/* * Copyright 2019 The Android Open Source Project * * 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 * * http://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. */ #pragma once #include #include #include #include "common/callback.h" #include "os/handler.h" #include "os/thread.h" #include "os/utils.h" namespace bluetooth { namespace os { // A single-shot alarm for reactor-based thread, implemented by Linux timerfd. // When it's constructed, it will register a reactable on the specified thread; when it's destroyed, it will unregister // itself from the thread. class Alarm { public: // Create and register a single-shot alarm on a given handler explicit Alarm(Handler* handler); // Unregister this alarm from the thread and release resource ~Alarm(); DISALLOW_COPY_AND_ASSIGN(Alarm); // Schedule the alarm with given delay void Schedule(common::OnceClosure task, std::chrono::milliseconds delay); // Cancel the alarm. No-op if it's not armed. void Cancel(); private: common::OnceClosure task_; Handler* handler_; int fd_ = 0; Reactor::Reactable* token_; mutable std::mutex mutex_; void on_fire(); }; } // namespace os } // namespace bluetooth