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simplify logic, slightly optimize contended case for non-default mutex types

This commit is contained in:
Rich Felker 2011-03-16 16:49:42 -04:00
parent d4f9e0b364
commit 1d59f1eddb
1 changed files with 2 additions and 4 deletions
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6
src/thread/pthread_mutex_trylock.c
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@ -9,15 +9,13 @@ int pthread_mutex_trylock(pthread_mutex_t *m)
tid = pthread_self()->tid;
if (m->_m_owner == tid) {
if (m->_m_type != PTHREAD_MUTEX_RECURSIVE)
return EBUSY;
if (m->_m_owner == tid && m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
m->_m_count++;
return 0;
}
if (a_xchg(&m->_m_lock, 1)) return EBUSY;
if (m->_m_owner || a_xchg(&m->_m_lock, 1)) return EBUSY;
m->_m_owner = tid;
m->_m_count = 1;
return 0;