From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 25 Mar 2011 03:06:08 +0000 (-0400)
Subject: optimize contended case for pthread_spin_trylock
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;ds=sidebyside;h=b8b85a42729dc96e43d51848823fbe28ad92b5c0;p=musl

optimize contended case for pthread_spin_trylock
---

diff --git a/src/thread/pthread_spin_trylock.c b/src/thread/pthread_spin_trylock.c
index c12696b3..1fc5f73c 100644
--- a/src/thread/pthread_spin_trylock.c
+++ b/src/thread/pthread_spin_trylock.c
@@ -2,5 +2,6 @@
 
 int pthread_spin_trylock(pthread_spinlock_t *s)
 {
-	return -a_xchg(s, 1) & EBUSY;
+	if (*s || a_xchg(s, 1)) return EBUSY;
+	return 0;
 }