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LibC: Move the __pthread_mutex_trylock function to LibC

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Let's move this to LibC because the dynamic loader depends
on this function.
This commit is contained in:
Gunnar Beutner 2021-04-24 20:34:50 +02:00 • committed by Andreas Kling
parent acd65a5f86
commit 549d9bd3ea
3 changed files with 20 additions and 12 deletions
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18
Userland/Libraries/LibC/pthread_integration.cpp
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@ -125,6 +125,24 @@ int __pthread_mutex_unlock(pthread_mutex_t* mutex)
int pthread_mutex_unlock(pthread_mutex_t*) __attribute__((weak, alias("__pthread_mutex_unlock")));
int __pthread_mutex_trylock(pthread_mutex_t* mutex)
{
auto& atomic = reinterpret_cast<Atomic<u32>&>(mutex->lock);
u32 expected = false;
if (!atomic.compare_exchange_strong(expected, true, AK::memory_order_acq_rel)) {
if (mutex->type == __PTHREAD_MUTEX_RECURSIVE && mutex->owner == pthread_self()) {
mutex->level++;
return 0;
}
return EBUSY;
}
mutex->owner = pthread_self();
mutex->level = 0;
return 0;
}
int pthread_mutex_trylock(pthread_mutex_t* mutex) __attribute__((weak, alias("__pthread_mutex_trylock")));
int __pthread_mutex_init(pthread_mutex_t* mutex, const pthread_mutexattr_t* attributes)
{
mutex->lock = 0;