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/arch/sh/include/asm/atomic.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 74 lines | 47 code | 13 blank | 14 comment | 9 complexity | 99d07ebea7a9b713d9b96b7440653089 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 1#ifndef __ASM_SH_ATOMIC_H
 2#define __ASM_SH_ATOMIC_H
 3
 4/*
 5 * Atomic operations that C can't guarantee us.  Useful for
 6 * resource counting etc..
 7 *
 8 */
 9
10#include <linux/compiler.h>
11#include <linux/types.h>
12#include <asm/system.h>
13
14#define ATOMIC_INIT(i)	( (atomic_t) { (i) } )
15
16#define atomic_read(v)		(*(volatile int *)&(v)->counter)
17#define atomic_set(v,i)		((v)->counter = (i))
18
19#if defined(CONFIG_GUSA_RB)
20#include <asm/atomic-grb.h>
21#elif defined(CONFIG_CPU_SH4A)
22#include <asm/atomic-llsc.h>
23#else
24#include <asm/atomic-irq.h>
25#endif
26
27#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
28#define atomic_dec_return(v)		atomic_sub_return(1, (v))
29#define atomic_inc_return(v)		atomic_add_return(1, (v))
30#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)
31#define atomic_sub_and_test(i,v)	(atomic_sub_return((i), (v)) == 0)
32#define atomic_dec_and_test(v)		(atomic_sub_return(1, (v)) == 0)
33#define atomic_inc_not_zero(v)		atomic_add_unless((v), 1, 0)
34
35#define atomic_inc(v)			atomic_add(1, (v))
36#define atomic_dec(v)			atomic_sub(1, (v))
37
38#define atomic_xchg(v, new)		(xchg(&((v)->counter), new))
39#define atomic_cmpxchg(v, o, n)		(cmpxchg(&((v)->counter), (o), (n)))
40
41/**
42 * atomic_add_unless - add unless the number is a given value
43 * @v: pointer of type atomic_t
44 * @a: the amount to add to v...
45 * @u: ...unless v is equal to u.
46 *
47 * Atomically adds @a to @v, so long as it was not @u.
48 * Returns non-zero if @v was not @u, and zero otherwise.
49 */
50static inline int atomic_add_unless(atomic_t *v, int a, int u)
51{
52	int c, old;
53	c = atomic_read(v);
54	for (;;) {
55		if (unlikely(c == (u)))
56			break;
57		old = atomic_cmpxchg((v), c, c + (a));
58		if (likely(old == c))
59			break;
60		c = old;
61	}
62
63	return c != (u);
64}
65
66#define smp_mb__before_atomic_dec()	smp_mb()
67#define smp_mb__after_atomic_dec()	smp_mb()
68#define smp_mb__before_atomic_inc()	smp_mb()
69#define smp_mb__after_atomic_inc()	smp_mb()
70
71#include <asm-generic/atomic-long.h>
72#include <asm-generic/atomic64.h>
73
74#endif /* __ASM_SH_ATOMIC_H */