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authorRich Felker <dalias@aerifal.cx>2011-03-17 12:14:40 -0400
committerRich Felker <dalias@aerifal.cx>2011-03-17 12:14:40 -0400
commite914f8b7ec79f622fa3b017af434642f61d45ce8 (patch)
treedfba95ae52b2a5998269f7296bef97aa9fce47c4 /src/thread
parent1d59f1eddbcca03063cf080ded6df13170adcb23 (diff)
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optimize contended normal mutex case; add int compare-and-swap atomic
Diffstat (limited to 'src/thread')
-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;