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/*
* Copyright 2019 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.
*/
#ifndef RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_
#define RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_
namespace webrtc {
class YieldInterface {
public:
virtual ~YieldInterface() = default;
virtual void YieldExecution() = 0;
};
// Sets the current thread-local yield policy while it's in scope and reverts
// to the previous policy when it leaves the scope.
class ScopedYieldPolicy final {
public:
explicit ScopedYieldPolicy(YieldInterface* policy);
ScopedYieldPolicy(const ScopedYieldPolicy&) = delete;
ScopedYieldPolicy& operator=(const ScopedYieldPolicy&) = delete;
~ScopedYieldPolicy();
// Will yield as specified by the currently active thread-local yield policy
// (which by default is a no-op).
static void YieldExecution();
private:
YieldInterface* const previous_;
};
} // namespace webrtc
// Re-export symbols from the webrtc namespace for backwards compatibility.
// TODO(bugs.webrtc.org/4222596): Remove once all references are updated.
namespace rtc {
using ::webrtc::ScopedYieldPolicy;
using ::webrtc::YieldInterface;
} // namespace rtc
#endif // RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_
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