56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Atomic system independant 32-bit integer.
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// Note: uses full memory barriers.
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// Note: assumes 32-bit (or higher) system
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#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_
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#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_
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#include "common_types.h"
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namespace webrtc {
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class Atomic32Impl;
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class Atomic32Wrapper
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{
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public:
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Atomic32Wrapper(WebRtc_Word32 initialValue = 0);
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~Atomic32Wrapper();
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// Prefix operator!
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WebRtc_Word32 operator++();
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WebRtc_Word32 operator--();
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Atomic32Wrapper& operator=(const Atomic32Wrapper& rhs);
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Atomic32Wrapper& operator=(WebRtc_Word32 rhs);
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WebRtc_Word32 operator+=(WebRtc_Word32 rhs);
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WebRtc_Word32 operator-=(WebRtc_Word32 rhs);
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// Sets the value atomically to newValue if the value equals compare value.
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// The function returns true if the exchange happened.
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bool CompareExchange(WebRtc_Word32 newValue, WebRtc_Word32 compareValue);
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WebRtc_Word32 Value() const;
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private:
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// Disable the + and - operator since it's unclear what these operations
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// should do.
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Atomic32Wrapper operator+(const Atomic32Wrapper& rhs);
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Atomic32Wrapper operator-(const Atomic32Wrapper& rhs);
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WebRtc_Word32& operator++(int);
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WebRtc_Word32& operator--(int);
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// Cheshire cat to hide the implementation (faster than
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// using virtual functions)
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Atomic32Impl& _impl;
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};
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} // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ATOMIC32_WRAPPER_H_
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