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Message-Id: <1429051493-2821-1-git-send-email-amonakov@ispras.ru> Date: Wed, 15 Apr 2015 01:44:53 +0300 From: Alexander Monakov <amonakov@...ras.ru> To: musl@...ts.openwall.com Cc: Alexander Monakov <amonakov@...ras.ru> Subject: [PATCH] Use CAS instead of atomic swap to implement spinlock This should allow spinning without constantly dirtying cache lines holding the spinlock value. On architectures without native atomic swap, musl implement a_swap by looping around a_cas. --- If I'm not mistaken this was also suggested by nsz on IRC. src/thread/pthread_spin_lock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/thread/pthread_spin_lock.c b/src/thread/pthread_spin_lock.c index df575f0..dabcb31 100644 --- a/src/thread/pthread_spin_lock.c +++ b/src/thread/pthread_spin_lock.c @@ -2,6 +2,6 @@ int pthread_spin_lock(pthread_spinlock_t *s) { - while (a_swap(s, 1)) a_spin(); + while (a_cas(s, 0, 1)) a_spin(); return 0; } -- 2.1.3
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