File: ia64.gcc

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/*
 * $Id: ia64.gcc,v 1.2 2002/02/02 18:18:05 ghutchis Exp $
 *
 * For gcc/ia64, 0 is clear, 1 is set.
 */
#define	MUTEX_SET(tsl) ({						\
	register tsl_t *__l = (tsl);					\
	long __r;							\
	asm volatile("xchg1 %0=%1,%3" : "=r"(__r), "=m"(*__l) : "1"(*__l), "r"(1));\
	__r ^ 1;							\
})

/*
 * Store through a "volatile" pointer so we get a store with "release"
 * semantics.
 */
#define	MUTEX_UNSET(tsl)	(*(volatile unsigned char *)(tsl) = 0)
#define	MUTEX_INIT(tsl)		MUTEX_UNSET(tsl)