Line data    Source code

       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           0 : static inline size_t AtomicIncrement(size_t* address) {
      62           0 :   return __sync_add_and_fetch(address, 1);
      63             : }
      64             : 
      65           0 : static inline size_t AtomicDecrement(size_t* address) {
      66           0 :   return __sync_sub_and_fetch(address, 1);
      67             : }
      68             : 
      69             : #endif  // WIN32
      70             : 
      71             : #endif  // SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_