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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/system_wrappers/interface/atomic32.h"
#include <assert.h>
#include <windows.h>
#include "webrtc/common_types.h"
#include "webrtc/system_wrappers/interface/compile_assert.h"
namespace webrtc {
Atomic32::Atomic32(int32_t initial_value)
: value_(initial_value) {
COMPILE_ASSERT(sizeof(value_) == sizeof(LONG),
counter_variable_is_the_expected_size);
assert(Is32bitAligned());
}
Atomic32::~Atomic32() {
}
int32_t Atomic32::operator++() {
return static_cast<int32_t>(InterlockedIncrement(
reinterpret_cast<volatile LONG*>(&value_)));
}
int32_t Atomic32::operator--() {
return static_cast<int32_t>(InterlockedDecrement(
reinterpret_cast<volatile LONG*>(&value_)));
}
int32_t Atomic32::operator+=(int32_t value) {
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
value);
}
int32_t Atomic32::operator-=(int32_t value) {
return InterlockedExchangeAdd(reinterpret_cast<volatile LONG*>(&value_),
-value);
}
bool Atomic32::CompareExchange(int32_t new_value, int32_t compare_value) {
const LONG old_value = InterlockedCompareExchange(
reinterpret_cast<volatile LONG*>(&value_),
new_value,
compare_value);
// If the old value and the compare value is the same an exchange happened.
return (old_value == compare_value);
}
} // namespace webrtc
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