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Annotation of sys/arch/m68k/include/lock.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: lock.h,v 1.1 2007/05/01 18:56:30 miod Exp $   */
        !             2:
        !             3: /* public domain */
        !             4:
        !             5: #ifndef        _M68K_LOCK_H_
        !             6: #define        _M68K_LOCK_H_
        !             7:
        !             8: typedef volatile u_int __cpu_simple_lock_t;
        !             9:
        !            10: #define        __SIMPLELOCK_LOCKED     1
        !            11: #define        __SIMPLELOCK_UNLOCKED   0
        !            12:
        !            13: static __inline__ void
        !            14: __cpu_simple_lock_init(__cpu_simple_lock_t *l)
        !            15: {
        !            16:        *l = __SIMPLELOCK_UNLOCKED;
        !            17: }
        !            18:
        !            19: static __inline__ void
        !            20: __cpu_simple_lock(__cpu_simple_lock_t *l)
        !            21: {
        !            22:        __cpu_simple_lock_t old;
        !            23:
        !            24:        do {
        !            25:                old = __SIMPLELOCK_LOCKED;
        !            26:                __asm__ __volatile__
        !            27:                    ("casl %0, %2, %1" : "+d" (old), "=m" (*l) : "d" (*l));
        !            28:        } while (old != __SIMPLELOCK_UNLOCKED);
        !            29: }
        !            30:
        !            31: static __inline__ int
        !            32: __cpu_simple_lock_try(__cpu_simple_lock_t *l)
        !            33: {
        !            34:        __cpu_simple_lock_t old = __SIMPLELOCK_LOCKED;
        !            35:
        !            36:        __asm__ __volatile__
        !            37:            ("casl %0, %2, %1" : "+d" (old), "=m" (*l) : "d" (*l));
        !            38:
        !            39:        return (old == __SIMPLELOCK_UNLOCKED);
        !            40: }
        !            41:
        !            42: static __inline__ void
        !            43: __cpu_simple_unlock(__cpu_simple_lock_t *l)
        !            44: {
        !            45:        *l = __SIMPLELOCK_UNLOCKED;
        !            46: }
        !            47:
        !            48: #endif /* _M68K_LOCK_H_ */