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/*
* Copyright (C) 2021 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.
*/
#include "WorkerThread.h"
namespace aidl::android::hardware::biometrics::fingerprint {
// It's important that mThread is initialized after everything else because it runs a member
// function that may use any member of this class.
WorkerThread::WorkerThread(size_t maxQueueSize)
: mMaxSize(maxQueueSize),
mIsDestructing(false),
mQueue(),
mQueueMutex(),
mQueueCond(),
mThread(&WorkerThread::threadFunc, this) {}
WorkerThread::~WorkerThread() {
// This is a signal for threadFunc to terminate as soon as possible, and a hint for schedule
// that it doesn't need to do any work.
mIsDestructing = true;
mQueueCond.notify_all();
mThread.join();
}
bool WorkerThread::schedule(std::unique_ptr<Callable> task) {
if (mIsDestructing) {
return false;
}
std::unique_lock<std::mutex> lock(mQueueMutex);
if (mQueue.size() >= mMaxSize) {
return false;
}
mQueue.push_back(std::move(task));
lock.unlock();
mQueueCond.notify_one();
return true;
}
void WorkerThread::threadFunc() {
while (!mIsDestructing) {
std::unique_lock<std::mutex> lock(mQueueMutex);
mQueueCond.wait(lock, [this] { return !mQueue.empty() || mIsDestructing; });
if (mIsDestructing) {
return;
}
std::unique_ptr<Callable> task = std::move(mQueue.front());
mQueue.pop_front();
lock.unlock();
(*task)();
}
}
} // namespace aidl::android::hardware::biometrics::fingerprint
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