You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.3 KiB
67 lines
2.3 KiB
/* |
|
* 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 |
|
|
|
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); |
|
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 int atomic64_add_unless(atomic64_t *v, long long a, long long u); |
|
|
|
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
|
#define atomic64_inc(v) atomic64_add(1LL, (v)) |
|
#define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) |
|
#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
|
#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) |
|
#define atomic64_dec(v) atomic64_sub(1LL, (v)) |
|
#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) |
|
#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) |
|
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) |
|
|
|
#endif /* _ASM_GENERIC_ATOMIC64_H */
|
|
|