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_n(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_ 138
