optimize contended case for pthread_spin_trylock

b8b85a42 · Rich Felker · c322fe4e · b8b85a42
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src/thread/pthread_spin_trylock.c src/thread/pthread_spin_trylock.c +2 -1

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--- 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;
 }