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optimize spin lock not to dirty cache line while spinning

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This commit is contained in:
Rich Felker
2015-04-22 03:16:50 -04:00
parent b8dda24fe1
commit 7b1fb0c526
1 changed files with 1 additions and 1 deletions
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2
src/thread/pthread_spin_lock.c
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@ -2,6 +2,6 @@
int pthread_spin_lock(pthread_spinlock_t *s) 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; return 0;
} }