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author | Michael Sevakis <jethead71@rockbox.org> | 2014-04-28 09:15:06 -0400 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2014-05-09 23:14:58 +0200 |
commit | 355b5406fafe0d45285e70a0b01d5e674d6a2c16 (patch) | |
tree | b17e42d8e36182280cf7399c9063a6db8b2f4fc9 /firmware | |
parent | f444ae70ebe9c978818bf473d176538244b4559e (diff) | |
download | rockbox-355b5406fafe0d45285e70a0b01d5e674d6a2c16.tar.gz rockbox-355b5406fafe0d45285e70a0b01d5e674d6a2c16.zip |
Make errno a thread-local variable.
errno is supposed to be thread local and we do that here in a rather
makeshift way by implementing a function that returns a pointer to
the __errno variable in the thread block.
If more serious TLS is required, perhaps it would be worthwhile
implementing it using the linker and the "__thread" storage attribute.
That's a bit overkill just for this. I'm also not liking what I saw
the compiler producing.
Change-Id: I03bc0bd6a89f6e3d6bae7653284ee01054614f9a
Reviewed-on: http://gerrit.rockbox.org/803
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested: Michael Sevakis <jethead71@rockbox.org>
Diffstat (limited to 'firmware')
-rw-r--r-- | firmware/kernel/include/thread.h | 1 | ||||
-rw-r--r-- | firmware/libc/errno.c | 6 | ||||
-rw-r--r-- | firmware/libc/include/errno.h | 6 |
3 files changed, 10 insertions, 3 deletions
diff --git a/firmware/kernel/include/thread.h b/firmware/kernel/include/thread.h index 9cc33b23ae..8c13b462e6 100644 --- a/firmware/kernel/include/thread.h +++ b/firmware/kernel/include/thread.h | |||
@@ -210,6 +210,7 @@ struct thread_entry | |||
210 | volatile intptr_t retval; /* Return value from a blocked operation/ | 210 | volatile intptr_t retval; /* Return value from a blocked operation/ |
211 | misc. use */ | 211 | misc. use */ |
212 | #endif | 212 | #endif |
213 | int __errno; /* Thread error number (errno tls) */ | ||
213 | #ifdef HAVE_PRIORITY_SCHEDULING | 214 | #ifdef HAVE_PRIORITY_SCHEDULING |
214 | /* Priority summary of owned objects that support inheritance */ | 215 | /* Priority summary of owned objects that support inheritance */ |
215 | struct blocker *blocker; /* Pointer to blocker when this thread is blocked | 216 | struct blocker *blocker; /* Pointer to blocker when this thread is blocked |
diff --git a/firmware/libc/errno.c b/firmware/libc/errno.c index 6e7bb62b51..2e3cd9083e 100644 --- a/firmware/libc/errno.c +++ b/firmware/libc/errno.c | |||
@@ -1 +1,5 @@ | |||
1 | int errno; | 1 | #include "thread.h" |
2 | int * __errno(void) | ||
3 | { | ||
4 | return &thread_self_entry()->__errno; | ||
5 | } | ||
diff --git a/firmware/libc/include/errno.h b/firmware/libc/include/errno.h index 6a24a1938f..9df261db9f 100644 --- a/firmware/libc/include/errno.h +++ b/firmware/libc/include/errno.h | |||
@@ -10,10 +10,12 @@ | |||
10 | 10 | ||
11 | #ifndef _SYS_ERRNO_H_ | 11 | #ifndef _SYS_ERRNO_H_ |
12 | 12 | ||
13 | extern int * __errno(void); | ||
14 | |||
13 | #ifdef PLUGIN | 15 | #ifdef PLUGIN |
14 | #define errno (*rb->__errno) | 16 | #define errno (*rb->__errno()) |
15 | #else | 17 | #else |
16 | extern int errno; | 18 | #define errno (*__errno()) |
17 | #endif | 19 | #endif |
18 | 20 | ||
19 | #define EPERM 1 /* Not super-user */ | 21 | #define EPERM 1 /* Not super-user */ |