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optimize contended normal mutex case; add int compare-and-swap atomic

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Rich Felker 2011-03-17 12:14:40 -04:00
commit e914f8b7ec
3 changed files with 15 additions and 1 deletions
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2
src/thread/pthread_mutex_trylock.c
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@ -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;