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79 lines
2.1 KiB
79 lines
2.1 KiB
4 months ago
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/*
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* Copyright (C) 2017 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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#include <broadcastradio-utils/WorkerThread.h>
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namespace android {
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using std::chrono::milliseconds;
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using std::chrono::steady_clock;
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using std::function;
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using std::lock_guard;
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using std::mutex;
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using std::priority_queue;
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using std::this_thread::sleep_for;
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using std::unique_lock;
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bool operator<(const WorkerThread::Task& lhs, const WorkerThread::Task& rhs) {
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return lhs.when > rhs.when;
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}
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WorkerThread::WorkerThread() : mIsTerminating(false), mThread(&WorkerThread::threadLoop, this) {}
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WorkerThread::~WorkerThread() {
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{
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lock_guard<mutex> lk(mMut);
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mIsTerminating = true;
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mCond.notify_one();
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}
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mThread.join();
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}
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void WorkerThread::schedule(function<void()> task, milliseconds delay) {
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auto when = steady_clock::now() + delay;
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lock_guard<mutex> lk(mMut);
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mTasks.push(Task({when, task}));
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mCond.notify_one();
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}
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void WorkerThread::cancelAll() {
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lock_guard<mutex> lk(mMut);
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priority_queue<Task>().swap(mTasks); // empty queue
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}
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void WorkerThread::threadLoop() {
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while (!mIsTerminating) {
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unique_lock<mutex> lk(mMut);
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if (mTasks.empty()) {
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mCond.wait(lk);
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continue;
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}
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auto task = mTasks.top();
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if (task.when > steady_clock::now()) {
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mCond.wait_until(lk, task.when);
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continue;
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}
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mTasks.pop();
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lk.unlock(); // what() might need to schedule another task
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task.what();
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}
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}
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} // namespace android
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