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LibC: Use memory_order_acquire instead of memory_order_acq_rel

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Acquire ordering should be sufficient for pthread_mutex_lock
and pthread_mutex_trylock.
This commit is contained in:
Gunnar Beutner 2021-06-02 09:09:01 +02:00 • committed by Andreas Kling
parent 90f4c9e44c
commit 9e3fb73169
1 changed files with 2 additions and 2 deletions
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4
Userland/Libraries/LibC/pthread_integration.cpp
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@ -96,7 +96,7 @@ int __pthread_mutex_lock(pthread_mutex_t* mutex)
pthread_t this_thread = __pthread_self(); pthread_t this_thread = __pthread_self();
for (;;) { for (;;) {
u32 expected = 0; u32 expected = 0;
if (!AK::atomic_compare_exchange_strong(&mutex->lock, expected, 1u, AK::memory_order_acq_rel)) { if (!AK::atomic_compare_exchange_strong(&mutex->lock, expected, 1u, AK::memory_order_acquire)) {
if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->owner == this_thread) { if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->owner == this_thread) {
mutex->level++; mutex->level++;
return 0; return 0;
@ -128,7 +128,7 @@ int pthread_mutex_unlock(pthread_mutex_t*) __attribute__((weak, alias("__pthread
int __pthread_mutex_trylock(pthread_mutex_t* mutex) int __pthread_mutex_trylock(pthread_mutex_t* mutex)
{ {
u32 expected = 0; u32 expected = 0;
if (!AK::atomic_compare_exchange_strong(&mutex->lock, expected, 1u, AK::memory_order_acq_rel)) { if (!AK::atomic_compare_exchange_strong(&mutex->lock, expected, 1u, AK::memory_order_acquire)) {
if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->owner == pthread_self()) { if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->owner == pthread_self()) {
mutex->level++; mutex->level++;
return 0; return 0;