minor locking optimizations

[musl] / src / thread / pthread_mutex_timedlock.c

diff --git a/src/thread/pthread_mutex_timedlock.c b/src/thread/pthread_mutex_timedlock.c
index 5dfad94..f1c3eed 100644 (file)
--- a/src/thread/pthread_mutex_timedlock.c
+++ b/src/thread/pthread_mutex_timedlock.c
@@ -4,12 +4,13 @@ int pthread_mutex_timedlock(pthread_mutex_t *m, const struct timespec *at)
 {
        int r, w=0;
        while ((r=pthread_mutex_trylock(m)) == EBUSY) {
-               if (!w) a_inc(&m->__waiters), w++;
-               if (__timedwait(&m->__lock, 1, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
-                       if (w) a_dec(&m->__waiters);
+               if (!(r=m->_m_lock) || (r&0x40000000)) continue;
+               if (!w) a_inc(&m->_m_waiters), w++;
+               if (__timedwait(&m->_m_lock, r, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
+                       if (w) a_dec(&m->_m_waiters);
                        return ETIMEDOUT;
                }
        }
-       if (w) a_dec(&m->__waiters);
+       if (w) a_dec(&m->_m_waiters);
        return r;
 }