1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2012 Google Inc. All rights reserved. 3 // http://code.google.com/p/protobuf/ 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions are 7 // met: 8 // 9 // * Redistributions of source code must retain the above copyright 10 // notice, this list of conditions and the following disclaimer. 11 // * Redistributions in binary form must reproduce the above 12 // copyright notice, this list of conditions and the following disclaimer 13 // in the documentation and/or other materials provided with the 14 // distribution. 15 // * Neither the name of Google Inc. nor the names of its 16 // contributors may be used to endorse or promote products derived from 17 // this software without specific prior written permission. 18 // 19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 31 // This file is an internal atomic implementation, use atomicops.h instead. 32 33 #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 34 #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 35 36 // AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32, 37 // which in turn means int. On some LP32 platforms, intptr_t is an int, but 38 // on others, it's a long. When AtomicWord and Atomic32 are based on different 39 // fundamental types, their pointers are incompatible. 40 // 41 // This file defines function overloads to allow both AtomicWord and Atomic32 42 // data to be used with this interface. 43 // 44 // On LP64 platforms, AtomicWord and Atomic64 are both always long, 45 // so this problem doesn't occur. 46 47 #if !defined(GOOGLE_PROTOBUF_ARCH_64_BIT) 48 49 namespace google { 50 namespace protobuf { 51 namespace internal { 52 53 inline AtomicWord NoBarrier_CompareAndSwap(volatile AtomicWord* ptr, 54 AtomicWord old_value, 55 AtomicWord new_value) { 56 return NoBarrier_CompareAndSwap( 57 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 58 } 59 60 inline AtomicWord NoBarrier_AtomicExchange(volatile AtomicWord* ptr, 61 AtomicWord new_value) { 62 return NoBarrier_AtomicExchange( 63 reinterpret_cast<volatile Atomic32*>(ptr), new_value); 64 } 65 66 inline AtomicWord NoBarrier_AtomicIncrement(volatile AtomicWord* ptr, 67 AtomicWord increment) { 68 return NoBarrier_AtomicIncrement( 69 reinterpret_cast<volatile Atomic32*>(ptr), increment); 70 } 71 72 inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr, 73 AtomicWord increment) { 74 return Barrier_AtomicIncrement( 75 reinterpret_cast<volatile Atomic32*>(ptr), increment); 76 } 77 78 inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr, 79 AtomicWord old_value, 80 AtomicWord new_value) { 81 return Acquire_CompareAndSwap( 82 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 83 } 84 85 inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr, 86 AtomicWord old_value, 87 AtomicWord new_value) { 88 return Release_CompareAndSwap( 89 reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value); 90 } 91 92 inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) { 93 NoBarrier_Store(reinterpret_cast<volatile Atomic32*>(ptr), value); 94 } 95 96 inline void Acquire_Store(volatile AtomicWord* ptr, AtomicWord value) { 97 return Acquire_Store(reinterpret_cast<volatile Atomic32*>(ptr), value); 98 } 99 100 inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) { 101 return Release_Store(reinterpret_cast<volatile Atomic32*>(ptr), value); 102 } 103 104 inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) { 105 return NoBarrier_Load(reinterpret_cast<volatile const Atomic32*>(ptr)); 106 } 107 108 inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr) { 109 return Acquire_Load(reinterpret_cast<volatile const Atomic32*>(ptr)); 110 } 111 112 inline AtomicWord Release_Load(volatile const AtomicWord* ptr) { 113 return Release_Load(reinterpret_cast<volatile const Atomic32*>(ptr)); 114 } 115 116 } // namespace internal 117 } // namespace protobuf 118 } // namespace google 119 120 #endif // !defined(GOOGLE_PROTOBUF_ARCH_64_BIT) 121 122 #endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_ 123
