Jeffrey van Gogh | b9ece3d | 2016-04-12 11:10:44 -0700 | [diff] [blame^] | 1 | // Copyright 2013 Red Hat Inc. All rights reserved. |
| 2 | // |
| 3 | // Redistribution and use in source and binary forms, with or without |
| 4 | // modification, are permitted provided that the following conditions are |
| 5 | // met: |
| 6 | // |
| 7 | // * Redistributions of source code must retain the above copyright |
| 8 | // notice, this list of conditions and the following disclaimer. |
| 9 | // * Redistributions in binary form must reproduce the above |
| 10 | // copyright notice, this list of conditions and the following disclaimer |
| 11 | // in the documentation and/or other materials provided with the |
| 12 | // distribution. |
| 13 | // * Neither the name of Red Hat Inc. nor the names of its |
| 14 | // contributors may be used to endorse or promote products derived from |
| 15 | // this software without specific prior written permission. |
| 16 | // |
| 17 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 18 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 19 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 20 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 21 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 22 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 23 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 27 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | |
| 29 | // This file is an internal atomic implementation, use atomicops.h instead. |
| 30 | |
| 31 | #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_ |
| 32 | #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_ |
| 33 | |
| 34 | namespace google { |
| 35 | namespace protobuf { |
| 36 | namespace internal { |
| 37 | |
| 38 | inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr, |
| 39 | Atomic32 old_value, |
| 40 | Atomic32 new_value) { |
| 41 | __atomic_compare_exchange_n(ptr, &old_value, new_value, true, |
| 42 | __ATOMIC_RELAXED, __ATOMIC_RELAXED); |
| 43 | return old_value; |
| 44 | } |
| 45 | |
| 46 | inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr, |
| 47 | Atomic32 new_value) { |
| 48 | return __atomic_exchange_n(ptr, new_value, __ATOMIC_RELAXED); |
| 49 | } |
| 50 | |
| 51 | inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr, |
| 52 | Atomic32 increment) { |
| 53 | return __atomic_add_fetch(ptr, increment, __ATOMIC_RELAXED); |
| 54 | } |
| 55 | |
| 56 | inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, |
| 57 | Atomic32 increment) { |
| 58 | return __atomic_add_fetch(ptr, increment, __ATOMIC_SEQ_CST); |
| 59 | } |
| 60 | |
| 61 | inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr, |
| 62 | Atomic32 old_value, |
| 63 | Atomic32 new_value) { |
| 64 | __atomic_compare_exchange(ptr, &old_value, &new_value, true, |
| 65 | __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE); |
| 66 | return old_value; |
| 67 | } |
| 68 | |
| 69 | inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr, |
| 70 | Atomic32 old_value, |
| 71 | Atomic32 new_value) { |
| 72 | __atomic_compare_exchange_n(ptr, &old_value, new_value, true, |
| 73 | __ATOMIC_RELEASE, __ATOMIC_ACQUIRE); |
| 74 | return old_value; |
| 75 | } |
| 76 | |
| 77 | inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 78 | __atomic_store_n(ptr, value, __ATOMIC_RELAXED); |
| 79 | } |
| 80 | |
| 81 | inline void MemoryBarrier() { |
| 82 | __sync_synchronize(); |
| 83 | } |
| 84 | |
| 85 | inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 86 | __atomic_store_n(ptr, value, __ATOMIC_SEQ_CST); |
| 87 | } |
| 88 | |
| 89 | inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) { |
| 90 | __atomic_store_n(ptr, value, __ATOMIC_RELEASE); |
| 91 | } |
| 92 | |
| 93 | inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) { |
| 94 | return __atomic_load_n(ptr, __ATOMIC_RELAXED); |
| 95 | } |
| 96 | |
| 97 | inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) { |
| 98 | return __atomic_load_n(ptr, __ATOMIC_ACQUIRE); |
| 99 | } |
| 100 | |
| 101 | inline Atomic32 Release_Load(volatile const Atomic32* ptr) { |
| 102 | return __atomic_load_n(ptr, __ATOMIC_SEQ_CST); |
| 103 | } |
| 104 | |
| 105 | #ifdef __LP64__ |
| 106 | |
| 107 | inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) { |
| 108 | __atomic_store_n(ptr, value, __ATOMIC_RELEASE); |
| 109 | } |
| 110 | |
| 111 | inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) { |
| 112 | return __atomic_load_n(ptr, __ATOMIC_ACQUIRE); |
| 113 | } |
| 114 | |
| 115 | inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr, |
| 116 | Atomic64 old_value, |
| 117 | Atomic64 new_value) { |
| 118 | __atomic_compare_exchange_n(ptr, &old_value, new_value, true, |
| 119 | __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE); |
| 120 | return old_value; |
| 121 | } |
| 122 | |
| 123 | inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr, |
| 124 | Atomic64 old_value, |
| 125 | Atomic64 new_value) { |
| 126 | __atomic_compare_exchange_n(ptr, &old_value, new_value, true, |
| 127 | __ATOMIC_RELAXED, __ATOMIC_RELAXED); |
| 128 | return old_value; |
| 129 | } |
| 130 | |
| 131 | #endif // defined(__LP64__) |
| 132 | |
| 133 | } // namespace internal |
| 134 | } // namespace protobuf |
| 135 | } // namespace google |
| 136 | |
| 137 | #endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_GENERIC_GCC_H_ |