/*
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* Copyright (C) 2015-2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_WORKER_H_
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#define ANDROID_WORKER_H_
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#include <stdint.h>
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#include <stdlib.h>
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#include <string>
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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namespace android {
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class Worker {
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public:
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void Lock() {
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mutex_.lock();
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}
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void Unlock() {
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mutex_.unlock();
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}
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void Signal() {
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cond_.notify_all();
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}
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void Exit();
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bool initialized() const {
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return initialized_;
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}
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protected:
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Worker(const char *name, int priority);
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virtual ~Worker();
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int InitWorker();
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virtual void Routine() = 0;
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/*
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* Must be called with the lock acquired. max_nanoseconds may be negative to
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* indicate infinite timeout, otherwise it indicates the maximum time span to
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* wait for a signal before returning.
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* Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out
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*/
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int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1);
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bool should_exit() const {
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return exit_;
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}
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std::mutex mutex_;
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std::condition_variable cond_;
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private:
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void InternalRoutine();
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std::string name_;
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int priority_;
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std::unique_ptr<std::thread> thread_;
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bool exit_;
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bool initialized_;
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};
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} // namespace android
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#endif
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