77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
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#include "utils/thread_pool.hpp"
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namespace utils {
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ThreadPool::ThreadPool(const size_t pool_size) {
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for (size_t i = 0; i < pool_size; ++i) {
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thread_pool_.emplace_back(([this] { this->ThreadLoop(); }));
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}
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}
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void ThreadPool::AddTask(std::function<void()> new_task) {
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task_queue_.WithLock([&](auto &queue) {
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queue.emplace(std::make_unique<TaskSignature>(std::move(new_task)));
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});
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queue_cv_.notify_one();
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}
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void ThreadPool::Shutdown() {
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terminate_pool_.store(true);
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queue_cv_.notify_all();
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for (auto &thread : thread_pool_) {
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if (thread.joinable()) {
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thread.join();
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}
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}
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thread_pool_.clear();
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stopped_.store(true);
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}
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ThreadPool::~ThreadPool() {
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if (!stopped_.load()) {
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Shutdown();
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}
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}
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std::unique_ptr<ThreadPool::TaskSignature> ThreadPool::PopTask() {
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return task_queue_.WithLock(
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[](auto &queue) -> std::unique_ptr<TaskSignature> {
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if (queue.empty()) {
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return nullptr;
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}
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auto front = std::move(queue.front());
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queue.pop();
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return front;
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});
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}
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void ThreadPool::ThreadLoop() {
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std::unique_ptr<TaskSignature> task = PopTask();
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while (true) {
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while (task) {
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if (terminate_pool_.load()) {
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return;
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}
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(*task)();
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task = PopTask();
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}
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std::unique_lock guard(pool_lock_);
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idle_thread_num_.fetch_add(1);
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queue_cv_.wait(guard, [&] {
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task = PopTask();
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return task || terminate_pool_.load();
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});
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idle_thread_num_.fetch_sub(1);
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if (terminate_pool_.load()) {
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return;
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}
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}
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}
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size_t ThreadPool::IdleThreadNum() const { return idle_thread_num_.load(); }
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} // namespace utils
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