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| author | Rich Felker <dalias@aerifal.cx> | 2011-03-16 16:49:42 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-03-16 16:49:42 -0400 |
| commit | 1d59f1eddbcca03063cf080ded6df13170adcb23 (patch) | |
| tree | 6fa97ba4a311717774e10ffc5b466f436f69a746 | |
| parent | d4f9e0b3642a81d07c95302cd9aa0dcaf7de1a05 (diff) | |
| download | musl-1d59f1eddbcca03063cf080ded6df13170adcb23.tar.gz | |
simplify logic, slightly optimize contended case for non-default mutex types
| -rw-r--r-- | src/thread/pthread_mutex_trylock.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/src/thread/pthread_mutex_trylock.c b/src/thread/pthread_mutex_trylock.c index 25b9e869..af421472 100644 --- a/src/thread/pthread_mutex_trylock.c +++ b/src/thread/pthread_mutex_trylock.c @@ -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; |