| commit | 7b1fb0c526936873a260e860ce3bca82113c3d4c | [log] [tgz] |
|---|---|---|
| author | Rich Felker <dalias@aerifal.cx> | Wed Apr 22 03:16:50 2015 -0400 |
| committer | Rich Felker <dalias@aerifal.cx> | Wed Apr 22 03:16:50 2015 -0400 |
| tree | 62adafeeb4ebde15e03c2efa6a675641bcf8209e | |
| parent | b8dda24fe1caa901a99580f7a52defb95aedb67c [diff] |
optimize spin lock not to dirty cache line while spinning
diff --git a/src/thread/pthread_spin_lock.c b/src/thread/pthread_spin_lock.c index df575f0..0462e0f 100644 --- a/src/thread/pthread_spin_lock.c +++ b/src/thread/pthread_spin_lock.c
@@ -2,6 +2,6 @@ int pthread_spin_lock(pthread_spinlock_t *s) { - while (a_swap(s, 1)) a_spin(); + while (*(volatile int *)s || a_cas(s, 0, 1)) a_spin(); return 0; }