stdcpp_waiter.h (1600B)
1 // Copyright 2023 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 16 #ifndef ABSL_SYNCHRONIZATION_INTERNAL_STDCPP_WAITER_H_ 17 #define ABSL_SYNCHRONIZATION_INTERNAL_STDCPP_WAITER_H_ 18 19 #include <condition_variable> // NOLINT(build/c++11) 20 #include <mutex> // NOLINT(build/c++11) 21 22 #include "absl/base/config.h" 23 #include "absl/synchronization/internal/kernel_timeout.h" 24 #include "absl/synchronization/internal/waiter_base.h" 25 26 namespace absl { 27 ABSL_NAMESPACE_BEGIN 28 namespace synchronization_internal { 29 30 #define ABSL_INTERNAL_HAVE_STDCPP_WAITER 1 31 32 class StdcppWaiter : public WaiterCrtp<StdcppWaiter> { 33 public: 34 StdcppWaiter(); 35 36 bool Wait(KernelTimeout t); 37 void Post(); 38 void Poke(); 39 40 static constexpr char kName[] = "StdcppWaiter"; 41 42 private: 43 // REQUIRES: mu_ must be held. 44 void InternalCondVarPoke(); 45 46 std::mutex mu_; 47 std::condition_variable cv_; 48 int waiter_count_; 49 int wakeup_count_; // Unclaimed wakeups. 50 }; 51 52 } // namespace synchronization_internal 53 ABSL_NAMESPACE_END 54 } // namespace absl 55 56 #endif // ABSL_SYNCHRONIZATION_INTERNAL_STDCPP_WAITER_H_