about summary refs log tree commit diff
path: root/src
diff options
context:
space:
mode:
authorRich Felker <dalias@aerifal.cx>2015-04-22 03:16:50 -0400
committerRich Felker <dalias@aerifal.cx>2015-04-22 03:16:50 -0400
commit7b1fb0c526936873a260e860ce3bca82113c3d4c (patch)
tree62adafeeb4ebde15e03c2efa6a675641bcf8209e /src
parentb8dda24fe1caa901a99580f7a52defb95aedb67c (diff)
downloadmusl-7b1fb0c526936873a260e860ce3bca82113c3d4c.tar.gz
musl-7b1fb0c526936873a260e860ce3bca82113c3d4c.tar.xz
musl-7b1fb0c526936873a260e860ce3bca82113c3d4c.zip
optimize spin lock not to dirty cache line while spinning
Diffstat (limited to 'src')
-rw-r--r--src/thread/pthread_spin_lock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_spin_lock.c b/src/thread/pthread_spin_lock.c
index df575f08..0462e0f3 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;
 }