// Deletes a pthread_key_t. note that the standard mandates that this does
// not call the destructors for non-NULL key values. Instead, it is the
// responsibility of the caller to properly dispose of the corresponding data
// and resources, using any means it finds suitable.
int pthread_key_delete(pthread_key_t key) {
ScopedTlsMapAccess tls_map;
if (!IsValidUserKey(key) || !tls_map.IsInUse(key)) {
return EINVAL;
}
// Clear value in all threads.
pthread_mutex_lock(&g_thread_list_lock);
for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) {
// Skip zombie threads. They don't have a valid TLS area any more.
// Similarly, it is possible to have t->tls == NULL for threads that
// were just recently created through pthread_create() but whose
// startup trampoline (__pthread_start) hasn't been run yet by the
// scheduler. t->tls will also be NULL after a thread's stack has been
// unmapped but before the ongoing pthread_join() is finished.
if (t->tid == 0 || t->tls == NULL) {
continue;
}
t->tls[key] = NULL;
}
tls_map.DeleteKey(key);
pthread_mutex_unlock(&g_thread_list_lock);
return 0;
}
// Deletes a pthread_key_t. note that the standard mandates that this does
// not call the destructors for non-NULL key values. Instead, it is the
// responsibility of the caller to properly dispose of the corresponding data
// and resources, using any means it finds suitable.
int pthread_key_delete(pthread_key_t key) {
ScopedTlsMapAccess tls_map;
if (!IsValidUserKey(key) || !tls_map.IsInUse(key)) {
return EINVAL;
}
// Clear value in all threads.
pthread_mutex_lock(&gThreadListLock);
for (pthread_internal_t* t = gThreadList; t != NULL; t = t->next) {
// Avoid zombie threads with a negative 'join_count'. These are really
// already dead and don't have a TLS area anymore.
// Similarly, it is possible to have t->tls == NULL for threads that
// were just recently created through pthread_create() but whose
// startup trampoline (__thread_entry) hasn't been run yet by the
// scheduler. t->tls will also be NULL after it's stack has been
// unmapped but before the ongoing pthread_join() is finished.
// so check for this too.
if (t->join_count < 0 || !t->tls) {
continue;
}
t->tls[key] = NULL;
}
tls_map.DeleteKey(key);
pthread_mutex_unlock(&gThreadListLock);
return 0;
}
int pthread_setspecific(pthread_key_t key, const void* ptr) {
ScopedTlsMapAccess tls_map;
if (!IsValidUserKey(key) || !tls_map.IsInUse(key)) {
return EINVAL;
}
__get_tls()[key] = const_cast<void*>(ptr);
return 0;
}
int pthread_setspecific(pthread_key_t key, const void* ptr) {
ScopedTlsMapAccess tls_map;
if (!IsValidUserKey(key) || !tls_map.IsInUse(key)) {
return EINVAL;
}
((uint32_t *)__get_tls())[key] = (uint32_t)ptr;
return 0;
}
void* pthread_getspecific(pthread_key_t key) {
if (!IsValidUserKey(key)) {
return NULL;
}
// For performance reasons, we do not lock/unlock the global TLS map
// to check that the key is properly allocated. If the key was not
// allocated, the value read from the TLS should always be NULL
// due to pthread_key_delete() clearing the values for all threads.
return __get_tls()[key];
}
// Deletes a pthread_key_t. note that the standard mandates that this does
// not call the destructors for non-NULL key values. Instead, it is the
// responsibility of the caller to properly dispose of the corresponding data
// and resources, using any means it finds suitable.
int pthread_key_delete(pthread_key_t key) {
ScopedTlsMapAccess tls_map;
if (!IsValidUserKey(key) || !tls_map.IsInUse(key)) {
return EINVAL;
}
// Clear value in all threads.
pthread_mutex_lock(&g_thread_list_lock);
for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) {
t->tls[key] = NULL;
}
tls_map.DeleteKey(key);
pthread_mutex_unlock(&g_thread_list_lock);
return 0;
}
