From b8b85a42729dc96e43d51848823fbe28ad92b5c0 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Thu, 24 Mar 2011 23:06:08 -0400 Subject: optimize contended case for pthread_spin_trylock --- src/thread/pthread_spin_trylock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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; } -- cgit v1.2.1