atomic.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- /* $Id: atomic.h,v 1.22 2001/07/11 23:56:07 davem Exp $
- * atomic.h: Thankfully the V9 is at least reasonable for this
- * stuff.
- *
- * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
- */
- #ifndef __ARCH_SPARC64_ATOMIC__
- #define __ARCH_SPARC64_ATOMIC__
- typedef struct { volatile int counter; } atomic_t;
- #define ATOMIC_INIT(i) { (i) }
- #define atomic_read(v) ((v)->counter)
- #define atomic_set(v, i) (((v)->counter) = i)
- extern int __atomic_add(int, atomic_t *);
- extern int __atomic_sub(int, atomic_t *);
- #define atomic_add(i, v) ((void)__atomic_add(i, v))
- #define atomic_sub(i, v) ((void)__atomic_sub(i, v))
- #define atomic_dec_return(v) __atomic_sub(1, v)
- #define atomic_inc_return(v) __atomic_add(1, v)
- #define atomic_sub_and_test(i, v) (__atomic_sub(i, v) == 0)
- #define atomic_dec_and_test(v) (__atomic_sub(1, v) == 0)
- #define atomic_inc(v) ((void)__atomic_add(1, v))
- #define atomic_dec(v) ((void)__atomic_sub(1, v))
- /* Atomic operations are already serializing */
- #define smp_mb__before_atomic_dec() barrier()
- #define smp_mb__after_atomic_dec() barrier()
- #define smp_mb__before_atomic_inc() barrier()
- #define smp_mb__after_atomic_inc() barrier()
- #endif /* !(__ARCH_SPARC64_ATOMIC__) */