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optimize contended case for pthread_spin_trylock

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This commit is contained in:
Rich Felker
2011-03-24 23:06:08 -04:00
parent c322fe4e1a
commit b8b85a4272
1 changed files with 2 additions and 1 deletions
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3
src/thread/pthread_spin_trylock.c
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@ -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;
}