1 /* 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/system_wrappers/include/atomic32.h" 12 13 #include <assert.h> 14 #include <inttypes.h> 15 #include <malloc.h> 16 17 #include "webrtc/common_types.h" 18 19 namespace webrtc { 20 21 Atomic32::Atomic32(int32_t initial_value) 22 : value_(initial_value) { 23 assert(Is32bitAligned()); 24 } 25 26 Atomic32::~Atomic32() { 27 } 28 29 int32_t Atomic32::operator++() { 30 return __sync_fetch_and_add(&value_, 1) + 1; 31 } 32 33 int32_t Atomic32::operator--() { 34 return __sync_fetch_and_sub(&value_, 1) - 1; 35 } 36 37 int32_t Atomic32::operator+=(int32_t value) { 38 int32_t return_value = __sync_fetch_and_add(&value_, value); 39 return_value += value; 40 return return_value; 41 } 42 43 int32_t Atomic32::operator-=(int32_t value) { 44 int32_t return_value = __sync_fetch_and_sub(&value_, value); 45 return_value -= value; 46 return return_value; 47 } 48 49 bool Atomic32::CompareExchange(int32_t new_value, int32_t compare_value) { 50 return __sync_bool_compare_and_swap(&value_, compare_value, new_value); 51 } 52 53 } // namespace webrtc 54
