> | ||
4 | #include <time.h> | ||
5 | |||
6 | /* Storleken på allokeringen bestäms genom att först slumpas en position i | ||
7 | "size_table" ut, sedan slumpas en storlek mellan den postionen och nästa värde | ||
8 | i tabellen. Genom att ha tabellen koncentrerad med låga värden, så skapas | ||
9 | flest såna. Rutinen håller på tills minnet en allokeringen nekas. Den kommer | ||
10 | aldrig att ha mer än MAXIMAL_MEMORY_TO_ALLOCATE allokerat samtidigt. Maximalt | ||
11 | har den MAX_ALLOCATIONS allokeringar samtidigt. | ||
12 | |||
13 | Statistiskt sätt så kommer efter ett tag MAX_ALLOCATIONS/2 allokeringar finnas | ||
14 | samtidigt, med varje allokering i median med värdet av halva "size_table". | ||
15 | |||
16 | När minnet är slut (malloc()=NULL), frågas användaren om han ska fortsätta. | ||
17 | |||
18 | Med jämna mellanrum skrivs statisktik ut på skärmen. (DISPLAY_WHEN) | ||
19 | |||
20 | För att stressa systemet med fler små allokeringar, så kan man öka | ||
21 | MAX_ALLOCATIONS. AMOUNT_OF_MEMORY bör få den att slå i taket fortare om man | ||
22 | minskar det. | ||
23 | |||
24 | Ingen initiering görs av slumptalen, så allt är upprepbart (men plocka bort | ||
25 | kommentaren på srand() och det löser sig. | ||
26 | |||
27 | */ | ||
28 | |||
29 | /*#undef BMALLOC*/ | ||
30 | |||
31 | #ifdef BMALLOC | ||
32 | #include "dmalloc.h" | ||
33 | |||
34 | #include "bmalloc.h" | ||
35 | #endif | ||
36 | |||
37 | #define MAX_ALLOCATIONS 100000 | ||
38 | #define AMOUNT_OF_MEMORY 180000 /* bytes */ | ||
39 | #define MAXIMAL_MEMORY_TO_ALLOCATE 100000 /* Sätt den här högre än | ||
40 | AMOUNT_OF_MEMORY, och malloc() bör | ||
41 | returnera NULL förr eller senare */ | ||
42 | |||
43 | #define DISPLAY_WHEN (123456) /* When to display statistic */ | ||
44 | |||
45 | #define min(a, b) (((a) < (b)) ? (a) : (b)) | ||
46 | #define BOOL char | ||
47 | #define TRUE 1 | ||
48 | #define FALSE 0 | ||
49 | |||
50 | typedef struct { | ||
51 | char *memory; | ||
52 | long size; | ||
53 | char filled_with; | ||
54 | long table_position; | ||
55 | } MallocStruct; | ||
56 | |||
57 | /* | ||
58 | Skapar en lista med MAX_ALLOCATIONS storlek där det slumpvis allokeras | ||
59 | eller reallokeras i. | ||
60 | */ | ||
61 | |||
62 | MallocStruct my_mallocs[MAX_ALLOCATIONS]; | ||
63 | |||
64 | long size_table[]={5,8,10,11,12,14,16,18,20,26,33,50,70,90,120,150,200,400,800,1000,2000,4000,8000,10000,11000,12000,13000,14000,15000,16000,17000,18000}; | ||
65 | #define TABLESIZE ((sizeof(size_table)-1)/sizeof(long)) | ||
66 | long size_allocs[TABLESIZE]; | ||
67 | |||
68 | int main(void) | ||
69 | { | ||
70 | int i; | ||
71 | long count=-1; | ||
72 | long count_free=0, count_malloc=0, count_realloc=0; | ||
73 | long total_memory=0; | ||
74 | BOOL out_of_memory=FALSE; | ||
75 | unsigned int seed = time( NULL ); | ||
76 | |||
77 | #ifdef BMALLOC | ||
78 | void *thisisourheap; | ||
79 | thisisourheap = (malloc)(AMOUNT_OF_MEMORY); | ||
80 | if(!thisisourheap) | ||
81 | return -1; /* can't get memory */ | ||
82 | add_pool(thisisourheap, AMOUNT_OF_MEMORY); | ||
83 | #endif | ||
84 | |||
85 | seed = 1109323906; | ||
86 | |||
87 | srand( seed ); /* Initialize randomize */ | ||
88 | |||
89 | printf("seed: %d\n", seed); | ||
90 | |||
91 | while (!out_of_memory) { | ||
92 | long number=rand()%MAX_ALLOCATIONS; | ||
93 | long size; | ||
94 | long table_position=rand()%TABLESIZE; | ||
95 | char fill_with=rand()&255; | ||
96 | |||
97 | count++; | ||
98 | |||
99 | size=rand()%(size_table[table_position+1]-size_table[table_position])+size_table[table_position]; | ||
100 | |||
101 | /* fprintf(stderr, "number %d size %d\n", number, size); */ | ||
102 | |||
103 | if (my_mallocs[number].size) { /* Om allokering redan finns på den här | ||
104 | positionen, så reallokerar vi eller | ||
105 | friar. */ | ||
106 | long old_size=my_mallocs[number].size; | ||
107 | if (my_mallocs[number].size && fill_with<40) { | ||
108 | free(my_mallocs[number].memory); | ||
109 | total_memory -= my_mallocs[number].size; | ||
110 | count_free++; | ||
111 | size_allocs[my_mallocs[number].table_position]--; | ||
112 | size=0; | ||
113 | my_mallocs[number].size = 0; | ||
114 | my_mallocs[number].memory = NULL; | ||
115 | } else { | ||
116 | /* | ||
117 | * realloc() part | ||
118 | * | ||
119 | */ | ||
120 | char *temp; | ||
121 | #if 0 | ||
122 | if(my_mallocs[number].size > size) { | ||
123 | printf("*** %d is realloc()ed to %d\n", | ||
124 | my_mallocs[number].size, size); | ||
125 | } | ||
126 | #endif | ||
127 | if (total_memory-old_size+size>MAXIMAL_MEMORY_TO_ALLOCATE) | ||
128 | goto output; /* for-loop */ | ||
129 | temp = (char *)realloc(my_mallocs[number].memory, size); | ||
130 | if (!temp) | ||
131 | out_of_memory=TRUE; | ||
132 | else { | ||
133 | my_mallocs[number].memory = temp; | ||
134 | |||
135 | my_mallocs[number].size=size; | ||
136 | size_allocs[my_mallocs[number].table_position]--; | ||
137 | size_allocs[table_position]++; | ||
138 | total_memory -= old_size; | ||
139 | total_memory += size; | ||
140 | old_size=min(old_size, size); | ||
141 | while (--old_size>0) { | ||
142 | if (my_mallocs[number].memory[old_size]!=my_mallocs[number].filled_with) | ||
143 | fprintf(stderr, "Wrong filling!\n"); | ||
144 | } | ||
145 | count_realloc++; | ||
146 | } | ||
147 | } | ||
148 | } else { | ||
149 | if (total_memory+size>MAXIMAL_MEMORY_TO_ALLOCATE) { | ||
150 | goto output; /* for-loop */ | ||
151 | } | ||
152 | my_mallocs[number].memory=(char *)malloc(size); /* Allokera! */ | ||
153 | if (!my_mallocs[number].memory) | ||
154 | out_of_memory=TRUE; | ||
155 | else { | ||
156 | size_allocs[table_position]++; | ||
157 | count_malloc++; | ||
158 | total_memory += size; | ||
159 | } | ||
160 | } | ||
161 | |||
162 | if(!out_of_memory) { | ||
163 | my_mallocs[number].table_position=table_position; | ||
164 | my_mallocs[number].size=size; | ||
165 | my_mallocs[number].filled_with=fill_with; | ||
166 | memset(my_mallocs[number].memory, fill_with, size); | ||
167 | } | ||
168 | output: | ||
169 | if (out_of_memory || !(count%DISPLAY_WHEN)) { | ||
170 | printf("(%d) malloc %d, realloc %d, free %d, total size %d\n", count, count_malloc, count_realloc, count_free, total_memory); | ||
171 | { | ||
172 | int count; | ||
173 | printf("[size bytes]=[number of allocations]\n"); | ||
174 | for (count=0; count<TABLESIZE; count++) { | ||
175 | printf("%ld=%ld, ", size_table[count], size_allocs[count]); | ||
176 | } | ||
177 | printf("\n\n"); | ||
178 | } | ||
179 | } | ||
180 | if (out_of_memory) { | ||
181 | fprintf(stderr, "Memory is out! Continue (y/n)"); | ||
182 | switch (getchar()) { | ||
183 | case 'y': | ||
184 | case 'Y': | ||
185 | out_of_memory=FALSE; | ||
186 | break; | ||
187 | } | ||
188 | fprintf(stderr, "\n"); | ||
189 | } | ||
190 | } | ||
191 | for(i = 0;i < MAX_ALLOCATIONS;i++) { | ||
192 | if((my_mallocs[i].memory)) | ||
193 | free(my_mallocs[i].memory); | ||
194 | } | ||
195 | |||
196 | print_lists(); | ||
197 | |||
198 | printf("\n"); | ||
199 | return 0; | ||
200 | } | ||
201 | |||
202 | #include <stdio.h> | ||
203 | #include <stdlib.h> | ||
204 | #include <string.h> | ||
205 | #include <time.h> | ||
206 | |||
207 | /* Storleken på allokeringen bestäms genom att först slumpas en position i | ||
208 | "size_table" ut, sedan slumpas en storlek mellan den postionen och nästa värde | ||
209 | i tabellen. Genom att ha tabellen koncentrerad med låga värden, så skapas | ||
210 | flest såna. Rutinen håller på tills minnet en allokeringen nekas. Den kommer | ||
211 | aldrig att ha mer än MAXIMAL_MEMORY_TO_ALLOCATE allokerat samtidigt. Maximalt | ||
212 | har den MAX_ALLOCATIONS allokeringar samtidigt. | ||
213 | |||
214 | Statistiskt sätt så kommer efter ett tag MAX_ALLOCATIONS/2 allokeringar finnas | ||
215 | samtidigt, med varje allokering i median med värdet av halva "size_table". | ||
216 | |||
217 | När minnet är slut (malloc()=NULL), frågas användaren om han ska fortsätta. | ||
218 | |||
219 | Med jämna mellanrum skrivs statisktik ut på skärmen. (DISPLAY_WHEN) | ||
220 | |||
221 | För att stressa systemet med fler små allokeringar, så kan man öka | ||
222 | MAX_ALLOCATIONS. AMOUNT_OF_MEMORY bör få den att slå i taket fortare om man | ||
223 | minskar det. | ||
224 | |||
225 | Ingen initiering görs av slumptalen, så allt är upprepbart (men plocka bort | ||
226 | kommentaren på srand() och det löser sig. | ||
227 | |||
228 | */ | ||
229 | |||
230 | /*#undef BMALLOC*/ | ||
231 | |||
232 | #ifdef BMALLOC | ||
233 | #include "dmalloc.h" | ||
234 | |||
235 | #include "bmalloc.h" | ||
236 | #endif | ||
237 | |||
238 | #define MAX_ALLOCATIONS 100000 | ||
239 | #define AMOUNT_OF_MEMORY 180000 /* bytes */ | ||
240 | #define MAXIMAL_MEMORY_TO_ALLOCATE 100000 /* Sätt den här högre än | ||
241 | AMOUNT_OF_MEMORY, och malloc() bör | ||
242 | returnera NULL förr eller senare */ | ||
243 | |||
244 | #define DISPLAY_WHEN (123456) /* When to display statistic */ | ||
245 | |||
246 | #define min(a, b) (((a) < (b)) ? (a) : (b)) | ||
247 | #define BOOL char | ||
248 | #define TRUE 1 | ||
249 | #define FALSE 0 | ||
250 | |||
251 | typedef struct { | ||
252 | char *memory; | ||
253 | long size; | ||
254 | char filled_with; | ||
255 | long table_position; | ||
256 | } MallocStruct; | ||
257 | |||
258 | /* | ||
259 | Skapar en lista med MAX_ALLOCATIONS storlek där det slumpvis allokeras | ||
260 | eller reallokeras i. | ||
261 | */ | ||
262 | |||
263 | MallocStruct my_mallocs[MAX_ALLOCATIONS]; | ||
264 | |||
265 | long size_table[]={5,8,10,11,12,14,16,18,20,26,33,50,70,90,120,150,200,400,800,1000,2000,4000,8000,10000,11000,12000,13000,14000,15000,16000,17000,18000}; | ||
266 | #define TABLESIZE ((sizeof(size_table)-1)/sizeof(long)) | ||
267 | long size_allocs[TABLESIZE]; | ||
268 | |||
269 | int main(void) | ||
270 | { | ||
271 | int i; | ||
272 | long count=-1; | ||
273 | long count_free=0, count_malloc=0, count_realloc=0; | ||
274 | long total_memory=0; | ||
275 | BOOL out_of_memory=FALSE; | ||
276 | unsigned int seed = time( NULL ); | ||
277 | |||
278 | #ifdef BMALLOC | ||
279 | void *thisisourheap; | ||
280 | thisisourheap = (malloc)(AMOUNT_OF_MEMORY); | ||
281 | if(!thisisourheap) | ||
282 | return -1; /* can't get memory */ | ||
283 | add_pool(thisisourheap, AMOUNT_OF_MEMORY); | ||
284 | #endif | ||
285 | |||
286 | seed = 1109323906; | ||
287 | |||
288 | srand( seed ); /* Initialize randomize */ | ||
289 | |||
290 | printf("seed: %d\n", seed); | ||
291 | |||
292 | while (!out_of_memory) { | ||
293 | long number=rand()%MAX_ALLOCATIONS; | ||
294 | long size; | ||
295 | long table_position=rand()%TABLESIZE; | ||
296 | char fill_with=rand()&255; | ||
297 | |||
298 | count++; | ||
299 | |||
300 | size=rand()%(size_table[table_position+1]-size_table[table_position])+size_table[table_position]; | ||
301 | |||
302 | /* fprintf(stderr, "number %d size %d\n", number, size); */ | ||
303 | |||
304 | if (my_mallocs[number].size) { /* Om allokering redan finns på den här | ||
305 | positionen, så reallokerar vi eller | ||
306 | friar. */ | ||
307 | long old_size=my_mallocs[number].size; | ||
308 | if (my_mallocs[number].size && fill_with<40) { | ||
309 | free(my_mallocs[number].memory); | ||
310 | total_memory -= my_mallocs[number].size; | ||
311 | count_free++; | ||
312 | size_allocs[my_mallocs[number].table_position]--; | ||
313 | size=0; | ||
314 | my_mallocs[number].size = 0; | ||
315 | my_mallocs[number].memory = NULL; | ||
316 | } else { | ||
317 | /* | ||
318 | * realloc() part | ||
319 | * | ||
320 | */ | ||
321 | char *temp; | ||
322 | #if 0 | ||
323 | if(my_mallocs[number].size > size) { | ||
324 | printf("*** %d is realloc()ed to %d\n", | ||
325 | my_mallocs[number].size, size); | ||
326 | } | ||
327 | #endif | ||
328 | if (total_memory-old_size+size>MAXIMAL_MEMORY_TO_ALLOCATE) | ||
329 | goto output; /* for-loop */ | ||
330 | temp = (char *)realloc(my_mallocs[number].memory, size); | ||
331 | if (!temp) | ||
332 | out_of_memory=TRUE; | ||
333 | else { | ||
334 | my_mallocs[number].memory = temp; | ||
335 | |||
336 | my_mallocs[number].size=size; | ||
337 | size_allocs[my_mallocs[number].table_position]--; | ||
338 | size_allocs[table_position]++; | ||
339 | total_memory -= old_size; | ||
340 | total_memory += size; | ||
341 | old_size=min(old_size, size); | ||
342 | while (--old_size>0) { | ||
343 | if (my_mallocs[number].memory[old_size]!=my_mallocs[number].filled_with) | ||
344 | fprintf(stderr, "Wrong filling!\n"); | ||
345 | } | ||
346 | count_realloc++; | ||
347 | } | ||
348 | } | ||
349 | } else { | ||
350 | if (total_memory+size>MAXIMAL_MEMORY_TO_ALLOCATE) { | ||
351 | goto output; /* for-loop */ | ||
352 | } | ||
353 | my_mallocs[number].memory=(char *)malloc(size); /* Allokera! */ | ||
354 | if (!my_mallocs[number].memory) | ||
355 | out_of_memory=TRUE; | ||
356 | else { | ||
357 | size_allocs[table_position]++; | ||
358 | count_malloc++; | ||
359 | total_memory += size; | ||
360 | } | ||
361 | } | ||
362 | |||
363 | if(!out_of_memory) { | ||
364 | my_mallocs[number].table_position=table_position; | ||
365 | my_mallocs[number].size=size; | ||
366 | my_mallocs[number].filled_with=fill_with; | ||
367 | memset(my_mallocs[number].memory, fill_with, size); | ||
368 | } | ||
369 | output: | ||
370 | if (out_of_memory || !(count%DISPLAY_WHEN)) { | ||
371 | printf("(%d) malloc %d, realloc %d, free %d, total size %d\n", count, count_malloc, count_realloc, count_free, total_memory); | ||
372 | { | ||
373 | int count; | ||
374 | printf("[size bytes]=[number of allocations]\n"); | ||
375 | for (count=0; count<TABLESIZE; count++) { | ||
376 | printf("%ld=%ld, ", size_table[count], size_allocs[count]); | ||
377 | } | ||
378 | printf("\n\n"); | ||
379 | } | ||
380 | } | ||
381 | if (out_of_memory) { | ||
382 | fprintf(stderr, "Memory is out! Continue (y/n)"); | ||
383 | switch (getchar()) { | ||
384 | case 'y': | ||
385 | case 'Y': | ||
386 | out_of_memory=FALSE; | ||
387 | break; | ||
388 | } | ||
389 | fprintf(stderr, "\n"); | ||
390 | } | ||
391 | } | ||
392 | for(i = 0;i < MAX_ALLOCATIONS;i++) { | ||
393 | if((my_mallocs[i].memory)) | ||
394 | free(my_mallocs[i].memory); | ||
395 | } | ||
396 | |||
397 | print_lists(); | ||
398 | |||
399 | printf("\n"); | ||
400 | return 0; | ||
401 | } | ||
402 | |||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/README b/apps/plugins/pdbox/dbestfit-3.3/README new file mode 100644 index 0000000000..919875df96 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/README | |||
@@ -0,0 +1,44 @@ | |||
1 | Package: dbestfit - a dynamic memory allocator | ||
2 | Date: March 30, 2005 | ||
3 | Version: 3.3 | ||
4 | Author: Daniel Stenberg <daniel@haxx.se> | ||
5 | |||
6 | I wrote the dmalloc part for small allocation sizes to improve the behavior | ||
7 | of the built-in (first-fit) allocator found in pSOS (around 1996). | ||
8 | |||
9 | I wrote the bmalloc part (best-fit with splay-tree sorting) just for the fun | ||
10 | of it and to see how good malloc() clone I could make. The quality of my | ||
11 | implementation is still left to be judged in real-world tests. | ||
12 | |||
13 | TODO: | ||
14 | * Remove the final not-so-very-nice loop in dmalloc.c that checks for a block | ||
15 | with free fragments (when the list gets longer too much time might be spent | ||
16 | in that loop). | ||
17 | |||
18 | * Add semaphore protection in bmalloc. | ||
19 | |||
20 | * Make a separate application that samples the memory usage of a program | ||
21 | and is capable of replaying it (in order to test properly). | ||
22 | |||
23 | Package: dbestfit - a dynamic memory allocator | ||
24 | Date: March 30, 2005 | ||
25 | Version: 3.3 | ||
26 | Author: Daniel Stenberg <daniel@haxx.se> | ||
27 | |||
28 | I wrote the dmalloc part for small allocation sizes to improve the behavior | ||
29 | of the built-in (first-fit) allocator found in pSOS (around 1996). | ||
30 | |||
31 | I wrote the bmalloc part (best-fit with splay-tree sorting) just for the fun | ||
32 | of it and to see how good malloc() clone I could make. The quality of my | ||
33 | implementation is still left to be judged in real-world tests. | ||
34 | |||
35 | TODO: | ||
36 | * Remove the final not-so-very-nice loop in dmalloc.c that checks for a block | ||
37 | with free fragments (when the list gets longer too much time might be spent | ||
38 | in that loop). | ||
39 | |||
40 | * Add semaphore protection in bmalloc. | ||
41 | |||
42 | * Make a separate application that samples the memory usage of a program | ||
43 | and is capable of replaying it (in order to test properly). | ||
44 | |||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/bmalloc.c b/apps/plugins/pdbox/dbestfit-3.3/bmalloc.c new file mode 100644 index 0000000000..f95b4f6125 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/bmalloc.c | |||
@@ -0,0 +1,740 @@ | |||
1 | /***************************************************************************** | ||
2 | * | ||
3 | * Big (best-fit) Memory Allocation | ||
4 | * | ||
5 | * Author: Daniel Stenberg | ||
6 | * Date: March 5, 1997 | ||
7 | * Version: 2.0 | ||
8 | * Email: Daniel.Stenberg@sth.frontec.se | ||
9 | * | ||
10 | * | ||
11 | * Read 'thoughts' for theories and details in implementation. | ||
12 | * | ||
13 | * Routines meant to replace the most low level functions of an Operting | ||
14 | * System | ||
15 | * | ||
16 | * v2.0 | ||
17 | * - Made all size-routines get moved out from this file. This way, the size | ||
18 | * functions can much more easily get replaced. | ||
19 | * - Improved how new memory blocks get added to the size-sorted list. When | ||
20 | * not adding new pools, there should never ever be any list traversing | ||
21 | * since all information is dynamically gathered. | ||
22 | * | ||
23 | ****************************************************************************/ | ||
24 | |||
25 | #include <stdio.h> | ||
26 | #include <stdlib.h> | ||
27 | |||
28 | #include "bysize.h" | ||
29 | |||
30 | #ifndef TRUE | ||
31 | #define TRUE 1 | ||
32 | #endif | ||
33 | #ifndef FALSE | ||
34 | #define FALSE 0 | ||
35 | #endif | ||
36 | |||
37 | /* #define DEBUG */ | ||
38 | |||
39 | #define BMEM_ALIGN 64 /* resolution */ | ||
40 | |||
41 | #define BMEMERR_TOOSMALL -1 | ||
42 | |||
43 | /* this struct will be stored in all CHUNKS and AREAS */ | ||
44 | struct BlockInfo { | ||
45 | struct BlockInfo *lower; /* previous block in memory (lower address) */ | ||
46 | struct BlockInfo *higher; /* next block in memory (higher address) */ | ||
47 | unsigned long info; /* 31 bits size: 1 bit free boolean */ | ||
48 | #define INFO_FREE 1 | ||
49 | #define INFO_SIZE (~ INFO_FREE) /* inverted FREE bit pattern */ | ||
50 | |||
51 | /* FREE+SIZE Could be written to use ordinary bitfields if using a smart | ||
52 | (like gcc) compiler in a manner like: | ||
53 | int size:31; | ||
54 | int free:1; | ||
55 | |||
56 | The 'higher' pointer COULD be removed completely if the size is used as | ||
57 | an index to the higher one. This would then REQUIRE the entire memory | ||
58 | pool to be contiguous and it needs a 'terminating' "node" or an extra | ||
59 | flag that informs about the end of the list. | ||
60 | */ | ||
61 | }; | ||
62 | |||
63 | /* the BLOCK list should be sorted in a lower to higher address order */ | ||
64 | struct BlockInfo *blockHead=NULL; /* nothing from the start */ | ||
65 | |||
66 | void print_lists(void); | ||
67 | |||
68 | |||
69 | /*********************************************************************** | ||
70 | * | ||
71 | * remove_block() | ||
72 | * | ||
73 | * Remove the block from the address-sorted list. | ||
74 | * | ||
75 | ***********************************************************************/ | ||
76 | |||
77 | void remove_block(struct BlockInfo *block) | ||
78 | { | ||
79 | if(block->lower) | ||
80 | block->lower->higher = block->higher; | ||
81 | else | ||
82 | blockHead = block->higher; | ||
83 | if(block->higher) | ||
84 | block->higher->lower = block->lower; | ||
85 | } | ||
86 | |||
87 | /**************************************************************************** | ||
88 | * | ||
89 | * add_blocktolists() | ||
90 | * | ||
91 | * Adds the specified block at the specified place in the address-sorted | ||
92 | * list and at the appropriate place in the size-sorted. | ||
93 | * | ||
94 | ***************************************************************************/ | ||
95 | void add_blocktolists(struct BlockInfo *block, | ||
96 | struct BlockInfo *newblock, | ||
97 | size_t newsize) | ||
98 | { | ||
99 | struct BlockInfo *temp; /* temporary storage variable */ | ||
100 | if(block) { | ||
101 | /* `block' is now a lower address than 'newblock' */ | ||
102 | |||
103 | /* | ||
104 | * Check if the new CHUNK is wall-to-wall with the lower addressed | ||
105 | * one (if *that* is free) | ||
106 | */ | ||
107 | if(block->info&INFO_FREE) { | ||
108 | if((char *)block + (block->info&INFO_SIZE) == (char *)newblock) { | ||
109 | /* yes sir, this is our lower address neighbour, enlarge that one | ||
110 | pick it out from the list and recursively add that chunk and | ||
111 | then we escape */ | ||
112 | |||
113 | /* remove from size-sorted list: */ | ||
114 | remove_chunksize((char*)block+sizeof(struct BlockInfo)); | ||
115 | |||
116 | block->info += newsize; /* newsize is an even number and thus the FREE | ||
117 | bit is untouched */ | ||
118 | |||
119 | remove_block(block); /* unlink the block address-wise */ | ||
120 | |||
121 | /* recursively check our lower friend(s) */ | ||
122 | add_blocktolists(block->lower, block, block->info&INFO_SIZE); | ||
123 | return; | ||
124 | } | ||
125 | } | ||
126 | |||
127 | temp = block->higher; | ||
128 | |||
129 | block->higher = newblock; | ||
130 | newblock->lower = block; | ||
131 | newblock->higher = temp; | ||
132 | if(newblock->higher) | ||
133 | newblock->higher->lower = newblock; | ||
134 | } | ||
135 | else { | ||
136 | /* this block should preceed the heading one */ | ||
137 | temp = blockHead; | ||
138 | |||
139 | /* check if this is our higher addressed neighbour */ | ||
140 | if((char *)newblock + newsize == (char *)temp) { | ||
141 | |||
142 | /* yes, we are wall-to-wall with the higher CHUNK */ | ||
143 | if(temp->info&INFO_FREE) { | ||
144 | /* and the neighbour is even free, remove that one and enlarge | ||
145 | ourselves, call add_pool() recursively and then escape */ | ||
146 | |||
147 | remove_block(temp); /* unlink 'temp' from list */ | ||
148 | |||
149 | /* remove from size-sorted list: */ | ||
150 | remove_chunksize((char*)temp+sizeof(struct BlockInfo) ); | ||
151 | |||
152 | /* add the upper block's size on ourselves */ | ||
153 | newsize += temp->info&INFO_SIZE; | ||
154 | |||
155 | /* add the new, bigger block */ | ||
156 | add_blocktolists(block, newblock, newsize); | ||
157 | return; | ||
158 | } | ||
159 | } | ||
160 | |||
161 | blockHead = newblock; | ||
162 | newblock->higher = temp; | ||
163 | newblock->lower = NULL; /* there is no lower one */ | ||
164 | if(newblock->higher) | ||
165 | newblock->higher->lower = newblock; | ||
166 | } | ||
167 | |||
168 | newblock->info = newsize | INFO_FREE; /* we do assume size isn't using the | ||
169 | FREE bit */ | ||
170 | insert_bysize((char *)newblock+sizeof(struct BlockInfo), newsize); | ||
171 | } | ||
172 | |||
173 | /*********************************************************************** | ||
174 | * | ||
175 | * findblockbyaddr() | ||
176 | * | ||
177 | * Find the block that is just before the input block in memory. Returns NULL | ||
178 | * if none is. | ||
179 | * | ||
180 | ***********************************************************************/ | ||
181 | |||
182 | static struct BlockInfo *findblockbyaddr(struct BlockInfo *block) | ||
183 | { | ||
184 | struct BlockInfo *test = blockHead; | ||
185 | struct BlockInfo *lower = NULL; | ||
186 | |||
187 | while(test && (test < block)) { | ||
188 | lower = test; | ||
189 | test = test->higher; | ||
190 | } | ||
191 | return lower; | ||
192 | } | ||
193 | |||
194 | /*********************************************************************** | ||
195 | * | ||
196 | * add_pool() | ||
197 | * | ||
198 | * This function should be the absolutely first function to call. It sets up | ||
199 | * the memory bounds of the [first] CHUNK(s). It should be possible to call | ||
200 | * this function several times to add more CHUNKs to the pool of free | ||
201 | * memory. This allows the bmalloc system to deal with a non-contigous memory | ||
202 | * area. | ||
203 | * | ||
204 | * Returns non-zero if an error occured. The memory was not added then. | ||
205 | * | ||
206 | ***********************************************************************/ | ||
207 | |||
208 | int add_pool(void *start, | ||
209 | size_t size) | ||
210 | { | ||
211 | struct BlockInfo *newblock = (struct BlockInfo *)start; | ||
212 | struct BlockInfo *block; | ||
213 | |||
214 | if(size < BMEM_ALIGN) | ||
215 | return BMEMERR_TOOSMALL; | ||
216 | |||
217 | block = findblockbyaddr( newblock ); | ||
218 | /* `block' is now a lower address than 'newblock' or NULL */ | ||
219 | |||
220 | if(size&1) | ||
221 | size--; /* only add even sizes */ | ||
222 | |||
223 | add_blocktolists(block, newblock, size); | ||
224 | |||
225 | return 0; | ||
226 | } | ||
227 | |||
228 | |||
229 | #ifdef DEBUG | ||
230 | static void bmalloc_failed(size_t size) | ||
231 | { | ||
232 | printf("*** " __FILE__ " Couldn't allocate %d bytes\n", size); | ||
233 | print_lists(); | ||
234 | } | ||
235 | #else | ||
236 | #define bmalloc_failed(x) | ||
237 | #endif | ||
238 | |||
239 | void print_lists() | ||
240 | { | ||
241 | struct BlockInfo *block = blockHead; | ||
242 | #if 1 | ||
243 | printf("List of BLOCKS (in address order):\n"); | ||
244 | while(block) { | ||
245 | printf(" START %p END %p SIZE %ld FLAG %s\n", | ||
246 | (char *)block, | ||
247 | (char *)block+(block->info&INFO_SIZE), block->info&INFO_SIZE, | ||
248 | (block->info&INFO_FREE)?"free":"used"); | ||
249 | block = block->higher; | ||
250 | } | ||
251 | printf("End of BLOCKS:\n"); | ||
252 | #endif | ||
253 | print_sizes(); | ||
254 | } | ||
255 | |||
256 | void *bmalloc(size_t size) | ||
257 | { | ||
258 | void *mem; | ||
259 | |||
260 | #ifdef DEBUG | ||
261 | { | ||
262 | static int count=0; | ||
263 | int realsize = size + sizeof(struct BlockInfo); | ||
264 | if(realsize%4096) | ||
265 | realsize = ((size / BMEM_ALIGN)+1) * BMEM_ALIGN; | ||
266 | printf("%d bmalloc(%d) [%d]\n", count++, size, realsize); | ||
267 | } | ||
268 | #endif | ||
269 | |||
270 | size += sizeof(struct BlockInfo); /* add memory for our header */ | ||
271 | |||
272 | if(size&(BMEM_ALIGN-1)) /* a lot faster than %BMEM_ALIGN but this MUST be | ||
273 | changed if the BLOCKSIZE is not 2^X ! */ | ||
274 | size = ((size / BMEM_ALIGN)+1) * BMEM_ALIGN; /* align like this */ | ||
275 | |||
276 | /* get a CHUNK from the list with this size */ | ||
277 | mem = obtainbysize ( size ); | ||
278 | if(mem) { | ||
279 | /* the memory block we have got is the "best-fit" and it is already | ||
280 | un-linked from the free list */ | ||
281 | |||
282 | /* now do the math to get the proper block pointer */ | ||
283 | struct BlockInfo *block= (struct BlockInfo *) | ||
284 | ((char *)mem - sizeof(struct BlockInfo)); | ||
285 | |||
286 | block->info &= ~INFO_FREE; | ||
287 | /* not free anymore */ | ||
288 | |||
289 | if( size != (block->info&INFO_SIZE)) { | ||
290 | /* split this chunk into two pieces and return the one that fits us */ | ||
291 | size_t othersize = (block->info&INFO_SIZE) - size; | ||
292 | |||
293 | if(othersize > BMEM_ALIGN) { | ||
294 | /* prevent losing small pieces of memory due to weird alignments | ||
295 | of the memory pool */ | ||
296 | |||
297 | block->info = size; /* set new size (leave FREE bit cleared) */ | ||
298 | |||
299 | /* Add the new chunk to the lists: */ | ||
300 | add_blocktolists(block, | ||
301 | (struct BlockInfo *)((char *)block + size), | ||
302 | othersize ); | ||
303 | } | ||
304 | } | ||
305 | |||
306 | /* Return the memory our parent may use: */ | ||
307 | return (char *)block+sizeof(struct BlockInfo); | ||
308 | } | ||
309 | else { | ||
310 | bmalloc_failed(size); | ||
311 | return NULL; /* can't find any memory, fail hard */ | ||
312 | } | ||
313 | return NULL; | ||
314 | } | ||
315 | |||
316 | void bfree(void *ptr) | ||
317 | { | ||
318 | struct BlockInfo *block = (struct BlockInfo *) | ||
319 | ((char *)ptr - sizeof(struct BlockInfo)); | ||
320 | size_t size; | ||
321 | |||
322 | /* setup our initial higher and lower pointers */ | ||
323 | struct BlockInfo *lower = block->lower; | ||
324 | struct BlockInfo *higher = block->higher; | ||
325 | |||
326 | #ifdef DEBUG | ||
327 | static int freecount=0; | ||
328 | printf("%d bfree(%p)\n", freecount++, ptr); | ||
329 | #endif | ||
330 | |||
331 | /* bind together lower addressed FREE CHUNKS */ | ||
332 | if(lower && (lower->info&INFO_FREE) && | ||
333 | ((char *)lower + (lower->info&INFO_SIZE) == (char *)block)) { | ||
334 | size = block->info&INFO_SIZE; /* original size */ | ||
335 | |||
336 | /* remove from size-link: */ | ||
337 | remove_chunksize((char *)lower+sizeof(struct BlockInfo)); | ||
338 | |||
339 | remove_block(block); /* unlink from address list */ | ||
340 | block = lower; /* new base area pointer */ | ||
341 | block->info += size; /* append the new size (the FREE bit | ||
342 | will remain untouched) */ | ||
343 | |||
344 | lower = lower->lower; /* new lower pointer */ | ||
345 | } | ||
346 | /* bind together higher addressed FREE CHUNKS */ | ||
347 | if(higher && (higher->info&INFO_FREE) && | ||
348 | ((char *)block + (block->info&INFO_SIZE) == (char *)higher)) { | ||
349 | /* append higher size, the FREE bit won't be affected */ | ||
350 | block->info += (higher->info&INFO_SIZE); | ||
351 | |||
352 | /* unlink from size list: */ | ||
353 | remove_chunksize((char *)higher+sizeof(struct BlockInfo)); | ||
354 | remove_block(higher); /* unlink from address list */ | ||
355 | higher = higher->higher; /* the new higher link */ | ||
356 | block->higher = higher; /* new higher link */ | ||
357 | } | ||
358 | block->info |= INFO_FREE; /* consider this FREE! */ | ||
359 | |||
360 | block->lower = lower; | ||
361 | block->higher = higher; | ||
362 | |||
363 | insert_bysize((char *)block+sizeof(struct BlockInfo), block->info&INFO_SIZE); | ||
364 | |||
365 | #ifdef DEBUG | ||
366 | print_lists(); | ||
367 | #endif | ||
368 | |||
369 | } | ||
370 | |||
371 | /***************************************************************************** | ||
372 | * | ||
373 | * Big (best-fit) Memory Allocation | ||
374 | * | ||
375 | * Author: Daniel Stenberg | ||
376 | * Date: March 5, 1997 | ||
377 | * Version: 2.0 | ||
378 | * Email: Daniel.Stenberg@sth.frontec.se | ||
379 | * | ||
380 | * | ||
381 | * Read 'thoughts' for theories and details in implementation. | ||
382 | * | ||
383 | * Routines meant to replace the most low level functions of an Operting | ||
384 | * System | ||
385 | * | ||
386 | * v2.0 | ||
387 | * - Made all size-routines get moved out from this file. This way, the size | ||
388 | * functions can much more easily get replaced. | ||
389 | * - Improved how new memory blocks get added to the size-sorted list. When | ||
390 | * not adding new pools, there should never ever be any list traversing | ||
391 | * since all information is dynamically gathered. | ||
392 | * | ||
393 | ****************************************************************************/ | ||
394 | |||
395 | #include <stdio.h> | ||
396 | #include <stdlib.h> | ||
397 | |||
398 | #include "bysize.h" | ||
399 | |||
400 | #ifndef TRUE | ||
401 | #define TRUE 1 | ||
402 | #endif | ||
403 | #ifndef FALSE | ||
404 | #define FALSE 0 | ||
405 | #endif | ||
406 | |||
407 | /* #define DEBUG */ | ||
408 | |||
409 | #define BMEM_ALIGN 64 /* resolution */ | ||
410 | |||
411 | #define BMEMERR_TOOSMALL -1 | ||
412 | |||
413 | /* this struct will be stored in all CHUNKS and AREAS */ | ||
414 | struct BlockInfo { | ||
415 | struct BlockInfo *lower; /* previous block in memory (lower address) */ | ||
416 | struct BlockInfo *higher; /* next block in memory (higher address) */ | ||
417 | unsigned long info; /* 31 bits size: 1 bit free boolean */ | ||
418 | #define INFO_FREE 1 | ||
419 | #define INFO_SIZE (~ INFO_FREE) /* inverted FREE bit pattern */ | ||
420 | |||
421 | /* FREE+SIZE Could be written to use ordinary bitfields if using a smart | ||
422 | (like gcc) compiler in a manner like: | ||
423 | int size:31; | ||
424 | int free:1; | ||
425 | |||
426 | The 'higher' pointer COULD be removed completely if the size is used as | ||
427 | an index to the higher one. This would then REQUIRE the entire memory | ||
428 | pool to be contiguous and it needs a 'terminating' "node" or an extra | ||
429 | flag that informs about the end of the list. | ||
430 | */ | ||
431 | }; | ||
432 | |||
433 | /* the BLOCK list should be sorted in a lower to higher address order */ | ||
434 | struct BlockInfo *blockHead=NULL; /* nothing from the start */ | ||
435 | |||
436 | void print_lists(void); | ||
437 | |||
438 | |||
439 | /*********************************************************************** | ||
440 | * | ||
441 | * remove_block() | ||
442 | * | ||
443 | * Remove the block from the address-sorted list. | ||
444 | * | ||
445 | ***********************************************************************/ | ||
446 | |||
447 | void remove_block(struct BlockInfo *block) | ||
448 | { | ||
449 | if(block->lower) | ||
450 | block->lower->higher = block->higher; | ||
451 | else | ||
452 | blockHead = block->higher; | ||
453 | if(block->higher) | ||
454 | block->higher->lower = block->lower; | ||
455 | } | ||
456 | |||
457 | /**************************************************************************** | ||
458 | * | ||
459 | * add_blocktolists() | ||
460 | * | ||
461 | * Adds the specified block at the specified place in the address-sorted | ||
462 | * list and at the appropriate place in the size-sorted. | ||
463 | * | ||
464 | ***************************************************************************/ | ||
465 | void add_blocktolists(struct BlockInfo *block, | ||
466 | struct BlockInfo *newblock, | ||
467 | size_t newsize) | ||
468 | { | ||
469 | struct BlockInfo *temp; /* temporary storage variable */ | ||
470 | if(block) { | ||
471 | /* `block' is now a lower address than 'newblock' */ | ||
472 | |||
473 | /* | ||
474 | * Check if the new CHUNK is wall-to-wall with the lower addressed | ||
475 | * one (if *that* is free) | ||
476 | */ | ||
477 | if(block->info&INFO_FREE) { | ||
478 | if((char *)block + (block->info&INFO_SIZE) == (char *)newblock) { | ||
479 | /* yes sir, this is our lower address neighbour, enlarge that one | ||
480 | pick it out from the list and recursively add that chunk and | ||
481 | then we escape */ | ||
482 | |||
483 | /* remove from size-sorted list: */ | ||
484 | remove_chunksize((char*)block+sizeof(struct BlockInfo)); | ||
485 | |||
486 | block->info += newsize; /* newsize is an even number and thus the FREE | ||
487 | bit is untouched */ | ||
488 | |||
489 | remove_block(block); /* unlink the block address-wise */ | ||
490 | |||
491 | /* recursively check our lower friend(s) */ | ||
492 | add_blocktolists(block->lower, block, block->info&INFO_SIZE); | ||
493 | return; | ||
494 | } | ||
495 | } | ||
496 | |||
497 | temp = block->higher; | ||
498 | |||
499 | block->higher = newblock; | ||
500 | newblock->lower = block; | ||
501 | newblock->higher = temp; | ||
502 | if(newblock->higher) | ||
503 | newblock->higher->lower = newblock; | ||
504 | } | ||
505 | else { | ||
506 | /* this block should preceed the heading one */ | ||
507 | temp = blockHead; | ||
508 | |||
509 | /* check if this is our higher addressed neighbour */ | ||
510 | if((char *)newblock + newsize == (char *)temp) { | ||
511 | |||
512 | /* yes, we are wall-to-wall with the higher CHUNK */ | ||
513 | if(temp->info&INFO_FREE) { | ||
514 | /* and the neighbour is even free, remove that one and enlarge | ||
515 | ourselves, call add_pool() recursively and then escape */ | ||
516 | |||
517 | remove_block(temp); /* unlink 'temp' from list */ | ||
518 | |||
519 | /* remove from size-sorted list: */ | ||
520 | remove_chunksize((char*)temp+sizeof(struct BlockInfo) ); | ||
521 | |||
522 | /* add the upper block's size on ourselves */ | ||
523 | newsize += temp->info&INFO_SIZE; | ||
524 | |||
525 | /* add the new, bigger block */ | ||
526 | add_blocktolists(block, newblock, newsize); | ||
527 | return; | ||
528 | } | ||
529 | } | ||
530 | |||
531 | blockHead = newblock; | ||
532 | newblock->higher = temp; | ||
533 | newblock->lower = NULL; /* there is no lower one */ | ||
534 | if(newblock->higher) | ||
535 | newblock->higher->lower = newblock; | ||
536 | } | ||
537 | |||
538 | newblock->info = newsize | INFO_FREE; /* we do assume size isn't using the | ||
539 | FREE bit */ | ||
540 | insert_bysize((char *)newblock+sizeof(struct BlockInfo), newsize); | ||
541 | } | ||
542 | |||
543 | /*********************************************************************** | ||
544 | * | ||
545 | * findblockbyaddr() | ||
546 | * | ||
547 | * Find the block that is just before the input block in memory. Returns NULL | ||
548 | * if none is. | ||
549 | * | ||
550 | ***********************************************************************/ | ||
551 | |||
552 | static struct BlockInfo *findblockbyaddr(struct BlockInfo *block) | ||
553 | { | ||
554 | struct BlockInfo *test = blockHead; | ||
555 | struct BlockInfo *lower = NULL; | ||
556 | |||
557 | while(test && (test < block)) { | ||
558 | lower = test; | ||
559 | test = test->higher; | ||
560 | } | ||
561 | return lower; | ||
562 | } | ||
563 | |||
564 | /*********************************************************************** | ||
565 | * | ||
566 | * add_pool() | ||
567 | * | ||
568 | * This function should be the absolutely first function to call. It sets up | ||
569 | * the memory bounds of the [first] CHUNK(s). It should be possible to call | ||
570 | * this function several times to add more CHUNKs to the pool of free | ||
571 | * memory. This allows the bmalloc system to deal with a non-contigous memory | ||
572 | * area. | ||
573 | * | ||
574 | * Returns non-zero if an error occured. The memory was not added then. | ||
575 | * | ||
576 | ***********************************************************************/ | ||
577 | |||
578 | int add_pool(void *start, | ||
579 | size_t size) | ||
580 | { | ||
581 | struct BlockInfo *newblock = (struct BlockInfo *)start; | ||
582 | struct BlockInfo *block; | ||
583 | |||
584 | if(size < BMEM_ALIGN) | ||
585 | return BMEMERR_TOOSMALL; | ||
586 | |||
587 | block = findblockbyaddr( newblock ); | ||
588 | /* `block' is now a lower address than 'newblock' or NULL */ | ||
589 | |||
590 | if(size&1) | ||
591 | size--; /* only add even sizes */ | ||
592 | |||
593 | add_blocktolists(block, newblock, size); | ||
594 | |||
595 | return 0; | ||
596 | } | ||
597 | |||
598 | |||
599 | #ifdef DEBUG | ||
600 | static void bmalloc_failed(size_t size) | ||
601 | { | ||
602 | printf("*** " __FILE__ " Couldn't allocate %d bytes\n", size); | ||
603 | print_lists(); | ||
604 | } | ||
605 | #else | ||
606 | #define bmalloc_failed(x) | ||
607 | #endif | ||
608 | |||
609 | void print_lists() | ||
610 | { | ||
611 | struct BlockInfo *block = blockHead; | ||
612 | #if 1 | ||
613 | printf("List of BLOCKS (in address order):\n"); | ||
614 | while(block) { | ||
615 | printf(" START %p END %p SIZE %ld FLAG %s\n", | ||
616 | (char *)block, | ||
617 | (char *)block+(block->info&INFO_SIZE), block->info&INFO_SIZE, | ||
618 | (block->info&INFO_FREE)?"free":"used"); | ||
619 | block = block->higher; | ||
620 | } | ||
621 | printf("End of BLOCKS:\n"); | ||
622 | #endif | ||
623 | print_sizes(); | ||
624 | } | ||
625 | |||
626 | void *bmalloc(size_t size) | ||
627 | { | ||
628 | void *mem; | ||
629 | |||
630 | #ifdef DEBUG | ||
631 | { | ||
632 | static int count=0; | ||
633 | int realsize = size + sizeof(struct BlockInfo); | ||
634 | if(realsize%4096) | ||
635 | realsize = ((size / BMEM_ALIGN)+1) * BMEM_ALIGN; | ||
636 | printf("%d bmalloc(%d) [%d]\n", count++, size, realsize); | ||
637 | } | ||
638 | #endif | ||
639 | |||
640 | size += sizeof(struct BlockInfo); /* add memory for our header */ | ||
641 | |||
642 | if(size&(BMEM_ALIGN-1)) /* a lot faster than %BMEM_ALIGN but this MUST be | ||
643 | changed if the BLOCKSIZE is not 2^X ! */ | ||
644 | size = ((size / BMEM_ALIGN)+1) * BMEM_ALIGN; /* align like this */ | ||
645 | |||
646 | /* get a CHUNK from the list with this size */ | ||
647 | mem = obtainbysize ( size ); | ||
648 | if(mem) { | ||
649 | /* the memory block we have got is the "best-fit" and it is already | ||
650 | un-linked from the free list */ | ||
651 | |||
652 | /* now do the math to get the proper block pointer */ | ||
653 | struct BlockInfo *block= (struct BlockInfo *) | ||
654 | ((char *)mem - sizeof(struct BlockInfo)); | ||
655 | |||
656 | block->info &= ~INFO_FREE; | ||
657 | /* not free anymore */ | ||
658 | |||
659 | if( size != (block->info&INFO_SIZE)) { | ||
660 | /* split this chunk into two pieces and return the one that fits us */ | ||
661 | size_t othersize = (block->info&INFO_SIZE) - size; | ||
662 | |||
663 | if(othersize > BMEM_ALIGN) { | ||
664 | /* prevent losing small pieces of memory due to weird alignments | ||
665 | of the memory pool */ | ||
666 | |||
667 | block->info = size; /* set new size (leave FREE bit cleared) */ | ||
668 | |||
669 | /* Add the new chunk to the lists: */ | ||
670 | add_blocktolists(block, | ||
671 | (struct BlockInfo *)((char *)block + size), | ||
672 | othersize ); | ||
673 | } | ||
674 | } | ||
675 | |||
676 | /* Return the memory our parent may use: */ | ||
677 | return (char *)block+sizeof(struct BlockInfo); | ||
678 | } | ||
679 | else { | ||
680 | bmalloc_failed(size); | ||
681 | return NULL; /* can't find any memory, fail hard */ | ||
682 | } | ||
683 | return NULL; | ||
684 | } | ||
685 | |||
686 | void bfree(void *ptr) | ||
687 | { | ||
688 | struct BlockInfo *block = (struct BlockInfo *) | ||
689 | ((char *)ptr - sizeof(struct BlockInfo)); | ||
690 | size_t size; | ||
691 | |||
692 | /* setup our initial higher and lower pointers */ | ||
693 | struct BlockInfo *lower = block->lower; | ||
694 | struct BlockInfo *higher = block->higher; | ||
695 | |||
696 | #ifdef DEBUG | ||
697 | static int freecount=0; | ||
698 | printf("%d bfree(%p)\n", freecount++, ptr); | ||
699 | #endif | ||
700 | |||
701 | /* bind together lower addressed FREE CHUNKS */ | ||
702 | if(lower && (lower->info&INFO_FREE) && | ||
703 | ((char *)lower + (lower->info&INFO_SIZE) == (char *)block)) { | ||
704 | size = block->info&INFO_SIZE; /* original size */ | ||
705 | |||
706 | /* remove from size-link: */ | ||
707 | remove_chunksize((char *)lower+sizeof(struct BlockInfo)); | ||
708 | |||
709 | remove_block(block); /* unlink from address list */ | ||
710 | block = lower; /* new base area pointer */ | ||
711 | block->info += size; /* append the new size (the FREE bit | ||
712 | will remain untouched) */ | ||
713 | |||
714 | lower = lower->lower; /* new lower pointer */ | ||
715 | } | ||
716 | /* bind together higher addressed FREE CHUNKS */ | ||
717 | if(higher && (higher->info&INFO_FREE) && | ||
718 | ((char *)block + (block->info&INFO_SIZE) == (char *)higher)) { | ||
719 | /* append higher size, the FREE bit won't be affected */ | ||
720 | block->info += (higher->info&INFO_SIZE); | ||
721 | |||
722 | /* unlink from size list: */ | ||
723 | remove_chunksize((char *)higher+sizeof(struct BlockInfo)); | ||
724 | remove_block(higher); /* unlink from address list */ | ||
725 | higher = higher->higher; /* the new higher link */ | ||
726 | block->higher = higher; /* new higher link */ | ||
727 | } | ||
728 | block->info |= INFO_FREE; /* consider this FREE! */ | ||
729 | |||
730 | block->lower = lower; | ||
731 | block->higher = higher; | ||
732 | |||
733 | insert_bysize((char *)block+sizeof(struct BlockInfo), block->info&INFO_SIZE); | ||
734 | |||
735 | #ifdef DEBUG | ||
736 | print_lists(); | ||
737 | #endif | ||
738 | |||
739 | } | ||
740 | |||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/bmalloc.h b/apps/plugins/pdbox/dbestfit-3.3/bmalloc.h new file mode 100644 index 0000000000..4f77667290 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/bmalloc.h | |||
@@ -0,0 +1,12 @@ | |||
1 | int add_pool(void *start, size_t size); | ||
2 | void print_lists(); | ||
3 | |||
4 | void *bmalloc(size_t size); | ||
5 | void bfree(void *ptr); | ||
6 | |||
7 | int add_pool(void *start, size_t size); | ||
8 | void print_lists(); | ||
9 | |||
10 | void *bmalloc(size_t size); | ||
11 | void bfree(void *ptr); | ||
12 | |||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/bysize.c b/apps/plugins/pdbox/dbestfit-3.3/bysize.c new file mode 100644 index 0000000000..6808406dbc --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/bysize.c | |||
@@ -0,0 +1,848 @@ | |||
1 | /***************************************************************************** | ||
2 | * | ||
3 | * Size-sorted list/tree functions. | ||
4 | * | ||
5 | * Author: Daniel Stenberg | ||
6 | * Date: March 7, 1997 | ||
7 | * Version: 2.0 | ||
8 | * Email: Daniel.Stenberg@sth.frontec.se | ||
9 | * | ||
10 | * | ||
11 | * v2.0 | ||
12 | * - Added SPLAY TREE functionality. | ||
13 | * | ||
14 | * Adds and removes CHUNKS from a list or tree. | ||
15 | * | ||
16 | ****************************************************************************/ | ||
17 | |||
18 | #include <stdio.h> | ||
19 | #include <stdlib.h> | ||
20 | |||
21 | #define SPLAY /* we use the splay version as that is much faster */ | ||
22 | |||
23 | #ifndef TRUE | ||
24 | #define TRUE 1 | ||
25 | #endif | ||
26 | #ifndef FALSE | ||
27 | #define FALSE 0 | ||
28 | #endif | ||
29 | |||
30 | #ifndef SPLAY /* these routines are for the non-splay version */ | ||
31 | |||
32 | struct ChunkInfo { | ||
33 | struct ChunkInfo *larger; | ||
34 | struct ChunkInfo *smaller; | ||
35 | size_t size; | ||
36 | }; | ||
37 | |||
38 | /* the CHUNK list anchor */ | ||
39 | struct ChunkInfo *chunkHead=NULL; | ||
40 | |||
41 | /*********************************************************************** | ||
42 | |||
43 | findchunkbysize() | ||
44 | |||
45 | Find the chunk that is smaller than the input size. Returns | ||
46 | NULL if none is. | ||
47 | |||
48 | **********************************************************************/ | ||
49 | |||
50 | static struct ChunkInfo *findchunkbysize(size_t size) | ||
51 | { | ||
52 | struct ChunkInfo *test = chunkHead; | ||
53 | struct ChunkInfo *smaller = NULL; | ||
54 | while(test && (test->size < size)) { | ||
55 | smaller = test; | ||
56 | test = test->larger; | ||
57 | } | ||
58 | return smaller; | ||
59 | } | ||
60 | |||
61 | /*********************************************************************** | ||
62 | |||
63 | remove_chunksize() | ||
64 | |||
65 | Remove the chunk from the size-sorted list. | ||
66 | ***********************************************************************/ | ||
67 | |||
68 | void remove_chunksize(void *data) | ||
69 | { | ||
70 | struct ChunkInfo *chunk = (struct ChunkInfo *)data; | ||
71 | if(chunk->smaller) | ||
72 | chunk->smaller->larger = chunk->larger; | ||
73 | else { | ||
74 | /* if this has no smaller, this is the head */ | ||
75 | chunkHead = chunk->larger; /* new head */ | ||
76 | } | ||
77 | if(chunk->larger) | ||
78 | chunk->larger->smaller = chunk->smaller; | ||
79 | } | ||
80 | |||
81 | void insert_bysize(char *data, size_t size) | ||
82 | { | ||
83 | struct ChunkInfo *newchunk = (struct ChunkInfo *)data; | ||
84 | struct ChunkInfo *chunk = findchunkbysize ( size ); | ||
85 | |||
86 | newchunk->size = size; | ||
87 | |||
88 | if(chunk) { | ||
89 | /* 'chunk' is smaller than size, append the new chunk ahead of this */ | ||
90 | newchunk->smaller = chunk; | ||
91 | newchunk->larger = chunk->larger; | ||
92 | if(chunk->larger) | ||
93 | chunk->larger->smaller = newchunk; | ||
94 | chunk->larger = newchunk; | ||
95 | } | ||
96 | else { | ||
97 | /* smallest CHUNK around, append first in the list */ | ||
98 | newchunk->larger = chunkHead; | ||
99 | newchunk->smaller = NULL; | ||
100 | |||
101 | if(chunkHead) | ||
102 | chunkHead->smaller = newchunk; | ||
103 | chunkHead = newchunk; | ||
104 | } | ||
105 | } | ||
106 | |||
107 | char *obtainbysize( size_t size) | ||
108 | { | ||
109 | struct ChunkInfo *chunk = findchunkbysize( size ); | ||
110 | |||
111 | if(!chunk) { | ||
112 | if(size <= (chunkHead->size)) | ||
113 | /* there is no smaller CHUNK, use the first one (if we fit within that) | ||
114 | */ | ||
115 | chunk = chunkHead; | ||
116 | } | ||
117 | else | ||
118 | /* we're on the last CHUNK that is smaller than requested, step onto | ||
119 | the bigger one */ | ||
120 | chunk = chunk->larger; | ||
121 | |||
122 | if(chunk) { | ||
123 | remove_chunksize( chunk ); /* unlink size-wise */ | ||
124 | return (char *)chunk; | ||
125 | } | ||
126 | else | ||
127 | return NULL; | ||
128 | } | ||
129 | |||
130 | void print_sizes(void) | ||
131 | { | ||
132 | struct ChunkInfo *chunk = chunkHead; | ||
133 | printf("List of CHUNKS (in size order):\n"); | ||
134 | #if 1 | ||
135 | while(chunk) { | ||
136 | printf(" START %p END %p SIZE %d\n", | ||
137 | chunk, (char *)chunk+chunk->size, chunk->size); | ||
138 | chunk = chunk->larger; | ||
139 | } | ||
140 | #endif | ||
141 | printf("End of CHUNKS:\n"); | ||
142 | } | ||
143 | |||
144 | #else /* Here follows all routines dealing with the SPLAY TREES */ | ||
145 | |||
146 | typedef struct tree_node Tree; | ||
147 | struct tree_node { | ||
148 | Tree *smaller; /* smaller node */ | ||
149 | Tree *larger; /* larger node */ | ||
150 | Tree *same; /* points to a node with identical key */ | ||
151 | int key; /* the "sort" key */ | ||
152 | }; | ||
153 | |||
154 | Tree *chunkHead = NULL; /* the root */ | ||
155 | |||
156 | #define compare(i,j) ((i)-(j)) | ||
157 | |||
158 | /* Set this to a key value that will *NEVER* appear otherwise */ | ||
159 | #define KEY_NOTUSED -1 | ||
160 | |||
161 | /* | ||
162 | * Splay using the key i (which may or may not be in the tree.) The starting | ||
163 | * root is t. Weight fields are maintained. | ||
164 | */ | ||
165 | Tree * splay (int i, Tree *t) | ||
166 | { | ||
167 | Tree N, *l, *r, *y; | ||
168 | int comp; | ||
169 | |||
170 | if (t == NULL) | ||
171 | return t; | ||
172 | N.smaller = N.larger = NULL; | ||
173 | l = r = &N; | ||
174 | |||
175 | for (;;) { | ||
176 | comp = compare(i, t->key); | ||
177 | if (comp < 0) { | ||
178 | if (t->smaller == NULL) | ||
179 | break; | ||
180 | if (compare(i, t->smaller->key) < 0) { | ||
181 | y = t->smaller; /* rotate smaller */ | ||
182 | t->smaller = y->larger; | ||
183 | y->larger = t; | ||
184 | |||
185 | t = y; | ||
186 | if (t->smaller == NULL) | ||
187 | break; | ||
188 | } | ||
189 | r->smaller = t; /* link smaller */ | ||
190 | r = t; | ||
191 | t = t->smaller; | ||
192 | } | ||
193 | else if (comp > 0) { | ||
194 | if (t->larger == NULL) | ||
195 | break; | ||
196 | if (compare(i, t->larger->key) > 0) { | ||
197 | y = t->larger; /* rotate larger */ | ||
198 | t->larger = y->smaller; | ||
199 | y->smaller = t; | ||
200 | t = y; | ||
201 | if (t->larger == NULL) | ||
202 | break; | ||
203 | } | ||
204 | l->larger = t; /* link larger */ | ||
205 | l = t; | ||
206 | t = t->larger; | ||
207 | } | ||
208 | else { | ||
209 | break; | ||
210 | } | ||
211 | } | ||
212 | |||
213 | l->larger = r->smaller = NULL; | ||
214 | |||
215 | l->larger = t->smaller; /* assemble */ | ||
216 | r->smaller = t->larger; | ||
217 | t->smaller = N.larger; | ||
218 | t->larger = N.smaller; | ||
219 | |||
220 | return t; | ||
221 | } | ||
222 | |||
223 | /* Insert key i into the tree t. Return a pointer to the resulting tree or | ||
224 | NULL if something went wrong. */ | ||
225 | Tree *insert(int i, Tree *t, Tree *new) | ||
226 | { | ||
227 | if (new == NULL) { | ||
228 | return t; | ||
229 | } | ||
230 | |||
231 | if (t != NULL) { | ||
232 | t = splay(i,t); | ||
233 | if (compare(i, t->key)==0) { | ||
234 | /* it already exists one of this size */ | ||
235 | |||
236 | new->same = t; | ||
237 | new->key = i; | ||
238 | new->smaller = t->smaller; | ||
239 | new->larger = t->larger; | ||
240 | |||
241 | t->smaller = new; | ||
242 | t->key = KEY_NOTUSED; | ||
243 | |||
244 | return new; /* new root node */ | ||
245 | } | ||
246 | } | ||
247 | |||
248 | if (t == NULL) { | ||
249 | new->smaller = new->larger = NULL; | ||
250 | } | ||
251 | else if (compare(i, t->key) < 0) { | ||
252 | new->smaller = t->smaller; | ||
253 | new->larger = t; | ||
254 | t->smaller = NULL; | ||
255 | } | ||
256 | else { | ||
257 | new->larger = t->larger; | ||
258 | new->smaller = t; | ||
259 | t->larger = NULL; | ||
260 | } | ||
261 | new->key = i; | ||
262 | |||
263 | new->same = NULL; /* no identical node (yet) */ | ||
264 | |||
265 | return new; | ||
266 | } | ||
267 | |||
268 | /* Finds and deletes the best-fit node from the tree. Return a pointer to the | ||
269 | resulting tree. best-fit means the smallest node that fits the requested | ||
270 | size. */ | ||
271 | Tree *removebestfit(int i, Tree *t, Tree **removed) | ||
272 | { | ||
273 | Tree *x; | ||
274 | |||
275 | if (t==NULL) | ||
276 | return NULL; | ||
277 | t = splay(i,t); | ||
278 | if(compare(i, t->key) > 0) { | ||
279 | /* too small node, try the larger chain */ | ||
280 | if(t->larger) | ||
281 | t=splay(t->larger->key, t); | ||
282 | else { | ||
283 | /* fail */ | ||
284 | *removed = NULL; | ||
285 | return t; | ||
286 | } | ||
287 | } | ||
288 | |||
289 | if (compare(i, t->key) <= 0) { /* found it */ | ||
290 | |||
291 | /* FIRST! Check if there is a list with identical sizes */ | ||
292 | x = t->same; | ||
293 | if(x) { | ||
294 | /* there is, pick one from the list */ | ||
295 | |||
296 | /* 'x' is the new root node */ | ||
297 | |||
298 | x->key = t->key; | ||
299 | x->larger = t->larger; | ||
300 | x->smaller = t->smaller; | ||
301 | *removed = t; | ||
302 | return x; /* new root */ | ||
303 | } | ||
304 | |||
305 | if (t->smaller == NULL) { | ||
306 | x = t->larger; | ||
307 | } | ||
308 | else { | ||
309 | x = splay(i, t->smaller); | ||
310 | x->larger = t->larger; | ||
311 | } | ||
312 | *removed = t; | ||
313 | |||
314 | return x; | ||
315 | } | ||
316 | else { | ||
317 | *removed = NULL; /* no match */ | ||
318 | return t; /* It wasn't there */ | ||
319 | } | ||
320 | } | ||
321 | |||
322 | |||
323 | /* Deletes the node we point out from the tree if it's there. Return a pointer | ||
324 | to the resulting tree. */ | ||
325 | Tree *removebyaddr(Tree *t, Tree *remove) | ||
326 | { | ||
327 | Tree *x; | ||
328 | |||
329 | if (!t || !remove) | ||
330 | return NULL; | ||
331 | |||
332 | if(KEY_NOTUSED == remove->key) { | ||
333 | /* just unlink ourselves nice and quickly: */ | ||
334 | remove->smaller->same = remove->same; | ||
335 | if(remove->same) | ||
336 | remove->same->smaller = remove->smaller; | ||
337 | /* voila, we're done! */ | ||
338 | return t; | ||
339 | } | ||
340 | |||
341 | t = splay(remove->key,t); | ||
342 | |||
343 | /* Check if there is a list with identical sizes */ | ||
344 | |||
345 | x = t->same; | ||
346 | if(x) { | ||
347 | /* 'x' is the new root node */ | ||
348 | |||
349 | x->key = t->key; | ||
350 | x->larger = t->larger; | ||
351 | x->smaller = t->smaller; | ||
352 | |||
353 | return x; /* new root */ | ||
354 | } | ||
355 | |||
356 | /* Remove the actualy root node: */ | ||
357 | |||
358 | if (t->smaller == NULL) { | ||
359 | x = t->larger; | ||
360 | } | ||
361 | else { | ||
362 | x = splay(remove->key, t->smaller); | ||
363 | x->larger = t->larger; | ||
364 | } | ||
365 | |||
366 | return x; | ||
367 | } | ||
368 | |||
369 | int printtree(Tree * t, int d, char output) | ||
370 | { | ||
371 | int distance=0; | ||
372 | Tree *node; | ||
373 | int i; | ||
374 | if (t == NULL) | ||
375 | return 0; | ||
376 | distance += printtree(t->larger, d+1, output); | ||
377 | for (i=0; i<d; i++) | ||
378 | if(output) | ||
379 | printf(" "); | ||
380 | |||
381 | if(output) { | ||
382 | printf("%d[%d]", t->key, i); | ||
383 | } | ||
384 | |||
385 | for(node = t->same; node; node = node->same) { | ||
386 | distance += i; /* this has the same "virtual" distance */ | ||
387 | |||
388 | if(output) | ||
389 | printf(" [+]"); | ||
390 | } | ||
391 | if(output) | ||
392 | puts(""); | ||
393 | |||
394 | distance += i; | ||
395 | distance += printtree(t->smaller, d+1, output); | ||
396 | return distance; | ||
397 | } | ||
398 | |||
399 | /* Here follow the look-alike interface so that the tree-function names are | ||
400 | the same as the list-ones to enable easy interchange */ | ||
401 | |||
402 | void remove_chunksize(void *data) | ||
403 | { | ||
404 | chunkHead = removebyaddr(chunkHead, data); | ||
405 | } | ||
406 | |||
407 | void insert_bysize(char *data, size_t size) | ||
408 | { | ||
409 | chunkHead = insert(size, chunkHead, (Tree *)data); | ||
410 | } | ||
411 | |||
412 | char *obtainbysize( size_t size) | ||
413 | { | ||
414 | Tree *receive; | ||
415 | chunkHead = removebestfit(size, chunkHead, &receive); | ||
416 | return (char *)receive; | ||
417 | } | ||
418 | |||
419 | void print_sizes(void) | ||
420 | { | ||
421 | printtree(chunkHead, 0, 1); | ||
422 | } | ||
423 | |||
424 | #endif | ||
425 | /***************************************************************************** | ||
426 | * | ||
427 | * Size-sorted list/tree functions. | ||
428 | * | ||
429 | * Author: Daniel Stenberg | ||
430 | * Date: March 7, 1997 | ||
431 | * Version: 2.0 | ||
432 | * Email: Daniel.Stenberg@sth.frontec.se | ||
433 | * | ||
434 | * | ||
435 | * v2.0 | ||
436 | * - Added SPLAY TREE functionality. | ||
437 | * | ||
438 | * Adds and removes CHUNKS from a list or tree. | ||
439 | * | ||
440 | ****************************************************************************/ | ||
441 | |||
442 | #include <stdio.h> | ||
443 | #include <stdlib.h> | ||
444 | |||
445 | #define SPLAY /* we use the splay version as that is much faster */ | ||
446 | |||
447 | #ifndef TRUE | ||
448 | #define TRUE 1 | ||
449 | #endif | ||
450 | #ifndef FALSE | ||
451 | #define FALSE 0 | ||
452 | #endif | ||
453 | |||
454 | #ifndef SPLAY /* these routines are for the non-splay version */ | ||
455 | |||
456 | struct ChunkInfo { | ||
457 | struct ChunkInfo *larger; | ||
458 | struct ChunkInfo *smaller; | ||
459 | size_t size; | ||
460 | }; | ||
461 | |||
462 | /* the CHUNK list anchor */ | ||
463 | struct ChunkInfo *chunkHead=NULL; | ||
464 | |||
465 | /*********************************************************************** | ||
466 | |||
467 | findchunkbysize() | ||
468 | |||
469 | Find the chunk that is smaller than the input size. Returns | ||
470 | NULL if none is. | ||
471 | |||
472 | **********************************************************************/ | ||
473 | |||
474 | static struct ChunkInfo *findchunkbysize(size_t size) | ||
475 | { | ||
476 | struct ChunkInfo *test = chunkHead; | ||
477 | struct ChunkInfo *smaller = NULL; | ||
478 | while(test && (test->size < size)) { | ||
479 | smaller = test; | ||
480 | test = test->larger; | ||
481 | } | ||
482 | return smaller; | ||
483 | } | ||
484 | |||
485 | /*********************************************************************** | ||
486 | |||
487 | remove_chunksize() | ||
488 | |||
489 | Remove the chunk from the size-sorted list. | ||
490 | ***********************************************************************/ | ||
491 | |||
492 | void remove_chunksize(void *data) | ||
493 | { | ||
494 | struct ChunkInfo *chunk = (struct ChunkInfo *)data; | ||
495 | if(chunk->smaller) | ||
496 | chunk->smaller->larger = chunk->larger; | ||
497 | else { | ||
498 | /* if this has no smaller, this is the head */ | ||
499 | chunkHead = chunk->larger; /* new head */ | ||
500 | } | ||
501 | if(chunk->larger) | ||
502 | chunk->larger->smaller = chunk->smaller; | ||
503 | } | ||
504 | |||
505 | void insert_bysize(char *data, size_t size) | ||
506 | { | ||
507 | struct ChunkInfo *newchunk = (struct ChunkInfo *)data; | ||
508 | struct ChunkInfo *chunk = findchunkbysize ( size ); | ||
509 | |||
510 | newchunk->size = size; | ||
511 | |||
512 | if(chunk) { | ||
513 | /* 'chunk' is smaller than size, append the new chunk ahead of this */ | ||
514 | newchunk->smaller = chunk; | ||
515 | newchunk->larger = chunk->larger; | ||
516 | if(chunk->larger) | ||
517 | chunk->larger->smaller = newchunk; | ||
518 | chunk->larger = newchunk; | ||
519 | } | ||
520 | else { | ||
521 | /* smallest CHUNK around, append first in the list */ | ||
522 | newchunk->larger = chunkHead; | ||
523 | newchunk->smaller = NULL; | ||
524 | |||
525 | if(chunkHead) | ||
526 | chunkHead->smaller = newchunk; | ||
527 | chunkHead = newchunk; | ||
528 | } | ||
529 | } | ||
530 | |||
531 | char *obtainbysize( size_t size) | ||
532 | { | ||
533 | struct ChunkInfo *chunk = findchunkbysize( size ); | ||
534 | |||
535 | if(!chunk) { | ||
536 | if(size <= (chunkHead->size)) | ||
537 | /* there is no smaller CHUNK, use the first one (if we fit within that) | ||
538 | */ | ||
539 | chunk = chunkHead; | ||
540 | } | ||
541 | else | ||
542 | /* we're on the last CHUNK that is smaller than requested, step onto | ||
543 | the bigger one */ | ||
544 | chunk = chunk->larger; | ||
545 | |||
546 | if(chunk) { | ||
547 | remove_chunksize( chunk ); /* unlink size-wise */ | ||
548 | return (char *)chunk; | ||
549 | } | ||
550 | else | ||
551 | return NULL; | ||
552 | } | ||
553 | |||
554 | void print_sizes(void) | ||
555 | { | ||
556 | struct ChunkInfo *chunk = chunkHead; | ||
557 | printf("List of CHUNKS (in size order):\n"); | ||
558 | #if 1 | ||
559 | while(chunk) { | ||
560 | printf(" START %p END %p SIZE %d\n", | ||
561 | chunk, (char *)chunk+chunk->size, chunk->size); | ||
562 | chunk = chunk->larger; | ||
563 | } | ||
564 | #endif | ||
565 | printf("End of CHUNKS:\n"); | ||
566 | } | ||
567 | |||
568 | #else /* Here follows all routines dealing with the SPLAY TREES */ | ||
569 | |||
570 | typedef struct tree_node Tree; | ||
571 | struct tree_node { | ||
572 | Tree *smaller; /* smaller node */ | ||
573 | Tree *larger; /* larger node */ | ||
574 | Tree *same; /* points to a node with identical key */ | ||
575 | int key; /* the "sort" key */ | ||
576 | }; | ||
577 | |||
578 | Tree *chunkHead = NULL; /* the root */ | ||
579 | |||
580 | #define compare(i,j) ((i)-(j)) | ||
581 | |||
582 | /* Set this to a key value that will *NEVER* appear otherwise */ | ||
583 | #define KEY_NOTUSED -1 | ||
584 | |||
585 | /* | ||
586 | * Splay using the key i (which may or may not be in the tree.) The starting | ||
587 | * root is t. Weight fields are maintained. | ||
588 | */ | ||
589 | Tree * splay (int i, Tree *t) | ||
590 | { | ||
591 | Tree N, *l, *r, *y; | ||
592 | int comp; | ||
593 | |||
594 | if (t == NULL) | ||
595 | return t; | ||
596 | N.smaller = N.larger = NULL; | ||
597 | l = r = &N; | ||
598 | |||
599 | for (;;) { | ||
600 | comp = compare(i, t->key); | ||
601 | if (comp < 0) { | ||
602 | if (t->smaller == NULL) | ||
603 | break; | ||
604 | if (compare(i, t->smaller->key) < 0) { | ||
605 | y = t->smaller; /* rotate smaller */ | ||
606 | t->smaller = y->larger; | ||
607 | y->larger = t; | ||
608 | |||
609 | t = y; | ||
610 | if (t->smaller == NULL) | ||
611 | break; | ||
612 | } | ||
613 | r->smaller = t; /* link smaller */ | ||
614 | r = t; | ||
615 | t = t->smaller; | ||
616 | } | ||
617 | else if (comp > 0) { | ||
618 | if (t->larger == NULL) | ||
619 | break; | ||
620 | if (compare(i, t->larger->key) > 0) { | ||
621 | y = t->larger; /* rotate larger */ | ||
622 | t->larger = y->smaller; | ||
623 | y->smaller = t; | ||
624 | t = y; | ||
625 | if (t->larger == NULL) | ||
626 | break; | ||
627 | } | ||
628 | l->larger = t; /* link larger */ | ||
629 | l = t; | ||
630 | t = t->larger; | ||
631 | } | ||
632 | else { | ||
633 | break; | ||
634 | } | ||
635 | } | ||
636 | |||
637 | l->larger = r->smaller = NULL; | ||
638 | |||
639 | l->larger = t->smaller; /* assemble */ | ||
640 | r->smaller = t->larger; | ||
641 | t->smaller = N.larger; | ||
642 | t->larger = N.smaller; | ||
643 | |||
644 | return t; | ||
645 | } | ||
646 | |||
647 | /* Insert key i into the tree t. Return a pointer to the resulting tree or | ||
648 | NULL if something went wrong. */ | ||
649 | Tree *insert(int i, Tree *t, Tree *new) | ||
650 | { | ||
651 | if (new == NULL) { | ||
652 | return t; | ||
653 | } | ||
654 | |||
655 | if (t != NULL) { | ||
656 | t = splay(i,t); | ||
657 | if (compare(i, t->key)==0) { | ||
658 | /* it already exists one of this size */ | ||
659 | |||
660 | new->same = t; | ||
661 | new->key = i; | ||
662 | new->smaller = t->smaller; | ||
663 | new->larger = t->larger; | ||
664 | |||
665 | t->smaller = new; | ||
666 | t->key = KEY_NOTUSED; | ||
667 | |||
668 | return new; /* new root node */ | ||
669 | } | ||
670 | } | ||
671 | |||
672 | if (t == NULL) { | ||
673 | new->smaller = new->larger = NULL; | ||
674 | } | ||
675 | else if (compare(i, t->key) < 0) { | ||
676 | new->smaller = t->smaller; | ||
677 | new->larger = t; | ||
678 | t->smaller = NULL; | ||
679 | } | ||
680 | else { | ||
681 | new->larger = t->larger; | ||
682 | new->smaller = t; | ||
683 | t->larger = NULL; | ||
684 | } | ||
685 | new->key = i; | ||
686 | |||
687 | new->same = NULL; /* no identical node (yet) */ | ||
688 | |||
689 | return new; | ||
690 | } | ||
691 | |||
692 | /* Finds and deletes the best-fit node from the tree. Return a pointer to the | ||
693 | resulting tree. best-fit means the smallest node that fits the requested | ||
694 | size. */ | ||
695 | Tree *removebestfit(int i, Tree *t, Tree **removed) | ||
696 | { | ||
697 | Tree *x; | ||
698 | |||
699 | if (t==NULL) | ||
700 | return NULL; | ||
701 | t = splay(i,t); | ||
702 | if(compare(i, t->key) > 0) { | ||
703 | /* too small node, try the larger chain */ | ||
704 | if(t->larger) | ||
705 | t=splay(t->larger->key, t); | ||
706 | else { | ||
707 | /* fail */ | ||
708 | *removed = NULL; | ||
709 | return t; | ||
710 | } | ||
711 | } | ||
712 | |||
713 | if (compare(i, t->key) <= 0) { /* found it */ | ||
714 | |||
715 | /* FIRST! Check if there is a list with identical sizes */ | ||
716 | x = t->same; | ||
717 | if(x) { | ||
718 | /* there is, pick one from the list */ | ||
719 | |||
720 | /* 'x' is the new root node */ | ||
721 | |||
722 | x->key = t->key; | ||
723 | x->larger = t->larger; | ||
724 | x->smaller = t->smaller; | ||
725 | *removed = t; | ||
726 | return x; /* new root */ | ||
727 | } | ||
728 | |||
729 | if (t->smaller == NULL) { | ||
730 | x = t->larger; | ||
731 | } | ||
732 | else { | ||
733 | x = splay(i, t->smaller); | ||
734 | x->larger = t->larger; | ||
735 | } | ||
736 | *removed = t; | ||
737 | |||
738 | return x; | ||
739 | } | ||
740 | else { | ||
741 | *removed = NULL; /* no match */ | ||
742 | return t; /* It wasn't there */ | ||
743 | } | ||
744 | } | ||
745 | |||
746 | |||
747 | /* Deletes the node we point out from the tree if it's there. Return a pointer | ||
748 | to the resulting tree. */ | ||
749 | Tree *removebyaddr(Tree *t, Tree *remove) | ||
750 | { | ||
751 | Tree *x; | ||
752 | |||
753 | if (!t || !remove) | ||
754 | return NULL; | ||
755 | |||
756 | if(KEY_NOTUSED == remove->key) { | ||
757 | /* just unlink ourselves nice and quickly: */ | ||
758 | remove->smaller->same = remove->same; | ||
759 | if(remove->same) | ||
760 | remove->same->smaller = remove->smaller; | ||
761 | /* voila, we're done! */ | ||
762 | return t; | ||
763 | } | ||
764 | |||
765 | t = splay(remove->key,t); | ||
766 | |||
767 | /* Check if there is a list with identical sizes */ | ||
768 | |||
769 | x = t->same; | ||
770 | if(x) { | ||
771 | /* 'x' is the new root node */ | ||
772 | |||
773 | x->key = t->key; | ||
774 | x->larger = t->larger; | ||
775 | x->smaller = t->smaller; | ||
776 | |||
777 | return x; /* new root */ | ||
778 | } | ||
779 | |||
780 | /* Remove the actualy root node: */ | ||
781 | |||
782 | if (t->smaller == NULL) { | ||
783 | x = t->larger; | ||
784 | } | ||
785 | else { | ||
786 | x = splay(remove->key, t->smaller); | ||
787 | x->larger = t->larger; | ||
788 | } | ||
789 | |||
790 | return x; | ||
791 | } | ||
792 | |||
793 | int printtree(Tree * t, int d, char output) | ||
794 | { | ||
795 | int distance=0; | ||
796 | Tree *node; | ||
797 | int i; | ||
798 | if (t == NULL) | ||
799 | return 0; | ||
800 | distance += printtree(t->larger, d+1, output); | ||
801 | for (i=0; i<d; i++) | ||
802 | if(output) | ||
803 | printf(" "); | ||
804 | |||
805 | if(output) { | ||
806 | printf("%d[%d]", t->key, i); | ||
807 | } | ||
808 | |||
809 | for(node = t->same; node; node = node->same) { | ||
810 | distance += i; /* this has the same "virtual" distance */ | ||
811 | |||
812 | if(output) | ||
813 | printf(" [+]"); | ||
814 | } | ||
815 | if(output) | ||
816 | puts(""); | ||
817 | |||
818 | distance += i; | ||
819 | distance += printtree(t->smaller, d+1, output); | ||
820 | return distance; | ||
821 | } | ||
822 | |||
823 | /* Here follow the look-alike interface so that the tree-function names are | ||
824 | the same as the list-ones to enable easy interchange */ | ||
825 | |||
826 | void remove_chunksize(void *data) | ||
827 | { | ||
828 | chunkHead = removebyaddr(chunkHead, data); | ||
829 | } | ||
830 | |||
831 | void insert_bysize(char *data, size_t size) | ||
832 | { | ||
833 | chunkHead = insert(size, chunkHead, (Tree *)data); | ||
834 | } | ||
835 | |||
836 | char *obtainbysize( size_t size) | ||
837 | { | ||
838 | Tree *receive; | ||
839 | chunkHead = removebestfit(size, chunkHead, &receive); | ||
840 | return (char *)receive; | ||
841 | } | ||
842 | |||
843 | void print_sizes(void) | ||
844 | { | ||
845 | printtree(chunkHead, 0, 1); | ||
846 | } | ||
847 | |||
848 | #endif | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/bysize.h b/apps/plugins/pdbox/dbestfit-3.3/bysize.h new file mode 100644 index 0000000000..2fbf23154d --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/bysize.h | |||
@@ -0,0 +1,8 @@ | |||
1 | void remove_chunksize(void *data); | ||
2 | void insert_bysize(char *data, size_t size); | ||
3 | char *obtainbysize( size_t size); | ||
4 | void print_sizes(void); | ||
5 | void remove_chunksize(void *data); | ||
6 | void insert_bysize(char *data, size_t size); | ||
7 | char *obtainbysize( size_t size); | ||
8 | void print_sizes(void); | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/dmalloc.c b/apps/plugins/pdbox/dbestfit-3.3/dmalloc.c new file mode 100644 index 0000000000..9336276883 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/dmalloc.c | |||
@@ -0,0 +1,1380 @@ | |||
1 | /***************************************************************************** | ||
2 | * | ||
3 | * Dynamic Memory Allocation | ||
4 | * | ||
5 | * Author: Daniel Stenberg | ||
6 | * Date: March 10, 1997 | ||
7 | * Version: 2.3 | ||
8 | * Email: Daniel.Stenberg@sth.frontec.se | ||
9 | * | ||
10 | * | ||
11 | * Read 'thoughts' for theories and details of this implementation. | ||
12 | * | ||
13 | * v2.1 | ||
14 | * - I once again managed to gain some memory. BLOCK allocations now only use | ||
15 | * a 4 bytes header (instead of previos 8) just as FRAGMENTS. | ||
16 | * | ||
17 | * v2.2 | ||
18 | * - Re-adjusted the fragment sizes to better fit into the somewhat larger | ||
19 | * block. | ||
20 | * | ||
21 | * v2.3 | ||
22 | * - Made realloc(NULL, size) work as it should. Which is like a malloc(size) | ||
23 | * | ||
24 | *****************************************************************************/ | ||
25 | |||
26 | #include <stdio.h> | ||
27 | #include <string.h> | ||
28 | |||
29 | #ifdef DEBUG | ||
30 | #include <stdarg.h> | ||
31 | #endif | ||
32 | |||
33 | #ifdef PSOS | ||
34 | #include <psos.h> | ||
35 | #define SEMAPHORE /* the PSOS routines use semaphore protection */ | ||
36 | #else | ||
37 | #include <stdlib.h> /* makes the PSOS complain on the 'size_t' typedef */ | ||
38 | #endif | ||
39 | |||
40 | #ifdef BMALLOC | ||
41 | #include "bmalloc.h" | ||
42 | #endif | ||
43 | |||
44 | /* Each TOP takes care of a chain of BLOCKS */ | ||
45 | struct MemTop { | ||
46 | struct MemBlock *chain; /* pointer to the BLOCK chain */ | ||
47 | long nfree; /* total number of free FRAGMENTS in the chain */ | ||
48 | short nmax; /* total number of FRAGMENTS in this kind of BLOCK */ | ||
49 | size_t fragsize; /* the size of each FRAGMENT */ | ||
50 | |||
51 | #ifdef SEMAPHORE /* if we're protecting the list with SEMAPHORES */ | ||
52 | long semaphore_id; /* semaphore used to lock this particular list */ | ||
53 | #endif | ||
54 | |||
55 | }; | ||
56 | |||
57 | /* Each BLOCK takes care of an amount of FRAGMENTS */ | ||
58 | struct MemBlock { | ||
59 | struct MemTop *top; /* our TOP struct */ | ||
60 | struct MemBlock *next; /* next BLOCK */ | ||
61 | struct MemBlock *prev; /* prev BLOCK */ | ||
62 | |||
63 | struct MemFrag *first; /* the first free FRAGMENT in this block */ | ||
64 | |||
65 | short nfree; /* number of free FRAGMENTS in this BLOCK */ | ||
66 | }; | ||
67 | |||
68 | /* This is the data kept in all _free_ FRAGMENTS */ | ||
69 | struct MemFrag { | ||
70 | struct MemFrag *next; /* next free FRAGMENT */ | ||
71 | struct MemFrag *prev; /* prev free FRAGMENT */ | ||
72 | }; | ||
73 | |||
74 | /* This is the data kept in all _allocated_ FRAGMENTS and BLOCKS. We add this | ||
75 | to the allocation size first thing in the ALLOC function to make room for | ||
76 | this smoothly. */ | ||
77 | |||
78 | struct MemInfo { | ||
79 | void *block; | ||
80 | /* which BLOCK is our father, if BLOCK_BIT is set it means this is a | ||
81 | stand-alone, large allocation and then the rest of the bits should be | ||
82 | treated as the size of the block */ | ||
83 | #define BLOCK_BIT 1 | ||
84 | }; | ||
85 | |||
86 | /* ---------------------------------------------------------------------- */ | ||
87 | /* Defines */ | ||
88 | /* ---------------------------------------------------------------------- */ | ||
89 | |||
90 | #ifdef DEBUG | ||
91 | #define MEMINCR(addr,x) memchange(addr, x) | ||
92 | #define MEMDECR(addr,x) memchange(addr,-(x)) | ||
93 | #else | ||
94 | #define MEMINCR(a,x) | ||
95 | #define MEMDECR(a,x) | ||
96 | #endif | ||
97 | |||
98 | /* The low level functions used to get memory from the OS and to return memory | ||
99 | to the OS, we may also define a stub that does the actual allocation and | ||
100 | free, these are the defined function names used in the dmalloc system | ||
101 | anyway: */ | ||
102 | #ifdef PSOS | ||
103 | |||
104 | #ifdef DEBUG | ||
105 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)dbgmalloc(size) | ||
106 | #define DMEM_OSFREEMEM(x) dbgfree(x) | ||
107 | #else | ||
108 | #define DMEM_OSALLOCMEM(size,pointer,type) rn_getseg(0,size,RN_NOWAIT,0,(void **)&pointer) | ||
109 | /* Similar, but this returns the memory */ | ||
110 | #define DMEM_OSFREEMEM(x) rn_retseg(0, x) | ||
111 | #endif | ||
112 | |||
113 | /* Argument: <id> */ | ||
114 | #define SEMAPHOREOBTAIN(x) sm_p(x, SM_WAIT, 0) | ||
115 | /* Argument: <id> */ | ||
116 | #define SEMAPHORERETURN(x) sm_v(x) | ||
117 | /* Argument: <name> <id-variable name> */ | ||
118 | #define SEMAPHORECREATE(x,y) sm_create(x, 1, SM_FIFO, (ULONG *)&(y)) | ||
119 | |||
120 | #else | ||
121 | #ifdef BMALLOC /* use our own big-memory-allocation system */ | ||
122 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)bmalloc(size) | ||
123 | #define DMEM_OSFREEMEM(x) bfree(x) | ||
124 | #elif DEBUG | ||
125 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)dbgmalloc(size) | ||
126 | #define DMEM_OSFREEMEM(x) dbgfree(x) | ||
127 | #else | ||
128 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)malloc(size) | ||
129 | #define DMEM_OSFREEMEM(x) free(x) | ||
130 | #endif | ||
131 | #endif | ||
132 | |||
133 | |||
134 | /* the largest memory allocation that is made a FRAGMENT: (grab the highest | ||
135 | number from the list below) */ | ||
136 | #define DMEM_LARGESTSIZE 2032 | ||
137 | |||
138 | /* The total size of a BLOCK used for FRAGMENTS | ||
139 | In order to make this use only *1* even alignment from the big-block- | ||
140 | allocation-system (possible the bmalloc() system also written by me) | ||
141 | we need to subtract the [maximum] struct sizes that could get added all | ||
142 | the way through to the grab from the memory. */ | ||
143 | #define DMEM_BLOCKSIZE 4064 /* (4096 - sizeof(struct MemBlock) - 12) */ | ||
144 | |||
145 | /* Since the blocksize isn't an even 2^X story anymore, we make a table with | ||
146 | the FRAGMENT sizes and amounts that fills up a BLOCK nicely */ | ||
147 | |||
148 | /* a little 'bc' script that helps us maximize the usage: | ||
149 | - for 32-bit aligned addresses (SPARC crashes otherwise): | ||
150 | for(i=20; i<2040; i++) { a=4064/i; if(a*i >= 4060) { if(i%4==0) {i;} } } | ||
151 | |||
152 | |||
153 | I try to approximate a double of each size, starting with ~20. We don't do | ||
154 | ODD sizes since several CPU flavours dump core when accessing such | ||
155 | addresses. We try to do 32-bit aligned to make ALL kinds of CPUs to remain | ||
156 | happy with us. | ||
157 | */ | ||
158 | |||
159 | #if BIGBLOCKS==4060 /* previously */ | ||
160 | short qinfo[]= { 20, 28, 52, 116, 312, 580, 812, 2028 }; | ||
161 | #else | ||
162 | short qinfo[]= { 20, 28, 52, 116, 312, 580, 1016, 2032}; | ||
163 | /* 52 and 312 only make use of 4056 bytes, but without them there are too | ||
164 | wide gaps */ | ||
165 | #endif | ||
166 | |||
167 | #define MIN(x,y) ((x)<(y)?(x):(y)) | ||
168 | |||
169 | /* ---------------------------------------------------------------------- */ | ||
170 | /* Globals */ | ||
171 | /* ---------------------------------------------------------------------- */ | ||
172 | |||
173 | /* keeper of the chain of BLOCKS */ | ||
174 | static struct MemTop top[ sizeof(qinfo)/sizeof(qinfo[0]) ]; | ||
175 | |||
176 | /* are we experienced? */ | ||
177 | static char initialized = 0; | ||
178 | |||
179 | /* ---------------------------------------------------------------------- */ | ||
180 | /* Start of the real code */ | ||
181 | /* ---------------------------------------------------------------------- */ | ||
182 | |||
183 | #ifdef DEBUG | ||
184 | /************ | ||
185 | * A few functions that are verbose and tells us about the current status | ||
186 | * of the dmalloc system | ||
187 | ***********/ | ||
188 | |||
189 | static void dmalloc_status() | ||
190 | { | ||
191 | int i; | ||
192 | int used; | ||
193 | int num; | ||
194 | int totalfree=0; | ||
195 | struct MemBlock *block; | ||
196 | for(i=0; i<sizeof(qinfo)/sizeof(qinfo[0]);i++) { | ||
197 | block = top[i].chain; | ||
198 | used = 0; | ||
199 | num = 0; | ||
200 | while(block) { | ||
201 | used += top[i].nmax-block->nfree; | ||
202 | num++; | ||
203 | block = block->next; | ||
204 | } | ||
205 | printf("Q %d (FRAG %4d), USED %4d FREE %4ld (SIZE %4ld) BLOCKS %d\n", | ||
206 | i, top[i].fragsize, used, top[i].nfree, | ||
207 | top[i].nfree*top[i].fragsize, num); | ||
208 | totalfree += top[i].nfree*top[i].fragsize; | ||
209 | } | ||
210 | printf("Total unused memory stolen by dmalloc: %d\n", totalfree); | ||
211 | } | ||
212 | |||
213 | static void dmalloc_failed(size_t size) | ||
214 | { | ||
215 | printf("*** " __FILE__ " Couldn't allocate %d bytes\n", size); | ||
216 | dmalloc_status(); | ||
217 | } | ||
218 | #else | ||
219 | #define dmalloc_failed(x) | ||
220 | #endif | ||
221 | |||
222 | #ifdef DEBUG | ||
223 | |||
224 | #define BORDER 1200 | ||
225 | |||
226 | void *dbgmalloc(int size) | ||
227 | { | ||
228 | char *mem; | ||
229 | size += BORDER; | ||
230 | #ifdef PSOS | ||
231 | rn_getseg(0,size,RN_NOWAIT,0,(void **)&mem); | ||
232 | #else | ||
233 | mem = malloc(size); | ||
234 | #endif | ||
235 | if(mem) { | ||
236 | memset(mem, 0xaa, BORDER/2); | ||
237 | memset(mem+BORDER/2, 0xbb, size -BORDER); | ||
238 | memset(mem-BORDER/2+size, 0xcc, BORDER/2); | ||
239 | *(long *)mem = size; | ||
240 | mem += (BORDER/2); | ||
241 | } | ||
242 | printf("OSmalloc(%p)\n", mem); | ||
243 | return (void *)mem; | ||
244 | } | ||
245 | |||
246 | void checkmem(char *ptr) | ||
247 | { | ||
248 | int i; | ||
249 | long size; | ||
250 | ptr -= BORDER/2; | ||
251 | |||
252 | for(i=4; i<(BORDER/2); i++) | ||
253 | if((unsigned char)ptr[i] != 0xaa) { | ||
254 | printf("########### ALERT ALERT\n"); | ||
255 | break; | ||
256 | } | ||
257 | size = *(long *)ptr; | ||
258 | for(i=size-1; i>=(size - BORDER/2); i--) | ||
259 | if((unsigned char)ptr[i] != 0xcc) { | ||
260 | printf("********* POST ALERT\n"); | ||
261 | break; | ||
262 | } | ||
263 | } | ||
264 | |||
265 | void dbgfree(char *ptr) | ||
266 | { | ||
267 | long size; | ||
268 | checkmem(ptr); | ||
269 | ptr -= BORDER/2; | ||
270 | size = *(long *)ptr; | ||
271 | |||
272 | printf("OSfree(%ld)\n", size); | ||
273 | #ifdef PSOS | ||
274 | rn_retseg(0, ptr); | ||
275 | #else | ||
276 | free(ptr); | ||
277 | #endif | ||
278 | } | ||
279 | |||
280 | |||
281 | #define DBG(x) syslog x | ||
282 | |||
283 | void syslog(char *fmt, ...) | ||
284 | { | ||
285 | va_list ap; | ||
286 | va_start(ap, fmt); | ||
287 | vfprintf(stdout, fmt, ap); | ||
288 | va_end(ap); | ||
289 | } | ||
290 | |||
291 | void memchange(void *a, int x) | ||
292 | { | ||
293 | static int memory=0; | ||
294 | static int count=0; | ||
295 | static int max=0; | ||
296 | if(memory > max) | ||
297 | max = memory; | ||
298 | memory += x; | ||
299 | DBG(("%d. PTR %p / %d TOTAL %d MAX %d\n", ++count, a, x, memory, max)); | ||
300 | } | ||
301 | #else | ||
302 | #define DBG(x) | ||
303 | #endif | ||
304 | |||
305 | /**************************************************************************** | ||
306 | * | ||
307 | * FragBlock() | ||
308 | * | ||
309 | * This function makes FRAGMENTS of the BLOCK sent as argument. | ||
310 | * | ||
311 | ***************************************************************************/ | ||
312 | |||
313 | static void FragBlock(char *memp, int size) | ||
314 | { | ||
315 | struct MemFrag *frag=(struct MemFrag *)memp; | ||
316 | struct MemFrag *prev=NULL; /* no previous in the first round */ | ||
317 | int count=0; | ||
318 | while((count+size) <= DMEM_BLOCKSIZE) { | ||
319 | memp += size; | ||
320 | frag->next = (struct MemFrag *)memp; | ||
321 | frag->prev = prev; | ||
322 | prev = frag; | ||
323 | frag = frag->next; | ||
324 | count += size; | ||
325 | } | ||
326 | prev->next = NULL; /* the last one has no next struct */ | ||
327 | } | ||
328 | |||
329 | /*************************************************************************** | ||
330 | * | ||
331 | * initialize(); | ||
332 | * | ||
333 | * Called in the first dmalloc(). Inits a few memory things. | ||
334 | * | ||
335 | **************************************************************************/ | ||
336 | static void initialize(void) | ||
337 | { | ||
338 | int i; | ||
339 | /* Setup the nmax and fragsize fields of the top structs */ | ||
340 | for(i=0; i< sizeof(qinfo)/sizeof(qinfo[0]); i++) { | ||
341 | top[i].fragsize = qinfo[i]; | ||
342 | top[i].nmax = DMEM_BLOCKSIZE/qinfo[i]; | ||
343 | |||
344 | #ifdef PSOS | ||
345 | /* for some reason, these aren't nulled from start: */ | ||
346 | top[i].chain = NULL; /* no BLOCKS */ | ||
347 | top[i].nfree = 0; /* no FRAGMENTS */ | ||
348 | #endif | ||
349 | #ifdef SEMAPHORE | ||
350 | { | ||
351 | char name[7]; | ||
352 | sprintf(name, "MEM%d", i); | ||
353 | SEMAPHORECREATE(name, top[i].semaphore_id); | ||
354 | /* doesn't matter if it failed, we continue anyway ;-( */ | ||
355 | } | ||
356 | #endif | ||
357 | } | ||
358 | initialized = 1; | ||
359 | } | ||
360 | |||
361 | /**************************************************************************** | ||
362 | * | ||
363 | * FragFromBlock() | ||
364 | * | ||
365 | * This should return a fragment from the block and mark it as used | ||
366 | * accordingly. | ||
367 | * | ||
368 | ***************************************************************************/ | ||
369 | |||
370 | static void *FragFromBlock(struct MemBlock *block) | ||
371 | { | ||
372 | /* make frag point to the first free FRAGMENT */ | ||
373 | struct MemFrag *frag = block->first; | ||
374 | struct MemInfo *mem = (struct MemInfo *)frag; | ||
375 | |||
376 | /* | ||
377 | * Remove the FRAGMENT from the list and decrease the free counters. | ||
378 | */ | ||
379 | block->first = frag->next; /* new first free FRAGMENT */ | ||
380 | |||
381 | block->nfree--; /* BLOCK counter */ | ||
382 | block->top->nfree--; /* TOP counter */ | ||
383 | |||
384 | /* heal the FRAGMENT list */ | ||
385 | if(frag->prev) { | ||
386 | frag->prev->next = frag->next; | ||
387 | } | ||
388 | if(frag->next) { | ||
389 | frag->next->prev = frag->prev; | ||
390 | } | ||
391 | mem->block = block; /* no block bit set here */ | ||
392 | |||
393 | return ((char *)mem)+sizeof(struct MemInfo); | ||
394 | } | ||
395 | |||
396 | /*************************************************************************** | ||
397 | * | ||
398 | * dmalloc() | ||
399 | * | ||
400 | * This needs no explanation. A malloc() look-alike. | ||
401 | * | ||
402 | **************************************************************************/ | ||
403 | |||
404 | void *dmalloc(size_t size) | ||
405 | { | ||
406 | void *mem; | ||
407 | |||
408 | DBG(("dmalloc(%d)\n", size)); | ||
409 | |||
410 | if(!initialized) | ||
411 | initialize(); | ||
412 | |||
413 | /* First, we make room for the space needed in every allocation */ | ||
414 | size += sizeof(struct MemInfo); | ||
415 | |||
416 | if(size < DMEM_LARGESTSIZE) { | ||
417 | /* get a FRAGMENT */ | ||
418 | |||
419 | struct MemBlock *block=NULL; /* SAFE */ | ||
420 | struct MemBlock *newblock=NULL; /* SAFE */ | ||
421 | struct MemTop *memtop=NULL; /* SAFE */ | ||
422 | |||
423 | /* Determine which queue to use */ | ||
424 | int queue; | ||
425 | for(queue=0; size > qinfo[queue]; queue++) | ||
426 | ; | ||
427 | do { | ||
428 | /* This is the head master of our chain: */ | ||
429 | memtop = &top[queue]; | ||
430 | |||
431 | DBG(("Top info: %p %d %d %d\n", | ||
432 | memtop->chain, | ||
433 | memtop->nfree, | ||
434 | memtop->nmax, | ||
435 | memtop->fragsize)); | ||
436 | |||
437 | #ifdef SEMAPHORE | ||
438 | if(SEMAPHOREOBTAIN(memtop->semaphore_id)) | ||
439 | return NULL; /* failed somehow */ | ||
440 | #endif | ||
441 | |||
442 | /* get the first BLOCK in the chain */ | ||
443 | block = memtop->chain; | ||
444 | |||
445 | /* check if we have a free FRAGMENT */ | ||
446 | if(memtop->nfree) { | ||
447 | /* there exists a free FRAGMENT in this chain */ | ||
448 | |||
449 | /* I WANT THIS LOOP OUT OF HERE! */ | ||
450 | |||
451 | /* search for the free FRAGMENT */ | ||
452 | while(!block->nfree) | ||
453 | block = block->next; /* check next BLOCK */ | ||
454 | |||
455 | /* | ||
456 | * Now 'block' is the first BLOCK with a free FRAGMENT | ||
457 | */ | ||
458 | |||
459 | mem = FragFromBlock(block); | ||
460 | |||
461 | } | ||
462 | else { | ||
463 | /* we do *not* have a free FRAGMENT but need to get us a new BLOCK */ | ||
464 | |||
465 | DMEM_OSALLOCMEM(DMEM_BLOCKSIZE + sizeof(struct MemBlock), | ||
466 | newblock, | ||
467 | struct MemBlock *); | ||
468 | if(!newblock) { | ||
469 | if(++queue < sizeof(qinfo)/sizeof(qinfo[0])) { | ||
470 | /* There are queues for bigger FRAGMENTS that we should check | ||
471 | before we fail this for real */ | ||
472 | #ifdef DEBUG | ||
473 | printf("*** " __FILE__ " Trying a bigger Q: %d\n", queue); | ||
474 | #endif | ||
475 | mem = NULL; | ||
476 | } | ||
477 | else { | ||
478 | dmalloc_failed(size- sizeof(struct MemInfo)); | ||
479 | return NULL; /* not enough memory */ | ||
480 | } | ||
481 | } | ||
482 | else { | ||
483 | /* allocation of big BLOCK was successful */ | ||
484 | |||
485 | MEMINCR(newblock, DMEM_BLOCKSIZE + sizeof(struct MemBlock)); | ||
486 | |||
487 | memtop->chain = newblock; /* attach this BLOCK to the chain */ | ||
488 | newblock->next = block; /* point to the previous first BLOCK */ | ||
489 | if(block) | ||
490 | block->prev = newblock; /* point back on this new BLOCK */ | ||
491 | newblock->prev = NULL; /* no previous */ | ||
492 | newblock->top = memtop; /* our head master */ | ||
493 | |||
494 | /* point to the new first FRAGMENT */ | ||
495 | newblock->first = (struct MemFrag *) | ||
496 | ((char *)newblock+sizeof(struct MemBlock)); | ||
497 | |||
498 | /* create FRAGMENTS of the BLOCK: */ | ||
499 | FragBlock((char *)newblock->first, memtop->fragsize); | ||
500 | |||
501 | #if defined(DEBUG) && !defined(BMALLOC) | ||
502 | checkmem((char *)newblock); | ||
503 | #endif | ||
504 | |||
505 | /* fix the nfree counters */ | ||
506 | newblock->nfree = memtop->nmax; | ||
507 | memtop->nfree += memtop->nmax; | ||
508 | |||
509 | /* get a FRAGMENT from the BLOCK */ | ||
510 | mem = FragFromBlock(newblock); | ||
511 | } | ||
512 | } | ||
513 | #ifdef SEMAPHORE | ||
514 | SEMAPHORERETURN(memtop->semaphore_id); /* let it go */ | ||
515 | #endif | ||
516 | } while(NULL == mem); /* if we should retry a larger FRAGMENT */ | ||
517 | } | ||
518 | else { | ||
519 | /* get a stand-alone BLOCK */ | ||
520 | struct MemInfo *meminfo; | ||
521 | |||
522 | if(size&1) | ||
523 | /* don't leave this with an odd size since we'll use that bit for | ||
524 | information */ | ||
525 | size++; | ||
526 | |||
527 | DMEM_OSALLOCMEM(size, meminfo, struct MemInfo *); | ||
528 | |||
529 | if(meminfo) { | ||
530 | MEMINCR(meminfo, size); | ||
531 | meminfo->block = (void *)(size|BLOCK_BIT); | ||
532 | mem = (char *)meminfo + sizeof(struct MemInfo); | ||
533 | } | ||
534 | else { | ||
535 | dmalloc_failed(size); | ||
536 | mem = NULL; | ||
537 | } | ||
538 | } | ||
539 | return (void *)mem; | ||
540 | } | ||
541 | |||
542 | /*************************************************************************** | ||
543 | * | ||
544 | * dfree() | ||
545 | * | ||
546 | * This needs no explanation. A free() look-alike. | ||
547 | * | ||
548 | **************************************************************************/ | ||
549 | |||
550 | void dfree(void *memp) | ||
551 | { | ||
552 | struct MemInfo *meminfo = (struct MemInfo *) | ||
553 | ((char *)memp- sizeof(struct MemInfo)); | ||
554 | |||
555 | DBG(("dfree(%p)\n", memp)); | ||
556 | |||
557 | if(!((size_t)meminfo->block&BLOCK_BIT)) { | ||
558 | /* this is a FRAGMENT we have to deal with */ | ||
559 | |||
560 | struct MemBlock *block=meminfo->block; | ||
561 | struct MemTop *memtop = block->top; | ||
562 | |||
563 | #ifdef SEMAPHORE | ||
564 | SEMAPHOREOBTAIN(memtop->semaphore_id); | ||
565 | #endif | ||
566 | |||
567 | /* increase counters */ | ||
568 | block->nfree++; | ||
569 | memtop->nfree++; | ||
570 | |||
571 | /* is this BLOCK completely empty now? */ | ||
572 | if(block->nfree == memtop->nmax) { | ||
573 | /* yes, return the BLOCK to the system */ | ||
574 | if(block->prev) | ||
575 | block->prev->next = block->next; | ||
576 | else | ||
577 | memtop->chain = block->next; | ||
578 | if(block->next) | ||
579 | block->next->prev = block->prev; | ||
580 | |||
581 | memtop->nfree -= memtop->nmax; /* total counter subtraction */ | ||
582 | MEMDECR(block, DMEM_BLOCKSIZE + sizeof(struct MemBlock)); | ||
583 | DMEM_OSFREEMEM((void *)block); /* return the whole block */ | ||
584 | } | ||
585 | else { | ||
586 | /* there are still used FRAGMENTS in the BLOCK, link this one | ||
587 | into the chain of free ones */ | ||
588 | struct MemFrag *frag = (struct MemFrag *)meminfo; | ||
589 | frag->prev = NULL; | ||
590 | frag->next = block->first; | ||
591 | if(block->first) | ||
592 | block->first->prev = frag; | ||
593 | block->first = frag; | ||
594 | } | ||
595 | #ifdef SEMAPHORE | ||
596 | SEMAPHORERETURN(memtop->semaphore_id); | ||
597 | #endif | ||
598 | } | ||
599 | else { | ||
600 | /* big stand-alone block, just give it back to the OS: */ | ||
601 | MEMDECR(&meminfo->block, (size_t)meminfo->block&~BLOCK_BIT); /* clean BLOCK_BIT */ | ||
602 | DMEM_OSFREEMEM((void *)meminfo); | ||
603 | } | ||
604 | } | ||
605 | |||
606 | /*************************************************************************** | ||
607 | * | ||
608 | * drealloc() | ||
609 | * | ||
610 | * This needs no explanation. A realloc() look-alike. | ||
611 | * | ||
612 | **************************************************************************/ | ||
613 | |||
614 | void *drealloc(char *ptr, size_t size) | ||
615 | { | ||
616 | struct MemInfo *meminfo = (struct MemInfo *) | ||
617 | ((char *)ptr- sizeof(struct MemInfo)); | ||
618 | /* | ||
619 | * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
620 | * NOTE: the ->size field of the meminfo will now contain the MemInfo | ||
621 | * struct size too! | ||
622 | * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
623 | */ | ||
624 | void *mem=NULL; /* SAFE */ | ||
625 | size_t prevsize; | ||
626 | |||
627 | /* NOTE that this is only valid if BLOCK_BIT isn't set: */ | ||
628 | struct MemBlock *block; | ||
629 | |||
630 | DBG(("drealloc(%p, %d)\n", ptr, size)); | ||
631 | |||
632 | if(NULL == ptr) | ||
633 | return dmalloc( size ); | ||
634 | |||
635 | block = meminfo->block; | ||
636 | |||
637 | if(!((size_t)meminfo->block&BLOCK_BIT) && | ||
638 | (size + sizeof(struct MemInfo) < | ||
639 | (prevsize = block->top->fragsize) )) { | ||
640 | /* This is a FRAGMENT and new size is possible to retain within the same | ||
641 | FRAGMENT */ | ||
642 | if((prevsize > qinfo[0]) && | ||
643 | /* this is not the smallest memory Q */ | ||
644 | (size < (block->top-1)->fragsize)) | ||
645 | /* this fits in a smaller Q */ | ||
646 | ; | ||
647 | else | ||
648 | mem = ptr; /* Just return the same pointer as we got in. */ | ||
649 | } | ||
650 | if(!mem) { | ||
651 | /* This is a stand-alone BLOCK or a realloc that no longer fits within | ||
652 | the same FRAGMENT */ | ||
653 | |||
654 | if((size_t)meminfo->block&BLOCK_BIT) { | ||
655 | prevsize = ((size_t)meminfo->block&~BLOCK_BIT) - | ||
656 | sizeof(struct MemInfo); | ||
657 | } | ||
658 | else | ||
659 | prevsize -= sizeof(struct MemInfo); | ||
660 | |||
661 | /* No tricks involved here, just grab a new bite of memory, copy the data | ||
662 | * from the old place and free the old memory again. */ | ||
663 | mem = dmalloc(size); | ||
664 | if(mem) { | ||
665 | memcpy(mem, ptr, MIN(size, prevsize) ); | ||
666 | dfree(ptr); | ||
667 | } | ||
668 | } | ||
669 | return mem; | ||
670 | } | ||
671 | |||
672 | /*************************************************************************** | ||
673 | * | ||
674 | * dcalloc() | ||
675 | * | ||
676 | * This needs no explanation. A calloc() look-alike. | ||
677 | * | ||
678 | **************************************************************************/ | ||
679 | /* Allocate an array of NMEMB elements each SIZE bytes long. | ||
680 | The entire array is initialized to zeros. */ | ||
681 | void * | ||
682 | dcalloc (size_t nmemb, size_t size) | ||
683 | { | ||
684 | void *result = dmalloc (nmemb * size); | ||
685 | |||
686 | if (result != NULL) | ||
687 | memset (result, 0, nmemb * size); | ||
688 | |||
689 | return result; | ||
690 | } | ||
691 | /***************************************************************************** | ||
692 | * | ||
693 | * Dynamic Memory Allocation | ||
694 | * | ||
695 | * Author: Daniel Stenberg | ||
696 | * Date: March 10, 1997 | ||
697 | * Version: 2.3 | ||
698 | * Email: Daniel.Stenberg@sth.frontec.se | ||
699 | * | ||
700 | * | ||
701 | * Read 'thoughts' for theories and details of this implementation. | ||
702 | * | ||
703 | * v2.1 | ||
704 | * - I once again managed to gain some memory. BLOCK allocations now only use | ||
705 | * a 4 bytes header (instead of previos 8) just as FRAGMENTS. | ||
706 | * | ||
707 | * v2.2 | ||
708 | * - Re-adjusted the fragment sizes to better fit into the somewhat larger | ||
709 | * block. | ||
710 | * | ||
711 | * v2.3 | ||
712 | * - Made realloc(NULL, size) work as it should. Which is like a malloc(size) | ||
713 | * | ||
714 | *****************************************************************************/ | ||
715 | |||
716 | #include <stdio.h> | ||
717 | #include <string.h> | ||
718 | |||
719 | #ifdef DEBUG | ||
720 | #include <stdarg.h> | ||
721 | #endif | ||
722 | |||
723 | #ifdef PSOS | ||
724 | #include <psos.h> | ||
725 | #define SEMAPHORE /* the PSOS routines use semaphore protection */ | ||
726 | #else | ||
727 | #include <stdlib.h> /* makes the PSOS complain on the 'size_t' typedef */ | ||
728 | #endif | ||
729 | |||
730 | #ifdef BMALLOC | ||
731 | #include "bmalloc.h" | ||
732 | #endif | ||
733 | |||
734 | /* Each TOP takes care of a chain of BLOCKS */ | ||
735 | struct MemTop { | ||
736 | struct MemBlock *chain; /* pointer to the BLOCK chain */ | ||
737 | long nfree; /* total number of free FRAGMENTS in the chain */ | ||
738 | short nmax; /* total number of FRAGMENTS in this kind of BLOCK */ | ||
739 | size_t fragsize; /* the size of each FRAGMENT */ | ||
740 | |||
741 | #ifdef SEMAPHORE /* if we're protecting the list with SEMAPHORES */ | ||
742 | long semaphore_id; /* semaphore used to lock this particular list */ | ||
743 | #endif | ||
744 | |||
745 | }; | ||
746 | |||
747 | /* Each BLOCK takes care of an amount of FRAGMENTS */ | ||
748 | struct MemBlock { | ||
749 | struct MemTop *top; /* our TOP struct */ | ||
750 | struct MemBlock *next; /* next BLOCK */ | ||
751 | struct MemBlock *prev; /* prev BLOCK */ | ||
752 | |||
753 | struct MemFrag *first; /* the first free FRAGMENT in this block */ | ||
754 | |||
755 | short nfree; /* number of free FRAGMENTS in this BLOCK */ | ||
756 | }; | ||
757 | |||
758 | /* This is the data kept in all _free_ FRAGMENTS */ | ||
759 | struct MemFrag { | ||
760 | struct MemFrag *next; /* next free FRAGMENT */ | ||
761 | struct MemFrag *prev; /* prev free FRAGMENT */ | ||
762 | }; | ||
763 | |||
764 | /* This is the data kept in all _allocated_ FRAGMENTS and BLOCKS. We add this | ||
765 | to the allocation size first thing in the ALLOC function to make room for | ||
766 | this smoothly. */ | ||
767 | |||
768 | struct MemInfo { | ||
769 | void *block; | ||
770 | /* which BLOCK is our father, if BLOCK_BIT is set it means this is a | ||
771 | stand-alone, large allocation and then the rest of the bits should be | ||
772 | treated as the size of the block */ | ||
773 | #define BLOCK_BIT 1 | ||
774 | }; | ||
775 | |||
776 | /* ---------------------------------------------------------------------- */ | ||
777 | /* Defines */ | ||
778 | /* ---------------------------------------------------------------------- */ | ||
779 | |||
780 | #ifdef DEBUG | ||
781 | #define MEMINCR(addr,x) memchange(addr, x) | ||
782 | #define MEMDECR(addr,x) memchange(addr,-(x)) | ||
783 | #else | ||
784 | #define MEMINCR(a,x) | ||
785 | #define MEMDECR(a,x) | ||
786 | #endif | ||
787 | |||
788 | /* The low level functions used to get memory from the OS and to return memory | ||
789 | to the OS, we may also define a stub that does the actual allocation and | ||
790 | free, these are the defined function names used in the dmalloc system | ||
791 | anyway: */ | ||
792 | #ifdef PSOS | ||
793 | |||
794 | #ifdef DEBUG | ||
795 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)dbgmalloc(size) | ||
796 | #define DMEM_OSFREEMEM(x) dbgfree(x) | ||
797 | #else | ||
798 | #define DMEM_OSALLOCMEM(size,pointer,type) rn_getseg(0,size,RN_NOWAIT,0,(void **)&pointer) | ||
799 | /* Similar, but this returns the memory */ | ||
800 | #define DMEM_OSFREEMEM(x) rn_retseg(0, x) | ||
801 | #endif | ||
802 | |||
803 | /* Argument: <id> */ | ||
804 | #define SEMAPHOREOBTAIN(x) sm_p(x, SM_WAIT, 0) | ||
805 | /* Argument: <id> */ | ||
806 | #define SEMAPHORERETURN(x) sm_v(x) | ||
807 | /* Argument: <name> <id-variable name> */ | ||
808 | #define SEMAPHORECREATE(x,y) sm_create(x, 1, SM_FIFO, (ULONG *)&(y)) | ||
809 | |||
810 | #else | ||
811 | #ifdef BMALLOC /* use our own big-memory-allocation system */ | ||
812 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)bmalloc(size) | ||
813 | #define DMEM_OSFREEMEM(x) bfree(x) | ||
814 | #elif DEBUG | ||
815 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)dbgmalloc(size) | ||
816 | #define DMEM_OSFREEMEM(x) dbgfree(x) | ||
817 | #else | ||
818 | #define DMEM_OSALLOCMEM(size,pointer,type) pointer=(type)malloc(size) | ||
819 | #define DMEM_OSFREEMEM(x) free(x) | ||
820 | #endif | ||
821 | #endif | ||
822 | |||
823 | |||
824 | /* the largest memory allocation that is made a FRAGMENT: (grab the highest | ||
825 | number from the list below) */ | ||
826 | #define DMEM_LARGESTSIZE 2032 | ||
827 | |||
828 | /* The total size of a BLOCK used for FRAGMENTS | ||
829 | In order to make this use only *1* even alignment from the big-block- | ||
830 | allocation-system (possible the bmalloc() system also written by me) | ||
831 | we need to subtract the [maximum] struct sizes that could get added all | ||
832 | the way through to the grab from the memory. */ | ||
833 | #define DMEM_BLOCKSIZE 4064 /* (4096 - sizeof(struct MemBlock) - 12) */ | ||
834 | |||
835 | /* Since the blocksize isn't an even 2^X story anymore, we make a table with | ||
836 | the FRAGMENT sizes and amounts that fills up a BLOCK nicely */ | ||
837 | |||
838 | /* a little 'bc' script that helps us maximize the usage: | ||
839 | - for 32-bit aligned addresses (SPARC crashes otherwise): | ||
840 | for(i=20; i<2040; i++) { a=4064/i; if(a*i >= 4060) { if(i%4==0) {i;} } } | ||
841 | |||
842 | |||
843 | I try to approximate a double of each size, starting with ~20. We don't do | ||
844 | ODD sizes since several CPU flavours dump core when accessing such | ||
845 | addresses. We try to do 32-bit aligned to make ALL kinds of CPUs to remain | ||
846 | happy with us. | ||
847 | */ | ||
848 | |||
849 | #if BIGBLOCKS==4060 /* previously */ | ||
850 | short qinfo[]= { 20, 28, 52, 116, 312, 580, 812, 2028 }; | ||
851 | #else | ||
852 | short qinfo[]= { 20, 28, 52, 116, 312, 580, 1016, 2032}; | ||
853 | /* 52 and 312 only make use of 4056 bytes, but without them there are too | ||
854 | wide gaps */ | ||
855 | #endif | ||
856 | |||
857 | #define MIN(x,y) ((x)<(y)?(x):(y)) | ||
858 | |||
859 | /* ---------------------------------------------------------------------- */ | ||
860 | /* Globals */ | ||
861 | /* ---------------------------------------------------------------------- */ | ||
862 | |||
863 | /* keeper of the chain of BLOCKS */ | ||
864 | static struct MemTop top[ sizeof(qinfo)/sizeof(qinfo[0]) ]; | ||
865 | |||
866 | /* are we experienced? */ | ||
867 | static char initialized = 0; | ||
868 | |||
869 | /* ---------------------------------------------------------------------- */ | ||
870 | /* Start of the real code */ | ||
871 | /* ---------------------------------------------------------------------- */ | ||
872 | |||
873 | #ifdef DEBUG | ||
874 | /************ | ||
875 | * A few functions that are verbose and tells us about the current status | ||
876 | * of the dmalloc system | ||
877 | ***********/ | ||
878 | |||
879 | static void dmalloc_status() | ||
880 | { | ||
881 | int i; | ||
882 | int used; | ||
883 | int num; | ||
884 | int totalfree=0; | ||
885 | struct MemBlock *block; | ||
886 | for(i=0; i<sizeof(qinfo)/sizeof(qinfo[0]);i++) { | ||
887 | block = top[i].chain; | ||
888 | used = 0; | ||
889 | num = 0; | ||
890 | while(block) { | ||
891 | used += top[i].nmax-block->nfree; | ||
892 | num++; | ||
893 | block = block->next; | ||
894 | } | ||
895 | printf("Q %d (FRAG %4d), USED %4d FREE %4ld (SIZE %4ld) BLOCKS %d\n", | ||
896 | i, top[i].fragsize, used, top[i].nfree, | ||
897 | top[i].nfree*top[i].fragsize, num); | ||
898 | totalfree += top[i].nfree*top[i].fragsize; | ||
899 | } | ||
900 | printf("Total unused memory stolen by dmalloc: %d\n", totalfree); | ||
901 | } | ||
902 | |||
903 | static void dmalloc_failed(size_t size) | ||
904 | { | ||
905 | printf("*** " __FILE__ " Couldn't allocate %d bytes\n", size); | ||
906 | dmalloc_status(); | ||
907 | } | ||
908 | #else | ||
909 | #define dmalloc_failed(x) | ||
910 | #endif | ||
911 | |||
912 | #ifdef DEBUG | ||
913 | |||
914 | #define BORDER 1200 | ||
915 | |||
916 | void *dbgmalloc(int size) | ||
917 | { | ||
918 | char *mem; | ||
919 | size += BORDER; | ||
920 | #ifdef PSOS | ||
921 | rn_getseg(0,size,RN_NOWAIT,0,(void **)&mem); | ||
922 | #else | ||
923 | mem = malloc(size); | ||
924 | #endif | ||
925 | if(mem) { | ||
926 | memset(mem, 0xaa, BORDER/2); | ||
927 | memset(mem+BORDER/2, 0xbb, size -BORDER); | ||
928 | memset(mem-BORDER/2+size, 0xcc, BORDER/2); | ||
929 | *(long *)mem = size; | ||
930 | mem += (BORDER/2); | ||
931 | } | ||
932 | printf("OSmalloc(%p)\n", mem); | ||
933 | return (void *)mem; | ||
934 | } | ||
935 | |||
936 | void checkmem(char *ptr) | ||
937 | { | ||
938 | int i; | ||
939 | long size; | ||
940 | ptr -= BORDER/2; | ||
941 | |||
942 | for(i=4; i<(BORDER/2); i++) | ||
943 | if((unsigned char)ptr[i] != 0xaa) { | ||
944 | printf("########### ALERT ALERT\n"); | ||
945 | break; | ||
946 | } | ||
947 | size = *(long *)ptr; | ||
948 | for(i=size-1; i>=(size - BORDER/2); i--) | ||
949 | if((unsigned char)ptr[i] != 0xcc) { | ||
950 | printf("********* POST ALERT\n"); | ||
951 | break; | ||
952 | } | ||
953 | } | ||
954 | |||
955 | void dbgfree(char *ptr) | ||
956 | { | ||
957 | long size; | ||
958 | checkmem(ptr); | ||
959 | ptr -= BORDER/2; | ||
960 | size = *(long *)ptr; | ||
961 | |||
962 | printf("OSfree(%ld)\n", size); | ||
963 | #ifdef PSOS | ||
964 | rn_retseg(0, ptr); | ||
965 | #else | ||
966 | free(ptr); | ||
967 | #endif | ||
968 | } | ||
969 | |||
970 | |||
971 | #define DBG(x) syslog x | ||
972 | |||
973 | void syslog(char *fmt, ...) | ||
974 | { | ||
975 | va_list ap; | ||
976 | va_start(ap, fmt); | ||
977 | vfprintf(stdout, fmt, ap); | ||
978 | va_end(ap); | ||
979 | } | ||
980 | |||
981 | void memchange(void *a, int x) | ||
982 | { | ||
983 | static int memory=0; | ||
984 | static int count=0; | ||
985 | static int max=0; | ||
986 | if(memory > max) | ||
987 | max = memory; | ||
988 | memory += x; | ||
989 | DBG(("%d. PTR %p / %d TOTAL %d MAX %d\n", ++count, a, x, memory, max)); | ||
990 | } | ||
991 | #else | ||
992 | #define DBG(x) | ||
993 | #endif | ||
994 | |||
995 | /**************************************************************************** | ||
996 | * | ||
997 | * FragBlock() | ||
998 | * | ||
999 | * This function makes FRAGMENTS of the BLOCK sent as argument. | ||
1000 | * | ||
1001 | ***************************************************************************/ | ||
1002 | |||
1003 | static void FragBlock(char *memp, int size) | ||
1004 | { | ||
1005 | struct MemFrag *frag=(struct MemFrag *)memp; | ||
1006 | struct MemFrag *prev=NULL; /* no previous in the first round */ | ||
1007 | int count=0; | ||
1008 | while((count+size) <= DMEM_BLOCKSIZE) { | ||
1009 | memp += size; | ||
1010 | frag->next = (struct MemFrag *)memp; | ||
1011 | frag->prev = prev; | ||
1012 | prev = frag; | ||
1013 | frag = frag->next; | ||
1014 | count += size; | ||
1015 | } | ||
1016 | prev->next = NULL; /* the last one has no next struct */ | ||
1017 | } | ||
1018 | |||
1019 | /*************************************************************************** | ||
1020 | * | ||
1021 | * initialize(); | ||
1022 | * | ||
1023 | * Called in the first dmalloc(). Inits a few memory things. | ||
1024 | * | ||
1025 | **************************************************************************/ | ||
1026 | static void initialize(void) | ||
1027 | { | ||
1028 | int i; | ||
1029 | /* Setup the nmax and fragsize fields of the top structs */ | ||
1030 | for(i=0; i< sizeof(qinfo)/sizeof(qinfo[0]); i++) { | ||
1031 | top[i].fragsize = qinfo[i]; | ||
1032 | top[i].nmax = DMEM_BLOCKSIZE/qinfo[i]; | ||
1033 | |||
1034 | #ifdef PSOS | ||
1035 | /* for some reason, these aren't nulled from start: */ | ||
1036 | top[i].chain = NULL; /* no BLOCKS */ | ||
1037 | top[i].nfree = 0; /* no FRAGMENTS */ | ||
1038 | #endif | ||
1039 | #ifdef SEMAPHORE | ||
1040 | { | ||
1041 | char name[7]; | ||
1042 | sprintf(name, "MEM%d", i); | ||
1043 | SEMAPHORECREATE(name, top[i].semaphore_id); | ||
1044 | /* doesn't matter if it failed, we continue anyway ;-( */ | ||
1045 | } | ||
1046 | #endif | ||
1047 | } | ||
1048 | initialized = 1; | ||
1049 | } | ||
1050 | |||
1051 | /**************************************************************************** | ||
1052 | * | ||
1053 | * FragFromBlock() | ||
1054 | * | ||
1055 | * This should return a fragment from the block and mark it as used | ||
1056 | * accordingly. | ||
1057 | * | ||
1058 | ***************************************************************************/ | ||
1059 | |||
1060 | static void *FragFromBlock(struct MemBlock *block) | ||
1061 | { | ||
1062 | /* make frag point to the first free FRAGMENT */ | ||
1063 | struct MemFrag *frag = block->first; | ||
1064 | struct MemInfo *mem = (struct MemInfo *)frag; | ||
1065 | |||
1066 | /* | ||
1067 | * Remove the FRAGMENT from the list and decrease the free counters. | ||
1068 | */ | ||
1069 | block->first = frag->next; /* new first free FRAGMENT */ | ||
1070 | |||
1071 | block->nfree--; /* BLOCK counter */ | ||
1072 | block->top->nfree--; /* TOP counter */ | ||
1073 | |||
1074 | /* heal the FRAGMENT list */ | ||
1075 | if(frag->prev) { | ||
1076 | frag->prev->next = frag->next; | ||
1077 | } | ||
1078 | if(frag->next) { | ||
1079 | frag->next->prev = frag->prev; | ||
1080 | } | ||
1081 | mem->block = block; /* no block bit set here */ | ||
1082 | |||
1083 | return ((char *)mem)+sizeof(struct MemInfo); | ||
1084 | } | ||
1085 | |||
1086 | /*************************************************************************** | ||
1087 | * | ||
1088 | * dmalloc() | ||
1089 | * | ||
1090 | * This needs no explanation. A malloc() look-alike. | ||
1091 | * | ||
1092 | **************************************************************************/ | ||
1093 | |||
1094 | void *dmalloc(size_t size) | ||
1095 | { | ||
1096 | void *mem; | ||
1097 | |||
1098 | DBG(("dmalloc(%d)\n", size)); | ||
1099 | |||
1100 | if(!initialized) | ||
1101 | initialize(); | ||
1102 | |||
1103 | /* First, we make room for the space needed in every allocation */ | ||
1104 | size += sizeof(struct MemInfo); | ||
1105 | |||
1106 | if(size < DMEM_LARGESTSIZE) { | ||
1107 | /* get a FRAGMENT */ | ||
1108 | |||
1109 | struct MemBlock *block=NULL; /* SAFE */ | ||
1110 | struct MemBlock *newblock=NULL; /* SAFE */ | ||
1111 | struct MemTop *memtop=NULL; /* SAFE */ | ||
1112 | |||
1113 | /* Determine which queue to use */ | ||
1114 | int queue; | ||
1115 | for(queue=0; size > qinfo[queue]; queue++) | ||
1116 | ; | ||
1117 | do { | ||
1118 | /* This is the head master of our chain: */ | ||
1119 | memtop = &top[queue]; | ||
1120 | |||
1121 | DBG(("Top info: %p %d %d %d\n", | ||
1122 | memtop->chain, | ||
1123 | memtop->nfree, | ||
1124 | memtop->nmax, | ||
1125 | memtop->fragsize)); | ||
1126 | |||
1127 | #ifdef SEMAPHORE | ||
1128 | if(SEMAPHOREOBTAIN(memtop->semaphore_id)) | ||
1129 | return NULL; /* failed somehow */ | ||
1130 | #endif | ||
1131 | |||
1132 | /* get the first BLOCK in the chain */ | ||
1133 | block = memtop->chain; | ||
1134 | |||
1135 | /* check if we have a free FRAGMENT */ | ||
1136 | if(memtop->nfree) { | ||
1137 | /* there exists a free FRAGMENT in this chain */ | ||
1138 | |||
1139 | /* I WANT THIS LOOP OUT OF HERE! */ | ||
1140 | |||
1141 | /* search for the free FRAGMENT */ | ||
1142 | while(!block->nfree) | ||
1143 | block = block->next; /* check next BLOCK */ | ||
1144 | |||
1145 | /* | ||
1146 | * Now 'block' is the first BLOCK with a free FRAGMENT | ||
1147 | */ | ||
1148 | |||
1149 | mem = FragFromBlock(block); | ||
1150 | |||
1151 | } | ||
1152 | else { | ||
1153 | /* we do *not* have a free FRAGMENT but need to get us a new BLOCK */ | ||
1154 | |||
1155 | DMEM_OSALLOCMEM(DMEM_BLOCKSIZE + sizeof(struct MemBlock), | ||
1156 | newblock, | ||
1157 | struct MemBlock *); | ||
1158 | if(!newblock) { | ||
1159 | if(++queue < sizeof(qinfo)/sizeof(qinfo[0])) { | ||
1160 | /* There are queues for bigger FRAGMENTS that we should check | ||
1161 | before we fail this for real */ | ||
1162 | #ifdef DEBUG | ||
1163 | printf("*** " __FILE__ " Trying a bigger Q: %d\n", queue); | ||
1164 | #endif | ||
1165 | mem = NULL; | ||
1166 | } | ||
1167 | else { | ||
1168 | dmalloc_failed(size- sizeof(struct MemInfo)); | ||
1169 | return NULL; /* not enough memory */ | ||
1170 | } | ||
1171 | } | ||
1172 | else { | ||
1173 | /* allocation of big BLOCK was successful */ | ||
1174 | |||
1175 | MEMINCR(newblock, DMEM_BLOCKSIZE + sizeof(struct MemBlock)); | ||
1176 | |||
1177 | memtop->chain = newblock; /* attach this BLOCK to the chain */ | ||
1178 | newblock->next = block; /* point to the previous first BLOCK */ | ||
1179 | if(block) | ||
1180 | block->prev = newblock; /* point back on this new BLOCK */ | ||
1181 | newblock->prev = NULL; /* no previous */ | ||
1182 | newblock->top = memtop; /* our head master */ | ||
1183 | |||
1184 | /* point to the new first FRAGMENT */ | ||
1185 | newblock->first = (struct MemFrag *) | ||
1186 | ((char *)newblock+sizeof(struct MemBlock)); | ||
1187 | |||
1188 | /* create FRAGMENTS of the BLOCK: */ | ||
1189 | FragBlock((char *)newblock->first, memtop->fragsize); | ||
1190 | |||
1191 | #if defined(DEBUG) && !defined(BMALLOC) | ||
1192 | checkmem((char *)newblock); | ||
1193 | #endif | ||
1194 | |||
1195 | /* fix the nfree counters */ | ||
1196 | newblock->nfree = memtop->nmax; | ||
1197 | memtop->nfree += memtop->nmax; | ||
1198 | |||
1199 | /* get a FRAGMENT from the BLOCK */ | ||
1200 | mem = FragFromBlock(newblock); | ||
1201 | } | ||
1202 | } | ||
1203 | #ifdef SEMAPHORE | ||
1204 | SEMAPHORERETURN(memtop->semaphore_id); /* let it go */ | ||
1205 | #endif | ||
1206 | } while(NULL == mem); /* if we should retry a larger FRAGMENT */ | ||
1207 | } | ||
1208 | else { | ||
1209 | /* get a stand-alone BLOCK */ | ||
1210 | struct MemInfo *meminfo; | ||
1211 | |||
1212 | if(size&1) | ||
1213 | /* don't leave this with an odd size since we'll use that bit for | ||
1214 | information */ | ||
1215 | size++; | ||
1216 | |||
1217 | DMEM_OSALLOCMEM(size, meminfo, struct MemInfo *); | ||
1218 | |||
1219 | if(meminfo) { | ||
1220 | MEMINCR(meminfo, size); | ||
1221 | meminfo->block = (void *)(size|BLOCK_BIT); | ||
1222 | mem = (char *)meminfo + sizeof(struct MemInfo); | ||
1223 | } | ||
1224 | else { | ||
1225 | dmalloc_failed(size); | ||
1226 | mem = NULL; | ||
1227 | } | ||
1228 | } | ||
1229 | return (void *)mem; | ||
1230 | } | ||
1231 | |||
1232 | /*************************************************************************** | ||
1233 | * | ||
1234 | * dfree() | ||
1235 | * | ||
1236 | * This needs no explanation. A free() look-alike. | ||
1237 | * | ||
1238 | **************************************************************************/ | ||
1239 | |||
1240 | void dfree(void *memp) | ||
1241 | { | ||
1242 | struct MemInfo *meminfo = (struct MemInfo *) | ||
1243 | ((char *)memp- sizeof(struct MemInfo)); | ||
1244 | |||
1245 | DBG(("dfree(%p)\n", memp)); | ||
1246 | |||
1247 | if(!((size_t)meminfo->block&BLOCK_BIT)) { | ||
1248 | /* this is a FRAGMENT we have to deal with */ | ||
1249 | |||
1250 | struct MemBlock *block=meminfo->block; | ||
1251 | struct MemTop *memtop = block->top; | ||
1252 | |||
1253 | #ifdef SEMAPHORE | ||
1254 | SEMAPHOREOBTAIN(memtop->semaphore_id); | ||
1255 | #endif | ||
1256 | |||
1257 | /* increase counters */ | ||
1258 | block->nfree++; | ||
1259 | memtop->nfree++; | ||
1260 | |||
1261 | /* is this BLOCK completely empty now? */ | ||
1262 | if(block->nfree == memtop->nmax) { | ||
1263 | /* yes, return the BLOCK to the system */ | ||
1264 | if(block->prev) | ||
1265 | block->prev->next = block->next; | ||
1266 | else | ||
1267 | memtop->chain = block->next; | ||
1268 | if(block->next) | ||
1269 | block->next->prev = block->prev; | ||
1270 | |||
1271 | memtop->nfree -= memtop->nmax; /* total counter subtraction */ | ||
1272 | MEMDECR(block, DMEM_BLOCKSIZE + sizeof(struct MemBlock)); | ||
1273 | DMEM_OSFREEMEM((void *)block); /* return the whole block */ | ||
1274 | } | ||
1275 | else { | ||
1276 | /* there are still used FRAGMENTS in the BLOCK, link this one | ||
1277 | into the chain of free ones */ | ||
1278 | struct MemFrag *frag = (struct MemFrag *)meminfo; | ||
1279 | frag->prev = NULL; | ||
1280 | frag->next = block->first; | ||
1281 | if(block->first) | ||
1282 | block->first->prev = frag; | ||
1283 | block->first = frag; | ||
1284 | } | ||
1285 | #ifdef SEMAPHORE | ||
1286 | SEMAPHORERETURN(memtop->semaphore_id); | ||
1287 | #endif | ||
1288 | } | ||
1289 | else { | ||
1290 | /* big stand-alone block, just give it back to the OS: */ | ||
1291 | MEMDECR(&meminfo->block, (size_t)meminfo->block&~BLOCK_BIT); /* clean BLOCK_BIT */ | ||
1292 | DMEM_OSFREEMEM((void *)meminfo); | ||
1293 | } | ||
1294 | } | ||
1295 | |||
1296 | /*************************************************************************** | ||
1297 | * | ||
1298 | * drealloc() | ||
1299 | * | ||
1300 | * This needs no explanation. A realloc() look-alike. | ||
1301 | * | ||
1302 | **************************************************************************/ | ||
1303 | |||
1304 | void *drealloc(char *ptr, size_t size) | ||
1305 | { | ||
1306 | struct MemInfo *meminfo = (struct MemInfo *) | ||
1307 | ((char *)ptr- sizeof(struct MemInfo)); | ||
1308 | /* | ||
1309 | * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
1310 | * NOTE: the ->size field of the meminfo will now contain the MemInfo | ||
1311 | * struct size too! | ||
1312 | * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
1313 | */ | ||
1314 | void *mem=NULL; /* SAFE */ | ||
1315 | size_t prevsize; | ||
1316 | |||
1317 | /* NOTE that this is only valid if BLOCK_BIT isn't set: */ | ||
1318 | struct MemBlock *block; | ||
1319 | |||
1320 | DBG(("drealloc(%p, %d)\n", ptr, size)); | ||
1321 | |||
1322 | if(NULL == ptr) | ||
1323 | return dmalloc( size ); | ||
1324 | |||
1325 | block = meminfo->block; | ||
1326 | |||
1327 | if(!((size_t)meminfo->block&BLOCK_BIT) && | ||
1328 | (size + sizeof(struct MemInfo) < | ||
1329 | (prevsize = block->top->fragsize) )) { | ||
1330 | /* This is a FRAGMENT and new size is possible to retain within the same | ||
1331 | FRAGMENT */ | ||
1332 | if((prevsize > qinfo[0]) && | ||
1333 | /* this is not the smallest memory Q */ | ||
1334 | (size < (block->top-1)->fragsize)) | ||
1335 | /* this fits in a smaller Q */ | ||
1336 | ; | ||
1337 | else | ||
1338 | mem = ptr; /* Just return the same pointer as we got in. */ | ||
1339 | } | ||
1340 | if(!mem) { | ||
1341 | /* This is a stand-alone BLOCK or a realloc that no longer fits within | ||
1342 | the same FRAGMENT */ | ||
1343 | |||
1344 | if((size_t)meminfo->block&BLOCK_BIT) { | ||
1345 | prevsize = ((size_t)meminfo->block&~BLOCK_BIT) - | ||
1346 | sizeof(struct MemInfo); | ||
1347 | } | ||
1348 | else | ||
1349 | prevsize -= sizeof(struct MemInfo); | ||
1350 | |||
1351 | /* No tricks involved here, just grab a new bite of memory, copy the data | ||
1352 | * from the old place and free the old memory again. */ | ||
1353 | mem = dmalloc(size); | ||
1354 | if(mem) { | ||
1355 | memcpy(mem, ptr, MIN(size, prevsize) ); | ||
1356 | dfree(ptr); | ||
1357 | } | ||
1358 | } | ||
1359 | return mem; | ||
1360 | } | ||
1361 | |||
1362 | /*************************************************************************** | ||
1363 | * | ||
1364 | * dcalloc() | ||
1365 | * | ||
1366 | * This needs no explanation. A calloc() look-alike. | ||
1367 | * | ||
1368 | **************************************************************************/ | ||
1369 | /* Allocate an array of NMEMB elements each SIZE bytes long. | ||
1370 | The entire array is initialized to zeros. */ | ||
1371 | void * | ||
1372 | dcalloc (size_t nmemb, size_t size) | ||
1373 | { | ||
1374 | void *result = dmalloc (nmemb * size); | ||
1375 | |||
1376 | if (result != NULL) | ||
1377 | memset (result, 0, nmemb * size); | ||
1378 | |||
1379 | return result; | ||
1380 | } | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/dmalloc.h b/apps/plugins/pdbox/dbestfit-3.3/dmalloc.h new file mode 100644 index 0000000000..053b3a114b --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/dmalloc.h | |||
@@ -0,0 +1,16 @@ | |||
1 | |||
2 | void *dmalloc(size_t); | ||
3 | void dfree(void *); | ||
4 | void *drealloc(void *, size_t); | ||
5 | |||
6 | #define malloc(x) dmalloc(x) | ||
7 | #define free(x) dfree(x) | ||
8 | #define realloc(x,y) drealloc(x,y) | ||
9 | |||
10 | void *dmalloc(size_t); | ||
11 | void dfree(void *); | ||
12 | void *drealloc(void *, size_t); | ||
13 | |||
14 | #define malloc(x) dmalloc(x) | ||
15 | #define free(x) dfree(x) | ||
16 | #define realloc(x,y) drealloc(x,y) | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/dmytest.c b/apps/plugins/pdbox/dbestfit-3.3/dmytest.c new file mode 100644 index 0000000000..46d4c73efd --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/dmytest.c | |||
@@ -0,0 +1,276 @@ | |||
1 | #include <stdio.h> | ||
2 | #include <stdlib.h> | ||
3 | |||
4 | #include "dmalloc.h" | ||
5 | |||
6 | #define MAX 500 | ||
7 | #define MAX2 1000 | ||
8 | #define MAXC 2 | ||
9 | |||
10 | #define TESTA | ||
11 | #define TESTB | ||
12 | #define TESTC | ||
13 | #define TESTD | ||
14 | |||
15 | int main(int argc, char **argv) | ||
16 | { | ||
17 | int i; | ||
18 | int memory = 0; | ||
19 | |||
20 | #ifdef BMALLOC | ||
21 | #define HEAP 10000 | ||
22 | void *heap = (malloc)(HEAP); | ||
23 | if(!heap) | ||
24 | return -1; | ||
25 | add_pool(heap, HEAP); | ||
26 | #endif | ||
27 | |||
28 | { | ||
29 | #define MAXK 100 | ||
30 | void *wow[MAXK]; | ||
31 | wow[0]=malloc(700); | ||
32 | realloc(wow[0], 680); | ||
33 | return 0; | ||
34 | |||
35 | for(i=0; i<MAXK; i++) | ||
36 | if(!(wow[i]=malloc(412))) { | ||
37 | printf("*** Couldn't allocated memory, exiting\n"); | ||
38 | return -2; | ||
39 | } | ||
40 | for(i=MAXK-1; i>=0; i-=2) | ||
41 | free(wow[i]); | ||
42 | return 0; | ||
43 | } | ||
44 | |||
45 | |||
46 | #ifdef TESTD | ||
47 | { | ||
48 | #define MAXS 10 | ||
49 | #define MAXS1 0 | ||
50 | void *ptr[MAXS]; | ||
51 | |||
52 | for(i=MAXS1; i< MAXS; i++) { | ||
53 | printf("%d malloc(%d)\n", i, i*55); | ||
54 | ptr[i] = malloc (i*55); | ||
55 | } | ||
56 | for(i=MAXS1; i< MAXS; i++) { | ||
57 | void *tmp; | ||
58 | printf("%d realloc(%d)\n", i, i*155); | ||
59 | tmp=realloc(ptr[i], i*155); | ||
60 | if(tmp) | ||
61 | ptr[i] = tmp; | ||
62 | } | ||
63 | for(i=MAXS1; i< MAXS; i++) { | ||
64 | printf("%d free(%d)\n", i, i*155); | ||
65 | free(ptr[i]); | ||
66 | } | ||
67 | } | ||
68 | #endif | ||
69 | |||
70 | #ifdef TESTC | ||
71 | { | ||
72 | void *ptr[MAXC]; | ||
73 | printf("This is test C:\n"); | ||
74 | |||
75 | for(i=0; i< MAXC; i++) { | ||
76 | printf("%d malloc(100)\n", i+1); | ||
77 | ptr[i] = malloc(100); | ||
78 | printf(" ...returned %p\n", ptr[i]); | ||
79 | } | ||
80 | |||
81 | for(i=0; i< MAXC; i++) { | ||
82 | printf("%d free()\n", i+1); | ||
83 | free(ptr[i]); | ||
84 | } | ||
85 | |||
86 | printf("End of test C:\n"); | ||
87 | } | ||
88 | #endif | ||
89 | |||
90 | #ifdef TESTA | ||
91 | { | ||
92 | void *pointers[MAX]; | ||
93 | printf("This is test I:\n"); | ||
94 | |||
95 | for(i=0; i<MAX; i++) { | ||
96 | printf("%d attempts malloc(%d)\n", i, i*6); | ||
97 | pointers[i]=malloc(i*6); | ||
98 | if(!pointers[i]) { | ||
99 | printf("cant get more memory!"); | ||
100 | return(0); | ||
101 | } | ||
102 | memory += (i*6); | ||
103 | } | ||
104 | printf("\namount: %d\n", memory); | ||
105 | memory = 0; | ||
106 | for(i=0; i<MAX; i++) { | ||
107 | printf("%d attempts realloc(%d)\n", i, i*7); | ||
108 | pointers[i]=realloc(pointers[i], i*7); | ||
109 | memory += i*7; | ||
110 | } | ||
111 | printf("\namount: %d\n", memory); | ||
112 | for(i=0; i<MAX; i++) { | ||
113 | printf("%d attempts free(%d)\n", i, i*7); | ||
114 | free(pointers[i]); | ||
115 | } | ||
116 | printf("\nend of test 1\n"); | ||
117 | } | ||
118 | #endif | ||
119 | #ifdef TESTB | ||
120 | { | ||
121 | void *pointers2[MAX2]; | ||
122 | memory = 0; | ||
123 | printf("\nTest II\n"); | ||
124 | for(i=0; i< MAX2; i++) { | ||
125 | /* printf("%d attempts malloc(%d)\n", i, 7); */ | ||
126 | pointers2[i] = malloc(7); | ||
127 | memory += 7; | ||
128 | } | ||
129 | printf("\namount: %d\n", memory); | ||
130 | for(i=0; i< MAX2; i++) { | ||
131 | free(pointers2[i]); | ||
132 | } | ||
133 | printf("\nend of test II\n"); | ||
134 | |||
135 | } | ||
136 | #endif | ||
137 | return 0; | ||
138 | } | ||
139 | #include <stdio.h> | ||
140 | #include <stdlib.h> | ||
141 | |||
142 | #include "dmalloc.h" | ||
143 | |||
144 | #define MAX 500 | ||
145 | #define MAX2 1000 | ||
146 | #define MAXC 2 | ||
147 | |||
148 | #define TESTA | ||
149 | #define TESTB | ||
150 | #define TESTC | ||
151 | #define TESTD | ||
152 | |||
153 | int main(int argc, char **argv) | ||
154 | { | ||
155 | int i; | ||
156 | int memory = 0; | ||
157 | |||
158 | #ifdef BMALLOC | ||
159 | #define HEAP 10000 | ||
160 | void *heap = (malloc)(HEAP); | ||
161 | if(!heap) | ||
162 | return -1; | ||
163 | add_pool(heap, HEAP); | ||
164 | #endif | ||
165 | |||
166 | { | ||
167 | #define MAXK 100 | ||
168 | void *wow[MAXK]; | ||
169 | wow[0]=malloc(700); | ||
170 | realloc(wow[0], 680); | ||
171 | return 0; | ||
172 | |||
173 | for(i=0; i<MAXK; i++) | ||
174 | if(!(wow[i]=malloc(412))) { | ||
175 | printf("*** Couldn't allocated memory, exiting\n"); | ||
176 | return -2; | ||
177 | } | ||
178 | for(i=MAXK-1; i>=0; i-=2) | ||
179 | free(wow[i]); | ||
180 | return 0; | ||
181 | } | ||
182 | |||
183 | |||
184 | #ifdef TESTD | ||
185 | { | ||
186 | #define MAXS 10 | ||
187 | #define MAXS1 0 | ||
188 | void *ptr[MAXS]; | ||
189 | |||
190 | for(i=MAXS1; i< MAXS; i++) { | ||
191 | printf("%d malloc(%d)\n", i, i*55); | ||
192 | ptr[i] = malloc (i*55); | ||
193 | } | ||
194 | for(i=MAXS1; i< MAXS; i++) { | ||
195 | void *tmp; | ||
196 | printf("%d realloc(%d)\n", i, i*155); | ||
197 | tmp=realloc(ptr[i], i*155); | ||
198 | if(tmp) | ||
199 | ptr[i] = tmp; | ||
200 | } | ||
201 | for(i=MAXS1; i< MAXS; i++) { | ||
202 | printf("%d free(%d)\n", i, i*155); | ||
203 | free(ptr[i]); | ||
204 | } | ||
205 | } | ||
206 | #endif | ||
207 | |||
208 | #ifdef TESTC | ||
209 | { | ||
210 | void *ptr[MAXC]; | ||
211 | printf("This is test C:\n"); | ||
212 | |||
213 | for(i=0; i< MAXC; i++) { | ||
214 | printf("%d malloc(100)\n", i+1); | ||
215 | ptr[i] = malloc(100); | ||
216 | printf(" ...returned %p\n", ptr[i]); | ||
217 | } | ||
218 | |||
219 | for(i=0; i< MAXC; i++) { | ||
220 | printf("%d free()\n", i+1); | ||
221 | free(ptr[i]); | ||
222 | } | ||
223 | |||
224 | printf("End of test C:\n"); | ||
225 | } | ||
226 | #endif | ||
227 | |||
228 | #ifdef TESTA | ||
229 | { | ||
230 | void *pointers[MAX]; | ||
231 | printf("This is test I:\n"); | ||
232 | |||
233 | for(i=0; i<MAX; i++) { | ||
234 | printf("%d attempts malloc(%d)\n", i, i*6); | ||
235 | pointers[i]=malloc(i*6); | ||
236 | if(!pointers[i]) { | ||
237 | printf("cant get more memory!"); | ||
238 | return(0); | ||
239 | } | ||
240 | memory += (i*6); | ||
241 | } | ||
242 | printf("\namount: %d\n", memory); | ||
243 | memory = 0; | ||
244 | for(i=0; i<MAX; i++) { | ||
245 | printf("%d attempts realloc(%d)\n", i, i*7); | ||
246 | pointers[i]=realloc(pointers[i], i*7); | ||
247 | memory += i*7; | ||
248 | } | ||
249 | printf("\namount: %d\n", memory); | ||
250 | for(i=0; i<MAX; i++) { | ||
251 | printf("%d attempts free(%d)\n", i, i*7); | ||
252 | free(pointers[i]); | ||
253 | } | ||
254 | printf("\nend of test 1\n"); | ||
255 | } | ||
256 | #endif | ||
257 | #ifdef TESTB | ||
258 | { | ||
259 | void *pointers2[MAX2]; | ||
260 | memory = 0; | ||
261 | printf("\nTest II\n"); | ||
262 | for(i=0; i< MAX2; i++) { | ||
263 | /* printf("%d attempts malloc(%d)\n", i, 7); */ | ||
264 | pointers2[i] = malloc(7); | ||
265 | memory += 7; | ||
266 | } | ||
267 | printf("\namount: %d\n", memory); | ||
268 | for(i=0; i< MAX2; i++) { | ||
269 | free(pointers2[i]); | ||
270 | } | ||
271 | printf("\nend of test II\n"); | ||
272 | |||
273 | } | ||
274 | #endif | ||
275 | return 0; | ||
276 | } | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/malloc.man b/apps/plugins/pdbox/dbestfit-3.3/malloc.man new file mode 100644 index 0000000000..79f6f3ea37 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/malloc.man | |||
@@ -0,0 +1,190 @@ | |||
1 | MALLOC(3V) C LIBRARY FUNCTIONS MALLOC(3V) | ||
2 | |||
3 | |||
4 | NAME | ||
5 | malloc, free, realloc, calloc | ||
6 | |||
7 | SYNOPSIS | ||
8 | #include <malloc.h> | ||
9 | |||
10 | void *malloc(size) | ||
11 | size_t size; | ||
12 | |||
13 | void free(ptr) | ||
14 | void *ptr; | ||
15 | |||
16 | void *realloc(ptr, size) | ||
17 | void *ptr; | ||
18 | size_t size; | ||
19 | |||
20 | void *calloc(nelem, elsize) | ||
21 | size_t nelem; | ||
22 | size_t elsize; | ||
23 | |||
24 | DESCRIPTION | ||
25 | These routines provide a general-purpose memory allocation | ||
26 | package. They maintain a table of free blocks for efficient | ||
27 | allocation and coalescing of free storage. When there is no | ||
28 | suitable space already free, the allocation routines call | ||
29 | rn_getseg() to get more memory from the system. | ||
30 | |||
31 | Each of the allocation routines returns a pointer to space | ||
32 | suitably aligned for storage of any type of object. Each | ||
33 | returns a NULL pointer if the request cannot be completed | ||
34 | (see DIAGNOSTICS). | ||
35 | |||
36 | malloc() returns a pointer to a block of at least size | ||
37 | bytes, which is appropriately aligned. | ||
38 | |||
39 | free() releases a previously allocated block. Its argument | ||
40 | is a pointer to a block previously allocated by malloc(), | ||
41 | calloc() or realloc(). | ||
42 | |||
43 | realloc() changes the size of the block referenced by ptr to | ||
44 | size bytes and returns a pointer to the (possibly moved) | ||
45 | block. The contents will be unchanged up to the lesser of | ||
46 | the new and old sizes. If unable to honor a reallocation | ||
47 | request, realloc() leaves its first argument unaltered. | ||
48 | |||
49 | **** DMALLOC DOES NOT COMPLY WITH THE PARAGRAPH BELOW **** | ||
50 | |||
51 | For backwards compatibility, realloc() accepts a pointer to a | ||
52 | block freed since the most recent call to malloc(), cal- | ||
53 | loc() or realloc(). | ||
54 | |||
55 | Note: using realloc() with a block freed before the most recent | ||
56 | call to malloc(), calloc() or realloc() is an error. | ||
57 | |||
58 | calloc() uses malloc() to allocate space for an array of | ||
59 | nelem elements of size elsize, initializes the space to | ||
60 | zeros, and returns a pointer to the initialized block. The | ||
61 | block should be freed with free(). | ||
62 | |||
63 | |||
64 | malloc() and realloc() return a non- NULL pointer if size is 0, | ||
65 | and calloc() returns a non-NULL pointer if nelem or elsize is 0, | ||
66 | but these pointers should not be dereferenced. | ||
67 | |||
68 | Note: Always cast the value returned by malloc(), realloc() or | ||
69 | calloc(). | ||
70 | |||
71 | |||
72 | RETURN VALUES On success, malloc(), calloc() and realloc() return a | ||
73 | pointer to space suitably aligned for storage of any type of | ||
74 | object. On failure, they return NULL. | ||
75 | |||
76 | free() does not return a value. | ||
77 | |||
78 | |||
79 | NOTES | ||
80 | Because malloc() and realloc() return a non-NULL pointer if size | ||
81 | is 0, and calloc() returns a non-NULL pointer if nelem or elsize | ||
82 | is 0, a zero size need not be treated as a special case if it | ||
83 | should be passed to these functions unpredictably. Also, the | ||
84 | pointer returned by these functions may be passed to subsequent | ||
85 | invocations of realloc(). | ||
86 | |||
87 | |||
88 | BUGS | ||
89 | |||
90 | **** DMALLOC DOES NOT COMPLY WITH THE PARAGRAPH BELOW **** | ||
91 | |||
92 | Since realloc() accepts a pointer to a block freed since the last | ||
93 | call to malloc(), calloc() or realloc(), a degradation of | ||
94 | performance results. The semantics of free() should be changed | ||
95 | so that the contents of a previously freed block are undefined. | ||
96 | MALLOC(3V) C LIBRARY FUNCTIONS MALLOC(3V) | ||
97 | |||
98 | |||
99 | NAME | ||
100 | malloc, free, realloc, calloc | ||
101 | |||
102 | SYNOPSIS | ||
103 | #include <malloc.h> | ||
104 | |||
105 | void *malloc(size) | ||
106 | size_t size; | ||
107 | |||
108 | void free(ptr) | ||
109 | void *ptr; | ||
110 | |||
111 | void *realloc(ptr, size) | ||
112 | void *ptr; | ||
113 | size_t size; | ||
114 | |||
115 | void *calloc(nelem, elsize) | ||
116 | size_t nelem; | ||
117 | size_t elsize; | ||
118 | |||
119 | DESCRIPTION | ||
120 | These routines provide a general-purpose memory allocation | ||
121 | package. They maintain a table of free blocks for efficient | ||
122 | allocation and coalescing of free storage. When there is no | ||
123 | suitable space already free, the allocation routines call | ||
124 | rn_getseg() to get more memory from the system. | ||
125 | |||
126 | Each of the allocation routines returns a pointer to space | ||
127 | suitably aligned for storage of any type of object. Each | ||
128 | returns a NULL pointer if the request cannot be completed | ||
129 | (see DIAGNOSTICS). | ||
130 | |||
131 | malloc() returns a pointer to a block of at least size | ||
132 | bytes, which is appropriately aligned. | ||
133 | |||
134 | free() releases a previously allocated block. Its argument | ||
135 | is a pointer to a block previously allocated by malloc(), | ||
136 | calloc() or realloc(). | ||
137 | |||
138 | realloc() changes the size of the block referenced by ptr to | ||
139 | size bytes and returns a pointer to the (possibly moved) | ||
140 | block. The contents will be unchanged up to the lesser of | ||
141 | the new and old sizes. If unable to honor a reallocation | ||
142 | request, realloc() leaves its first argument unaltered. | ||
143 | |||
144 | **** DMALLOC DOES NOT COMPLY WITH THE PARAGRAPH BELOW **** | ||
145 | |||
146 | For backwards compatibility, realloc() accepts a pointer to a | ||
147 | block freed since the most recent call to malloc(), cal- | ||
148 | loc() or realloc(). | ||
149 | |||
150 | Note: using realloc() with a block freed before the most recent | ||
151 | call to malloc(), calloc() or realloc() is an error. | ||
152 | |||
153 | calloc() uses malloc() to allocate space for an array of | ||
154 | nelem elements of size elsize, initializes the space to | ||
155 | zeros, and returns a pointer to the initialized block. The | ||
156 | block should be freed with free(). | ||
157 | |||
158 | |||
159 | malloc() and realloc() return a non- NULL pointer if size is 0, | ||
160 | and calloc() returns a non-NULL pointer if nelem or elsize is 0, | ||
161 | but these pointers should not be dereferenced. | ||
162 | |||
163 | Note: Always cast the value returned by malloc(), realloc() or | ||
164 | calloc(). | ||
165 | |||
166 | |||
167 | RETURN VALUES On success, malloc(), calloc() and realloc() return a | ||
168 | pointer to space suitably aligned for storage of any type of | ||
169 | object. On failure, they return NULL. | ||
170 | |||
171 | free() does not return a value. | ||
172 | |||
173 | |||
174 | NOTES | ||
175 | Because malloc() and realloc() return a non-NULL pointer if size | ||
176 | is 0, and calloc() returns a non-NULL pointer if nelem or elsize | ||
177 | is 0, a zero size need not be treated as a special case if it | ||
178 | should be passed to these functions unpredictably. Also, the | ||
179 | pointer returned by these functions may be passed to subsequent | ||
180 | invocations of realloc(). | ||
181 | |||
182 | |||
183 | BUGS | ||
184 | |||
185 | **** DMALLOC DOES NOT COMPLY WITH THE PARAGRAPH BELOW **** | ||
186 | |||
187 | Since realloc() accepts a pointer to a block freed since the last | ||
188 | call to malloc(), calloc() or realloc(), a degradation of | ||
189 | performance results. The semantics of free() should be changed | ||
190 | so that the contents of a previously freed block are undefined. | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/mytest.c b/apps/plugins/pdbox/dbestfit-3.3/mytest.c new file mode 100644 index 0000000000..bf338b72ef --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/mytest.c | |||
@@ -0,0 +1,140 @@ | |||
1 | |||
2 | #include <stdio.h> | ||
3 | #include <stdlib.h> | ||
4 | |||
5 | #include "bmalloc.h" | ||
6 | |||
7 | int main(int argc, char **argv) | ||
8 | { | ||
9 | void *pointers[5]; | ||
10 | int i; | ||
11 | void *area; | ||
12 | |||
13 | for(i=0; i<5; i++) | ||
14 | pointers[i] = malloc(8000); | ||
15 | |||
16 | if(argc>1) { | ||
17 | switch(argv[1][0]) { | ||
18 | case '1': | ||
19 | for(i=0; i<5; i++) { | ||
20 | add_pool(pointers[i], 4000); | ||
21 | add_pool((char *)pointers[i]+4000, 4000); | ||
22 | } | ||
23 | break; | ||
24 | case '2': | ||
25 | area = malloc(20000); | ||
26 | add_pool(area, 3000); | ||
27 | add_pool((char *)area+6000, 3000); | ||
28 | add_pool((char *)area+3000, 3000); | ||
29 | add_pool((char *)area+12000, 3000); | ||
30 | add_pool((char *)area+9000, 3000); | ||
31 | break; | ||
32 | case '3': | ||
33 | { | ||
34 | void *ptr[10]; | ||
35 | area = malloc(20000); | ||
36 | add_pool(area, 20000); | ||
37 | |||
38 | printf(" ** TEST USAGE\n"); | ||
39 | for(i=0; i<9; i++) | ||
40 | ptr[i]=bmalloc(200); | ||
41 | print_lists(); | ||
42 | for(i=0; i<9; i++) | ||
43 | bfree(ptr[i]); | ||
44 | printf(" ** END OF TEST USAGE\n"); | ||
45 | } | ||
46 | |||
47 | break; | ||
48 | case '4': | ||
49 | { | ||
50 | void *ptr[10]; | ||
51 | area = malloc(20000); | ||
52 | add_pool(area, 20000); | ||
53 | |||
54 | ptr[0]=bmalloc(4080); | ||
55 | print_lists(); | ||
56 | bfree(ptr[0]); | ||
57 | printf(" ** END OF TEST USAGE\n"); | ||
58 | } | ||
59 | |||
60 | break; | ||
61 | } | ||
62 | } | ||
63 | else | ||
64 | for(i=4; i>=0; i--) | ||
65 | add_pool(pointers[i], 8000-i*100); | ||
66 | |||
67 | print_lists(); | ||
68 | |||
69 | return 0; | ||
70 | } | ||
71 | |||
72 | #include <stdio.h> | ||
73 | #include <stdlib.h> | ||
74 | |||
75 | #include "bmalloc.h" | ||
76 | |||
77 | int main(int argc, char **argv) | ||
78 | { | ||
79 | void *pointers[5]; | ||
80 | int i; | ||
81 | void *area; | ||
82 | |||
83 | for(i=0; i<5; i++) | ||
84 | pointers[i] = malloc(8000); | ||
85 | |||
86 | if(argc>1) { | ||
87 | switch(argv[1][0]) { | ||
88 | case '1': | ||
89 | for(i=0; i<5; i++) { | ||
90 | add_pool(pointers[i], 4000); | ||
91 | add_pool((char *)pointers[i]+4000, 4000); | ||
92 | } | ||
93 | break; | ||
94 | case '2': | ||
95 | area = malloc(20000); | ||
96 | add_pool(area, 3000); | ||
97 | add_pool((char *)area+6000, 3000); | ||
98 | add_pool((char *)area+3000, 3000); | ||
99 | add_pool((char *)area+12000, 3000); | ||
100 | add_pool((char *)area+9000, 3000); | ||
101 | break; | ||
102 | case '3': | ||
103 | { | ||
104 | void *ptr[10]; | ||
105 | area = malloc(20000); | ||
106 | add_pool(area, 20000); | ||
107 | |||
108 | printf(" ** TEST USAGE\n"); | ||
109 | for(i=0; i<9; i++) | ||
110 | ptr[i]=bmalloc(200); | ||
111 | print_lists(); | ||
112 | for(i=0; i<9; i++) | ||
113 | bfree(ptr[i]); | ||
114 | printf(" ** END OF TEST USAGE\n"); | ||
115 | } | ||
116 | |||
117 | break; | ||
118 | case '4': | ||
119 | { | ||
120 | void *ptr[10]; | ||
121 | area = malloc(20000); | ||
122 | add_pool(area, 20000); | ||
123 | |||
124 | ptr[0]=bmalloc(4080); | ||
125 | print_lists(); | ||
126 | bfree(ptr[0]); | ||
127 | printf(" ** END OF TEST USAGE\n"); | ||
128 | } | ||
129 | |||
130 | break; | ||
131 | } | ||
132 | } | ||
133 | else | ||
134 | for(i=4; i>=0; i--) | ||
135 | add_pool(pointers[i], 8000-i*100); | ||
136 | |||
137 | print_lists(); | ||
138 | |||
139 | return 0; | ||
140 | } | ||
diff --git a/apps/plugins/pdbox/dbestfit-3.3/thoughts b/apps/plugins/pdbox/dbestfit-3.3/thoughts new file mode 100644 index 0000000000..8dbd8b9979 --- /dev/null +++ b/apps/plugins/pdbox/dbestfit-3.3/thoughts | |||
@@ -0,0 +1,340 @@ | |||
1 | ===================================== | ||
2 | Memory Allocation Algorithm Theories. | ||
3 | ===================================== | ||
4 | |||
5 | GOAL | ||
6 | It is intended to be a 100% working memory allocation system. It should be | ||
7 | capable of replacing an ordinary Operating System's own routines. It should | ||
8 | work good in a multitasking, shared memory, non-virtual memory environment | ||
9 | without clogging the memory. Primary aimed for small machines, CPUs and | ||
10 | memory amounts. | ||
11 | |||
12 | I use a best-fit algorithm with a slight overhead in order to increase speed | ||
13 | a lot. It should remain scalable and work good with very large amount of | ||
14 | memory and free/used memory blocks too. | ||
15 | |||
16 | TERMINOLOGY | ||
17 | |||
18 | FRAGMENT - small identically sized parts of a larger BLOCK, they are when | ||
19 | travered in lists etc _not_ allocated. | ||
20 | BLOCK - large memory area, if used for FRAGMENTS, they are linked in a | ||
21 | lists. One list for each FRAGMENT size supported. | ||
22 | TOP - head struct that holds information about and points to a chain | ||
23 | of BLOCKS for a particular FRAGMENT size. | ||
24 | CHUNK - a contiguous area of free memory | ||
25 | |||
26 | MEMORY SYSTEM | ||
27 | |||
28 | We split the system in two parts. One part allocates small memory amounts | ||
29 | and one part allocates large memory amounts, but all allocations are done | ||
30 | "through" the small-part-system. There is an option to use only the small | ||
31 | system (and thus use the OS for large blocks) or the complete package. | ||
32 | |||
33 | ############################################################################## | ||
34 | SMALL SIZE ALLOCATIONS | ||
35 | ############################################################################## | ||
36 | |||
37 | Keywords for this system is 'Deferred Coalescing' and 'quick lists'. | ||
38 | |||
39 | ALLOC | ||
40 | |||
41 | * Small allocations are "aligned" upwards to a set of preset sizes. In the | ||
42 | current implementation I use 20, 28, 52, 116, 312, 580, 812, 2028 bytes. | ||
43 | Memory allocations of these sizes are refered to as FRAGMENTS. | ||
44 | (The reason for these specific sizes is the requirement that they must be | ||
45 | 32-bit aligned and fit as good as possible within 4060 bytes.) | ||
46 | |||
47 | * Allocations larger than 2028 will get a BLOCK for that allocation only. | ||
48 | |||
49 | * Each of these sizes has it's own TOP. When a FRAGMENT is requested, a | ||
50 | larger BLOCK will be allocated and divided into many FRAGMENTS (all of the | ||
51 | same size). TOP points to a list with BLOCKS that contains FRAGMENTS of | ||
52 | the same size. Each BLOCK has a 'number of free FRAGMENTS' counter and so | ||
53 | has each TOP (for the entire chain). | ||
54 | |||
55 | * A BLOCK is around 4060 bytes plus the size of the information header. This | ||
56 | size is adjusted to make the allocation of the big block not require more | ||
57 | than 4096 bytes. (This might not be so easy to be sure of, if you don't | ||
58 | know how the big-block system works, but the BMALLOC system uses an | ||
59 | extra header of 12 bytes and the header for the FRAGMENT BLOCK is 20 bytes | ||
60 | in a general 32-bit unix environment.) | ||
61 | |||
62 | * In case the allocation of a BLOCK fails when a FRAGMENT is required, the | ||
63 | next size of FRAGMENTS will be checked for a free FRAGMENT. First when the | ||
64 | larger size lists have been tested without success it will fail for real. | ||
65 | |||
66 | FREE | ||
67 | |||
68 | * When FRAGMENTS are freed so that a BLOCK becomes non-used, it is returned | ||
69 | to the system. | ||
70 | |||
71 | * FREEing a fragment adds the buffer in a LIFO-order. That means that the | ||
72 | next request for a fragment from the same list, the last freed buffer will | ||
73 | be returned first. | ||
74 | |||
75 | REALLOC | ||
76 | |||
77 | * REALLOCATION of a FRAGMENT does first check if the new size would fit | ||
78 | within the same FRAGMENT and if it would use the same FRAGMENT size. If it | ||
79 | does and would, the same pointer is returned. | ||
80 | |||
81 | OVERHEAD | ||
82 | |||
83 | Yes, there is an overhead on small allocations (internal fragmentation). | ||
84 | Yet, I do believe that small allocations more often than larger ones are | ||
85 | used dynamically. I believe that a large overhead is not a big problem if it | ||
86 | remains only for a while. The big gain is with the extreme speed we can GET | ||
87 | and RETURN small allocations. This has yet to be proven. I am open to other | ||
88 | systems of dealing with the small ones, but I don`t believe in using the | ||
89 | same system for all sizes of allocations. | ||
90 | |||
91 | IMPROVEMENT | ||
92 | |||
93 | An addition to the above described algorithm is the `save-empty-BLOCKS-a- | ||
94 | while-afterwards`. It will be used when the last used FRAGMENT within a | ||
95 | BLOCK is freed. The BLOCK will then not get returned to the system until "a | ||
96 | few more" FRAGMENTS have been freed in case the last [few] freed FRAGMENTS | ||
97 | are allocated yet again (and thus prevent the huge overhead of making | ||
98 | FRAGMENTS in a BLOCK). The "only" drawback of such a SEBAWA concept is | ||
99 | that it would mean an even bigger overhead... | ||
100 | |||
101 | HEADERS (in allocated data) | ||
102 | |||
103 | FRAGMENTS - 32-bit pointer to its parent BLOCK (lowest bit must be 0) | ||
104 | BLOCK - 32-bit size (lowest bit must be 1 to separate this from | ||
105 | FRAGMENTS) | ||
106 | |||
107 | ############################################################################## | ||
108 | LARGER ALLOCATIONS | ||
109 | ############################################################################## | ||
110 | |||
111 | If the requested size is larger than the largest FRAGMENT size supported, | ||
112 | the allocation will be made for this memory area alone, or if a BLOCK is | ||
113 | allocated to fit lots of FRAGMENTS a large block is also desired. | ||
114 | |||
115 | * We add memory to the "system" with the add_pool() function call. It | ||
116 | specifies the start and size of the new block of memory that will be | ||
117 | used in this memory allocation system. Several add_pool() calls are | ||
118 | supported and they may or may not add contiguous memory. | ||
119 | |||
120 | * Make all blocks get allocated aligned to BLOCKSIZE (sometimes referred to | ||
121 | as 'grain size'), 64 bytes in my implementation. Reports tell us there is | ||
122 | no real gain in increasing the size of the align. | ||
123 | |||
124 | * We link *all* pieces of memory (AREAS), free or not free. We keep the list | ||
125 | in address order and thus when a FREE() occurs we know instanstly if there | ||
126 | are FREE CHUNKS wall-to-wall. No list "travels" needed. Requires some | ||
127 | extra space in every allocated BLOCK. Still needs to put the new CHUNK in | ||
128 | the right place in size-sorted list/tree. All memory areas, allocated or | ||
129 | not, contain the following header: | ||
130 | - size of this memory area | ||
131 | - FREE status | ||
132 | - pointer to the next AREA closest in memory | ||
133 | - pointer to the prev AREA closest in memory | ||
134 | (12 bytes) | ||
135 | |||
136 | * Sort all FREE CHUNKS in size-order. We use a SPLAY TREE algorithm for | ||
137 | maximum speed. Data/structs used for the size-sorting functions are kept | ||
138 | in an abstraction layer away from this since it is really not changing | ||
139 | anything (except executing speed). | ||
140 | |||
141 | ALLOC (RSIZE - requested size, aligned properly) | ||
142 | |||
143 | * Fetch a CHUNK that RSIZE fits within. If the found CHUNK is larger than | ||
144 | RSIZE, split it and return the RSIZE to the caller. Link the new CHUNK | ||
145 | into the list/tree. | ||
146 | |||
147 | FREE (AREA - piece of memory that is returned to the system) | ||
148 | |||
149 | * Since the allocated BLOCK has kept its link-pointers, we can without | ||
150 | checking any list instantly see if there are any FREE CHUNKS that are | ||
151 | wall-to-wall with the AREA (both sides). If the AREA *is* wall-to-wall | ||
152 | with one or two CHUNKS that or they are unlinked from the lists, enlarged | ||
153 | and re-linked into the lists. | ||
154 | |||
155 | REALLOC | ||
156 | |||
157 | * There IS NO realloc() of large blocks, they are performed in the higher | ||
158 | layer (dmalloc). | ||
159 | |||
160 | |||
161 | ############################################################################## | ||
162 | FURTHER READING | ||
163 | ############################################################################## | ||
164 | |||
165 | * "Dynamic Storage Allocation: A Survey and Critical Review" (Paul R. Wilson, | ||
166 | Mark S. Johnstone, Michael Neely, David Boles) | ||
167 | ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps | ||
168 | |||
169 | * "A Memory Allocator" (Doug Lea) | ||
170 | http://g.oswego.edu/dl/html/malloc.html | ||
171 | ===================================== | ||
172 | Memory Allocation Algorithm Theories. | ||
173 | ===================================== | ||
174 | |||
175 | GOAL | ||
176 | It is intended to be a 100% working memory allocation system. It should be | ||
177 | capable of replacing an ordinary Operating System's own routines. It should | ||
178 | work good in a multitasking, shared memory, non-virtual memory environment | ||
179 | without clogging the memory. Primary aimed for small machines, CPUs and | ||
180 | memory amounts. | ||
181 | |||
182 | I use a best-fit algorithm with a slight overhead in order to increase speed | ||
183 | a lot. It should remain scalable and work good with very large amount of | ||
184 | memory and free/used memory blocks too. | ||
185 | |||
186 | TERMINOLOGY | ||
187 | |||
188 | FRAGMENT - small identically sized parts of a larger BLOCK, they are when | ||
189 | travered in lists etc _not_ allocated. | ||
190 | BLOCK - large memory area, if used for FRAGMENTS, they are linked in a | ||
191 | lists. One list for each FRAGMENT size supported. | ||
192 | TOP - head struct that holds information about and points to a chain | ||
193 | of BLOCKS for a particular FRAGMENT size. | ||
194 | CHUNK - a contiguous area of free memory | ||
195 | |||
196 | MEMORY SYSTEM | ||
197 | |||
198 | We split the system in two parts. One part allocates small memory amounts | ||
199 | and one part allocates large memory amounts, but all allocations are done | ||
200 | "through" the small-part-system. There is an option to use only the small | ||
201 | system (and thus use the OS for large blocks) or the complete package. | ||
202 | |||
203 | ############################################################################## | ||
204 | SMALL SIZE ALLOCATIONS | ||
205 | ############################################################################## | ||
206 | |||
207 | Keywords for this system is 'Deferred Coalescing' and 'quick lists'. | ||
208 | |||
209 | ALLOC | ||
210 | |||
211 | * Small allocations are "aligned" upwards to a set of preset sizes. In the | ||
212 | current implementation I use 20, 28, 52, 116, 312, 580, 812, 2028 bytes. | ||
213 | Memory allocations of these sizes are refered to as FRAGMENTS. | ||
214 | (The reason for these specific sizes is the requirement that they must be | ||
215 | 32-bit aligned and fit as good as possible within 4060 bytes.) | ||
216 | |||
217 | * Allocations larger than 2028 will get a BLOCK for that allocation only. | ||
218 | |||
219 | * Each of these sizes has it's own TOP. When a FRAGMENT is requested, a | ||
220 | larger BLOCK will be allocated and divided into many FRAGMENTS (all of the | ||
221 | same size). TOP points to a list with BLOCKS that contains FRAGMENTS of | ||
222 | the same size. Each BLOCK has a 'number of free FRAGMENTS' counter and so | ||
223 | has each TOP (for the entire chain). | ||
224 | |||
225 | * A BLOCK is around 4060 bytes plus the size of the information header. This | ||
226 | size is adjusted to make the allocation of the big block not require more | ||
227 | than 4096 bytes. (This might not be so easy to be sure of, if you don't | ||
228 | know how the big-block system works, but the BMALLOC system uses an | ||
229 | extra header of 12 bytes and the header for the FRAGMENT BLOCK is 20 bytes | ||
230 | in a general 32-bit unix environment.) | ||
231 | |||
232 | * In case the allocation of a BLOCK fails when a FRAGMENT is required, the | ||
233 | next size of FRAGMENTS will be checked for a free FRAGMENT. First when the | ||
234 | larger size lists have been tested without success it will fail for real. | ||
235 | |||
236 | FREE | ||
237 | |||
238 | * When FRAGMENTS are freed so that a BLOCK becomes non-used, it is returned | ||
239 | to the system. | ||
240 | |||
241 | * FREEing a fragment adds the buffer in a LIFO-order. That means that the | ||
242 | next request for a fragment from the same list, the last freed buffer will | ||
243 | be returned first. | ||
244 | |||
245 | REALLOC | ||
246 | |||
247 | * REALLOCATION of a FRAGMENT does first check if the new size would fit | ||
248 | within the same FRAGMENT and if it would use the same FRAGMENT size. If it | ||
249 | does and would, the same pointer is returned. | ||
250 | |||
251 | OVERHEAD | ||
252 | |||
253 | Yes, there is an overhead on small allocations (internal fragmentation). | ||
254 | Yet, I do believe that small allocations more often than larger ones are | ||
255 | used dynamically. I believe that a large overhead is not a big problem if it | ||
256 | remains only for a while. The big gain is with the extreme speed we can GET | ||
257 | and RETURN small allocations. This has yet to be proven. I am open to other | ||
258 | systems of dealing with the small ones, but I don`t believe in using the | ||
259 | same system for all sizes of allocations. | ||
260 | |||
261 | IMPROVEMENT | ||
262 | |||
263 | An addition to the above described algorithm is the `save-empty-BLOCKS-a- | ||
264 | while-afterwards`. It will be used when the last used FRAGMENT within a | ||
265 | BLOCK is freed. The BLOCK will then not get returned to the system until "a | ||
266 | few more" FRAGMENTS have been freed in case the last [few] freed FRAGMENTS | ||
267 | are allocated yet again (and thus prevent the huge overhead of making | ||
268 | FRAGMENTS in a BLOCK). The "only" drawback of such a SEBAWA concept is | ||
269 | that it would mean an even bigger overhead... | ||
270 | |||
271 | HEADERS (in allocated data) | ||
272 | |||
273 | FRAGMENTS - 32-bit pointer to its parent BLOCK (lowest bit must be 0) | ||
274 | BLOCK - 32-bit size (lowest bit must be 1 to separate this from | ||
275 | FRAGMENTS) | ||
276 | |||
277 | ############################################################################## | ||
278 | LARGER ALLOCATIONS | ||
279 | ############################################################################## | ||
280 | |||
281 | If the requested size is larger than the largest FRAGMENT size supported, | ||
282 | the allocation will be made for this memory area alone, or if a BLOCK is | ||
283 | allocated to fit lots of FRAGMENTS a large block is also desired. | ||
284 | |||
285 | * We add memory to the "system" with the add_pool() function call. It | ||
286 | specifies the start and size of the new block of memory that will be | ||
287 | used in this memory allocation system. Several add_pool() calls are | ||
288 | supported and they may or may not add contiguous memory. | ||
289 | |||
290 | * Make all blocks get allocated aligned to BLOCKSIZE (sometimes referred to | ||
291 | as 'grain size'), 64 bytes in my implementation. Reports tell us there is | ||
292 | no real gain in increasing the size of the align. | ||
293 | |||
294 | * We link *all* pieces of memory (AREAS), free or not free. We keep the list | ||
295 | in address order and thus when a FREE() occurs we know instanstly if there | ||
296 | are FREE CHUNKS wall-to-wall. No list "travels" needed. Requires some | ||
297 | extra space in every allocated BLOCK. Still needs to put the new CHUNK in | ||
298 | the right place in size-sorted list/tree. All memory areas, allocated or | ||
299 | not, contain the following header: | ||
300 | - size of this memory area | ||
301 | - FREE status | ||
302 | - pointer to the next AREA closest in memory | ||
303 | - pointer to the prev AREA closest in memory | ||
304 | (12 bytes) | ||
305 | |||
306 | * Sort all FREE CHUNKS in size-order. We use a SPLAY TREE algorithm for | ||
307 | maximum speed. Data/structs used for the size-sorting functions are kept | ||
308 | in an abstraction layer away from this since it is really not changing | ||
309 | anything (except executing speed). | ||
310 | |||
311 | ALLOC (RSIZE - requested size, aligned properly) | ||
312 | |||
313 | * Fetch a CHUNK that RSIZE fits within. If the found CHUNK is larger than | ||
314 | RSIZE, split it and return the RSIZE to the caller. Link the new CHUNK | ||
315 | into the list/tree. | ||
316 | |||
317 | FREE (AREA - piece of memory that is returned to the system) | ||
318 | |||
319 | * Since the allocated BLOCK has kept its link-pointers, we can without | ||
320 | checking any list instantly see if there are any FREE CHUNKS that are | ||
321 | wall-to-wall with the AREA (both sides). If the AREA *is* wall-to-wall | ||
322 | with one or two CHUNKS that or they are unlinked from the lists, enlarged | ||
323 | and re-linked into the lists. | ||
324 | |||
325 | REALLOC | ||
326 | |||
327 | * There IS NO realloc() of large blocks, they are performed in the higher | ||
328 | layer (dmalloc). | ||
329 | |||
330 | |||
331 | ############################################################################## | ||
332 | FURTHER READING | ||
333 | ############################################################################## | ||
334 | |||
335 | * "Dynamic Storage Allocation: A Survey and Critical Review" (Paul R. Wilson, | ||
336 | Mark S. Johnstone, Michael Neely, David Boles) | ||
337 | ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps | ||
338 | |||
339 | * "A Memory Allocator" (Doug Lea) | ||
340 | http://g.oswego.edu/dl/html/malloc.html | ||