mirror of https://gitee.com/openkylin/linux.git
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
|
|
* Generic implementation of 64-bit atomics using spinlocks,
|
|
* useful on processors that don't have 64-bit atomic instructions.
|
|
*
|
|
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_GENERIC_ATOMIC64_H
|
|
#define _ASM_GENERIC_ATOMIC64_H
|
|
#include <linux/types.h>
|
|
|
|
typedef struct {
|
|
long long counter;
|
|
} atomic64_t;
|
|
|
|
#define ATOMIC64_INIT(i) { (i) }
|
|
|
|
extern long long atomic64_read(const atomic64_t *v);
|
|
extern void atomic64_set(atomic64_t *v, long long i);
|
|
|
|
#define atomic64_set_release(v, i) atomic64_set((v), (i))
|
|
|
|
#define ATOMIC64_OP(op) \
|
|
extern void atomic64_##op(long long a, atomic64_t *v);
|
|
|
|
#define ATOMIC64_OP_RETURN(op) \
|
|
extern long long atomic64_##op##_return(long long a, atomic64_t *v);
|
|
|
|
#define ATOMIC64_FETCH_OP(op) \
|
|
extern long long atomic64_fetch_##op(long long a, atomic64_t *v);
|
|
|
|
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
|
|
|
|
ATOMIC64_OPS(add)
|
|
ATOMIC64_OPS(sub)
|
|
|
|
#undef ATOMIC64_OPS
|
|
#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
|
|
|
|
ATOMIC64_OPS(and)
|
|
ATOMIC64_OPS(or)
|
|
ATOMIC64_OPS(xor)
|
|
|
|
#undef ATOMIC64_OPS
|
|
#undef ATOMIC64_FETCH_OP
|
|
#undef ATOMIC64_OP_RETURN
|
|
#undef ATOMIC64_OP
|
|
|
|
extern long long atomic64_dec_if_positive(atomic64_t *v);
|
|
#define atomic64_dec_if_positive atomic64_dec_if_positive
|
|
extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
|
|
extern long long atomic64_xchg(atomic64_t *v, long long new);
|
|
extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u);
|
|
#define atomic64_fetch_add_unless atomic64_fetch_add_unless
|
|
|
|
#endif /* _ASM_GENERIC_ATOMIC64_H */
|