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Made unix mutexes recursive.

This commit is contained in:
Ryan C. Gordon 2005-09-20 04:01:36 +00:00
parent a1208dae33
commit c28540fe89
2 changed files with 41 additions and 7 deletions
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2
CHANGELOG
View File

@ -2,6 +2,8 @@
* CHANGELOG.
*/
09192005 - Make unix mutexes recursive above pthread layer...fixes deadlock on
MacOS X, for now.
09182005 - API BREAKAGE: PHYSFS_enumerateFilesCallback() now passes the
original directory name back to the app in the callback. This
API was only in 1.1.0, and wasn't promised to be stable at this

46
platform/unix.c
View File

@ -466,6 +466,13 @@ void __PHYSFS_platformReleaseMutex(void *mutex) {}
#else
typedef struct
{
pthread_mutex_t mutex;
pthread_t owner;
PHYSFS_uint32 count;
} PthreadMutex;
/* Just in case; this is a panic value. */
#if ((!defined SIZEOF_INT) || (SIZEOF_INT <= 0))
# define SIZEOF_INT 4
@ -490,36 +497,61 @@ PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)
void *__PHYSFS_platformCreateMutex(void)
{
int rc;
pthread_mutex_t *m;
m = (pthread_mutex_t *) allocator.Malloc(sizeof (pthread_mutex_t));
PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));
BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, NULL);
rc = pthread_mutex_init(m, NULL);
rc = pthread_mutex_init(&m->mutex, NULL);
if (rc != 0)
{
allocator.Free(m);
BAIL_MACRO(strerror(rc), NULL);
} /* if */
m->count = 0;
m->owner = (pthread_t) 0xDEADBEEF;
return((void *) m);
} /* __PHYSFS_platformCreateMutex */
void __PHYSFS_platformDestroyMutex(void *mutex)
{
pthread_mutex_destroy((pthread_mutex_t *) mutex);
allocator.Free(mutex);
PthreadMutex *m = (PthreadMutex *) mutex;
/* Destroying a locked mutex is a bug, but we'll try to be helpful. */
if ((m->owner == pthread_self()) && (m->count > 0))
pthread_mutex_unlock(&m->mutex);
pthread_mutex_destroy(&m->mutex);
allocator.Free(m);
} /* __PHYSFS_platformDestroyMutex */
int __PHYSFS_platformGrabMutex(void *mutex)
{
return(pthread_mutex_lock((pthread_mutex_t *) mutex) == 0);
PthreadMutex *m = (PthreadMutex *) mutex;
pthread_t tid = pthread_self();
if (m->owner != tid)
{
if (pthread_mutex_lock(&m->mutex) != 0)
return(0);
m->owner = tid;
} /* if */
m->count++;
return(1);
} /* __PHYSFS_platformGrabMutex */
void __PHYSFS_platformReleaseMutex(void *mutex)
{
pthread_mutex_unlock((pthread_mutex_t *) mutex);
PthreadMutex *m = (PthreadMutex *) mutex;
if (m->owner == pthread_self())
{
if (--m->count == 0)
{
m->owner = (pthread_t) 0xDEADBEEF;
pthread_mutex_unlock(&m->mutex);
} /* if */
} /* if */
} /* __PHYSFS_platformReleaseMutex */
#endif /* !PHYSFS_NO_PTHREADS_SUPPORT */