| commit | 02084109f0f0d6e0a7fe4a8cb3a90a422725e264 | [log] [tgz] |
|---|---|---|
| author | Rich Felker <dalias@aerifal.cx> | Wed Mar 30 09:06:00 2011 -0400 |
| committer | Rich Felker <dalias@aerifal.cx> | Wed Mar 30 09:06:00 2011 -0400 |
| tree | d0c40b22c52dc87c62de4848f77d1bf48bf343fb | |
| parent | 124b4ebc8a293e616cc0a7eaba3587c9b7ff13ec [diff] |
streamline mutex unlock to remove a useless branch, use a_store to unlock this roughly halves the cost of pthread_mutex_unlock, at least for non-robust, normal-type mutexes. the a_store change is in preparation for future support of archs which require a memory barrier or special atomic store operation, and also should prevent the possibility of the compiler misordering writes.