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/* $OpenBSD: _atomic_lock.c,v 1.3 2009/06/01 23:17:52 miod Exp $ */
/*
* Atomic lock for mips
* Written by Miodrag Vallat <miod@openbsd.org> - placed in the public domain.
*/
#include "spinlock.h"
int
_atomic_lock(volatile _spinlock_lock_t *lock)
{
_spinlock_lock_t old;
__asm__ __volatile__ (
"1: ll %0, 0(%1)\n"
" sc %2, 0(%1)\n"
" beqz %2, 1b\n"
" nop\n" :
"=r"(old) :
"r"(lock), "r"(_SPINLOCK_LOCKED) : "memory");
return (old != _SPINLOCK_UNLOCKED);
}
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