common/mutex: Return true, if unlocked.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This commit is contained in:
iabdalkader 2025-09-14 21:49:34 +02:00
parent 6a1c9b8ab9
commit 9beb565882
2 changed files with 7 additions and 3 deletions

View File

@ -31,7 +31,9 @@ void mutex_init0(mutex_t *m) {
}
void mutex_lock(mutex_t *m, size_t tid) {
while (atomic_flag_test_and_set_explicit(&m->lock, memory_order_acquire));
while (atomic_flag_test_and_set_explicit(&m->lock, memory_order_acquire)) {
}
atomic_store_explicit(&m->tid, tid, memory_order_release);
}
@ -53,8 +55,10 @@ bool mutex_try_lock_fair(mutex_t *m, size_t tid) {
return false;
}
void mutex_unlock(mutex_t *m, size_t tid) {
bool mutex_unlock(mutex_t *m, size_t tid) {
if (atomic_load_explicit(&m->tid, memory_order_acquire) == tid) {
atomic_flag_clear_explicit(&m->lock, memory_order_release);
return true;
}
return false;
}

View File

@ -48,5 +48,5 @@ void mutex_lock(mutex_t *mutex, size_t tid);
bool mutex_try_lock(mutex_t *mutex, size_t tid);
// Prevents a thread from locking twice in a row.
bool mutex_try_lock_fair(mutex_t *mutex, size_t tid);
void mutex_unlock(mutex_t *mutex, size_t tid);
bool mutex_unlock(mutex_t *mutex, size_t tid);
#endif // __MUTEX_H__