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/**
* Copyright (c) 2020 Paul-Louis Ageneau
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "threadpool.hpp"
namespace rtc {
ThreadPool &ThreadPool::Instance() {
// Init handles joining on cleanup
static ThreadPool *instance = new ThreadPool;
return *instance;
}
ThreadPool::~ThreadPool() { join(); }
int ThreadPool::count() const {
std::unique_lock lock(mWorkersMutex);
return int(mWorkers.size());
}
void ThreadPool::spawn(int count) {
std::unique_lock lock(mWorkersMutex);
mJoining = false;
while (count-- > 0)
mWorkers.emplace_back(std::bind(&ThreadPool::run, this));
}
void ThreadPool::join() {
std::unique_lock lock(mWorkersMutex);
mJoining = true;
mCondition.notify_all();
for (auto &w : mWorkers)
w.join();
mWorkers.clear();
}
void ThreadPool::run() {
while (runOne()) {
}
}
bool ThreadPool::runOne() {
if (auto task = dequeue()) {
task();
return true;
}
return false;
}
std::function<void()> ThreadPool::dequeue() {
std::unique_lock lock(mMutex);
mCondition.wait(lock, [this]() { return !mTasks.empty() || mJoining; });
if (mTasks.empty())
return nullptr;
auto task = std::move(mTasks.front());
mTasks.pop();
return task;
}
} // namespace rtc