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-rw-r--r--src/thread/pthread_mutex_trylock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c
index af421472..6fc604fe 100644
--- a/src/thread/pthread_mutex_trylock.c
+++ b/src/thread/pthread_mutex_trylock.c
@@ -5,7 +5,7 @@ int pthread_mutex_trylock(pthread_mutex_t *m)
 	int tid;
 
 	if (m->_m_type == PTHREAD_MUTEX_NORMAL)
-		return -a_xchg(&m->_m_lock, 1) & EBUSY;
+		return (m->_m_lock || a_swap(&m->_m_lock, 1)) ? EBUSY : 0;
 
 	tid = pthread_self()->tid;