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160c02089e
Chromoting is planning to bump up the iOS deployment target to 10.0 before but is blocked by WebRTC because it uses deprecated OSAtomic* APIs. This CL replaces the platform specific Atomic32 implementation and uses C++11's std::atomic instead. Bug: webrtc:8413 Change-Id: Icbd29bb92eec60066589bbabf53e0d50df2f9b0d Reviewed-on: https://webrtc-review.googlesource.com/12740 Commit-Queue: Yuwei Huang <yuweih@google.com> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20376}
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*
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* Copyright (c) 2012 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 independent 32-bit integer. Unless you know what you're
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// doing, use locks instead! :-)
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//
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// Note: assumes 32-bit (or higher) system
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#ifndef SYSTEM_WRAPPERS_INCLUDE_ATOMIC32_H_
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#define SYSTEM_WRAPPERS_INCLUDE_ATOMIC32_H_
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#include <atomic>
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#include <stddef.h>
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#include "common_types.h" // NOLINT(build/include)
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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// DEPRECATED: Please use std::atomic<int32_t> instead.
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// TODO(yuweih): Replace Atomic32 uses with std::atomic<int32_t> and remove this
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// class. (bugs.webrtc.org/8428)
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// 32 bit atomic variable. Note that this class relies on the compiler to
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// align the 32 bit value correctly (on a 32 bit boundary), so as long as you're
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// not doing things like reinterpret_cast over some custom allocated memory
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// without being careful with alignment, you should be fine.
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class Atomic32 {
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public:
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Atomic32(int32_t initial_value = 0);
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~Atomic32();
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// Prefix operator!
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int32_t operator++();
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int32_t operator--();
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int32_t operator+=(int32_t value);
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int32_t operator-=(int32_t value);
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// Sets the value atomically to new_value if the value equals compare value.
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// The function returns true if the exchange happened.
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bool CompareExchange(int32_t new_value, int32_t compare_value);
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int32_t Value() const;
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private:
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RTC_DISALLOW_COPY_AND_ASSIGN(Atomic32);
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std::atomic<int32_t> value_;
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};
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} // namespace webrtc
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#endif // SYSTEM_WRAPPERS_INCLUDE_ATOMIC32_H_
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