| /* 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; |
| |
| /* 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 |
