mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-31 22:10:34 +03:00
1ea339b697
This sets __HAVE_64B_ATOMICS if provided. It also sets USE_ATOMIC_COMPILER_BUILTINS to true if the existing atomic ops use the __atomic* builtins (aarch64, mips partially) or if this has been tested (x86_64); otherwise, this is set to false so that C11 atomics will be based on the existing atomic operations.
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _BITS_ATOMIC_H
|
|
#define _BITS_ATOMIC_H 1
|
|
|
|
#include <stdint.h>
|
|
|
|
/* Coldfire has no atomic compare-and-exchange operation, and the
|
|
kernel provides no userspace atomicity operations. Here we just
|
|
use generic non-atomic implementations instead. */
|
|
|
|
typedef int8_t atomic8_t;
|
|
typedef uint8_t uatomic8_t;
|
|
typedef int_fast8_t atomic_fast8_t;
|
|
typedef uint_fast8_t uatomic_fast8_t;
|
|
|
|
typedef int16_t atomic16_t;
|
|
typedef uint16_t uatomic16_t;
|
|
typedef int_fast16_t atomic_fast16_t;
|
|
typedef uint_fast16_t uatomic_fast16_t;
|
|
|
|
typedef int32_t atomic32_t;
|
|
typedef uint32_t uatomic32_t;
|
|
typedef int_fast32_t atomic_fast32_t;
|
|
typedef uint_fast32_t uatomic_fast32_t;
|
|
|
|
typedef int64_t atomic64_t;
|
|
typedef uint64_t uatomic64_t;
|
|
typedef int_fast64_t atomic_fast64_t;
|
|
typedef uint_fast64_t uatomic_fast64_t;
|
|
|
|
typedef intptr_t atomicptr_t;
|
|
typedef uintptr_t uatomicptr_t;
|
|
typedef intmax_t atomic_max_t;
|
|
typedef uintmax_t uatomic_max_t;
|
|
|
|
/* If we have just non-atomic operations, we can as well make them wide. */
|
|
#define __HAVE_64B_ATOMICS 1
|
|
#define USE_ATOMIC_COMPILER_BUILTINS 0
|
|
|
|
/* The only basic operation needed is compare and exchange. */
|
|
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
|
|
({ __typeof (mem) __gmemp = (mem); \
|
|
__typeof (*mem) __gret = *__gmemp; \
|
|
__typeof (*mem) __gnewval = (newval); \
|
|
\
|
|
if (__gret == (oldval)) \
|
|
*__gmemp = __gnewval; \
|
|
__gret; })
|
|
|
|
#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
|
|
({ __typeof (mem) __gmemp = (mem); \
|
|
__typeof (*mem) __gnewval = (newval); \
|
|
\
|
|
*__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; })
|
|
|
|
#endif
|