1 /* 2 * Copyright 2019 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 #ifndef RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_ 11 #define RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_ 12 13 namespace rtc { 14 class YieldInterface { 15 public: 16 virtual ~YieldInterface() = default; 17 virtual void YieldExecution() = 0; 18 }; 19 20 // Sets the current thread-local yield policy while it's in scope and reverts 21 // to the previous policy when it leaves the scope. 22 class ScopedYieldPolicy final { 23 public: 24 explicit ScopedYieldPolicy(YieldInterface* policy); 25 ScopedYieldPolicy(const ScopedYieldPolicy&) = delete; 26 ScopedYieldPolicy& operator=(const ScopedYieldPolicy&) = delete; 27 ~ScopedYieldPolicy(); 28 // Will yield as specified by the currently active thread-local yield policy 29 // (which by default is a no-op). 30 static void YieldExecution(); 31 32 private: 33 YieldInterface* const previous_; 34 }; 35 36 } // namespace rtc 37 38 #endif // RTC_BASE_SYNCHRONIZATION_YIELD_POLICY_H_ 39