add mysql & http funcs

src/utils/thread_pool.hpp

@@ -0,0 +1,60 @@
+#pragma once
+
+namespace utils
+{
+	class thread_pool
+	{
+	public:
+		using job = std::function<void()>;
+		using job_ptr = std::unique_ptr<job>;
+
+		friend class worker;
+		class worker
+		{
+		public:
+			worker();
+
+			friend class thread_pool;
+
+			void start(thread_pool& pool);
+			void stop();
+			void loop(thread_pool& pool);
+
+		private:
+			std::thread thread_;
+
+		};
+
+		thread_pool() = default;
+		thread_pool(const std::size_t num_workers);
+		void initialize(const std::size_t num_workers);
+
+		void start();
+		void update();
+		void stop();
+
+		template <typename F>
+		void push(F&& job)
+		{
+			if (this->stopped_)
+			{
+				return;
+			}
+
+			std::lock_guard lock(this->mutex_);
+			this->queue_.emplace_back(std::make_unique<thread_pool::job>(std::forward<F>(job)));
+			this->event_.notify_one();
+		}
+
+	private:
+		thread_pool::job_ptr pop_job();
+		void run_job();
+
+		std::mutex mutex_;
+		std::atomic_bool stopped_;
+		std::deque<job_ptr> queue_;
+		std::condition_variable event_;
+		std::deque<std::unique_ptr<worker>> workers_;
+
+	};
+}