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89 lines
2.2 KiB
89 lines
2.2 KiB
/* |
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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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#define LOG_TAG "WorkerThread" |
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//#define LOG_NDEBUG 0 |
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#include <broadcastradio-utils/WorkerThread.h> |
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#include <log/log.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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ALOGV("%s", __func__); |
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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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ALOGV("%s", __func__); |
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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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ALOGV("%s", __func__); |
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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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ALOGV("%s", __func__); |
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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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