mirror of
https://github.com/Evolution-X/hardware_interfaces
synced 2026-02-01 11:36:00 +00:00
b12109202a
Currently mThread is started in initializer list, but not in constructor, when the thread starts in initializer list, not all class members are init yet (depends on the order of class member declarations). And mThread will use class members. Putting mThread to starts in constructor ensures all class member variables are init before thread starts. Bug: 231737939 Test: build Change-Id: I4033efa9f13c2ece95c4b4f99f8c88b6d4816be1
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/*
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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) {
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// putting mThread in constructor instead of initializer list
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// to ensure all class members are init before mThread starts
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mThread = std::thread(&WorkerThread::threadLoop, this);
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}
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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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