// Copyright 2023 The Abseil Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // #ifndef ABSL_SYNCHRONIZATION_INTERNAL_WAITER_BASE_H_ #define ABSL_SYNCHRONIZATION_INTERNAL_WAITER_BASE_H_ #include "absl/base/config.h" #include "absl/base/internal/thread_identity.h" #include "absl/synchronization/internal/kernel_timeout.h" namespace absl { ABSL_NAMESPACE_BEGIN namespace synchronization_internal { // `Waiter` is a platform specific semaphore implementation that `PerThreadSem` // waits on to implement blocking in `absl::Mutex`. Implementations should // inherit from `WaiterCrtp` and must implement `Wait()`, `Post()`, and `Poke()` // as described in `WaiterBase`. `waiter.h` selects the implementation and uses // static-dispatch for performance. class WaiterBase { … }; template <typename T> class WaiterCrtp : public WaiterBase { … }; } // namespace synchronization_internal ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_SYNCHRONIZATION_INTERNAL_WAITER_BASE_H_