File: x86.gcc

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/*
 * @(#)x86.gcc	11.1 (Sleepycat) 7/25/99
 *
 * For gcc/x86, 0 is clear, 1 is set.
 */
#define	MUTEX_SET(tsl) ({						\
	register tsl_t *__l = (tsl);					\
	int __r;							\
	asm volatile("movl $1,%%eax; lock; xchgb %1,%%al; xorl $1,%%eax"\
	    : "=&a" (__r), "=m" (*__l)					\
	    : "1" (*__l)						\
	    );								\
	__r & 1;							\
})

#define	MUTEX_UNSET(tsl)	(*(tsl) = 0)
#define	MUTEX_INIT(tsl)		MUTEX_UNSET(tsl)