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>

1 files changed, 3 insertions, 3 deletions

diff --git a/apps/plugin.h b/apps/plugin.h
index 6a15f86919..fd4e468b91 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -160,12 +160,12 @@ void* plugin_get_buffer(size_t *buffer_size);
 #define PLUGIN_MAGIC 0x526F634B /* RocK */
 
 /* increase this every time the api struct changes */
-#define PLUGIN_API_VERSION 229
+#define PLUGIN_API_VERSION 230
 
 /* update this to latest version if a change to the api struct breaks
    backwards compatibility (and please take the opportunity to sort in any
    new function which are "waiting" at the end of the function table) */
-#define PLUGIN_MIN_API_VERSION 228
+#define PLUGIN_MIN_API_VERSION 230
 
 /* plugin return codes */
 /* internal returns start at 0x100 to make exit(1..255) work */
@@ -829,7 +829,7 @@ struct plugin_api {
 
     /* misc */
 #if (CONFIG_PLATFORM & PLATFORM_NATIVE)
-    int* __errno;
+    int * (*__errno)(void);
 #endif
     void (*srand)(unsigned int seed);
     int  (*rand)(void);