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struct lock_s *next;
} *locks = NULL;
static of_mutex_t mutex;
OF_CONSTRUCTOR()
{
if (!of_mutex_new(&mutex))
if (of_mutex_new(&mutex) != 0)
OBJC_ERROR("Failed to create mutex!");
}
#endif
int
objc_sync_enter(id object)
{
if (object == nil)
return 0;
#ifdef OF_HAVE_THREADS
struct lock_s *lock;
if (!of_mutex_lock(&mutex))
if (of_mutex_lock(&mutex) != 0)
OBJC_ERROR("Failed to lock mutex!");
/* Look if we already have a lock */
for (lock = locks; lock != NULL; lock = lock->next) {
if (lock->object != object)
continue;
lock->count++;
if (!of_mutex_unlock(&mutex))
if (of_mutex_unlock(&mutex) != 0)
OBJC_ERROR("Failed to unlock mutex!");
if (!of_rmutex_lock(&lock->rmutex))
if (of_rmutex_lock(&lock->rmutex) != 0)
OBJC_ERROR("Failed to lock mutex!");
return 0;
}
/* Create a new lock */
if ((lock = malloc(sizeof(*lock))) == NULL)
OBJC_ERROR("Failed to allocate memory for mutex!");
if (!of_rmutex_new(&lock->rmutex))
if (of_rmutex_new(&lock->rmutex) != 0)
OBJC_ERROR("Failed to create mutex!");
lock->object = object;
lock->count = 1;
lock->next = locks;
locks = lock;
if (!of_mutex_unlock(&mutex))
if (of_mutex_unlock(&mutex) != 0)
OBJC_ERROR("Failed to unlock mutex!");
if (!of_rmutex_lock(&lock->rmutex))
if (of_rmutex_lock(&lock->rmutex) != 0)
OBJC_ERROR("Failed to lock mutex!");
#endif
return 0;
}
int
objc_sync_exit(id object)
{
if (object == nil)
return 0;
#ifdef OF_HAVE_THREADS
struct lock_s *lock, *last = NULL;
if (!of_mutex_lock(&mutex))
if (of_mutex_lock(&mutex) != 0)
OBJC_ERROR("Failed to lock mutex!");
for (lock = locks; lock != NULL; lock = lock->next) {
if (lock->object != object) {
last = lock;
continue;
}
if (!of_rmutex_unlock(&lock->rmutex))
if (of_rmutex_unlock(&lock->rmutex) != 0)
OBJC_ERROR("Failed to unlock mutex!");
if (--lock->count == 0) {
if (!of_rmutex_free(&lock->rmutex))
if (of_rmutex_free(&lock->rmutex) != 0)
OBJC_ERROR("Failed to destroy mutex!");
if (last != NULL)
last->next = lock->next;
if (locks == lock)
locks = lock->next;
free(lock);
}
if (!of_mutex_unlock(&mutex))
if (of_mutex_unlock(&mutex) != 0)
OBJC_ERROR("Failed to unlock mutex!");
return 0;
}
OBJC_ERROR("objc_sync_exit() was called for an object not locked!");
#else
return 0;
#endif
}
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