1 /* 2 * Copyright 2011 Google Inc. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_ 18 #define SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_ 19 20 #if defined (WIN32) 21 22 #include <windows.h> 23 24 static inline size_t AtomicIncrement(size_t* address) { 25 #if defined (_WIN64) 26 return InterlockedIncrement64(reinterpret_cast<LONGLONG*>(address)); 27 #else 28 return InterlockedIncrement(reinterpret_cast<LONG*>(address)); 29 #endif 30 } 31 32 static inline size_t AtomicDecrement(size_t* address) { 33 #if defined (_WIN64) 34 return InterlockedDecrement64(reinterpret_cast<LONGLONG*>(address)); 35 #else 36 return InterlockedDecrement(reinterpret_cast<LONG*>(address)); 37 #endif 38 } 39 40 #elif defined (__APPLE__) 41 42 #include <libkern/OSAtomic.h> 43 44 static inline size_t AtomicIncrement(size_t* address) { 45 return OSAtomicIncrement32Barrier(reinterpret_cast<int32_t*>(address)); 46 } 47 48 static inline size_t AtomicDecrement(size_t* address) { 49 return OSAtomicDecrement32Barrier(reinterpret_cast<int32_t*>(address)); 50 } 51 52 // Originally we check __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4, however, there are 53 // issues that clang not carring over this definition. Therefore we boldly 54 // assume it's gcc or gcc-compatible here. Compilation shall still fail since 55 // the intrinsics used are GCC-specific. 56 57 #else 58 59 #include <stddef.h> 60 61 static inline size_t AtomicIncrement(size_t* address) { 62 return __sync_add_and_fetch(address, 1); 63 } 64 65 static inline size_t AtomicDecrement(size_t* address) { 66 return __sync_sub_and_fetch(address, 1); 67 } 68 69 #endif // WIN32 70 71 #endif // SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_ 72
