| /* |
| * 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); |
| extern void atomic64_add(long long a, atomic64_t *v); |
| extern long long atomic64_add_return(long long a, atomic64_t *v); |
| extern void atomic64_sub(long long a, atomic64_t *v); |
| extern long long atomic64_sub_return(long long a, atomic64_t *v); |
| 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 */ |