Added Processor and finished ThreadPool integration

src/processor.hpp

@@ -0,0 +1,87 @@
+/**
+ * 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
+ */
+
+#ifndef RTC_PROCESSOR_H
+#define RTC_PROCESSOR_H
+
+#include "include.hpp"
+#include "threadpool.hpp"
+
+#include <condition_variable>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+
+namespace rtc {
+
+class Processor final {
+public:
+	Processor() = default;
+	~Processor();
+
+	Processor(const Processor &) = delete;
+	Processor &operator=(const Processor &) = delete;
+	Processor(Processor &&) = delete;
+	Processor &operator=(Processor &&) = delete;
+
+	void join();
+
+	template <class F, class... Args>
+	auto enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...>;
+
+protected:
+	void schedule();
+
+	std::queue<std::function<void()>> mTasks;
+	bool mPending = false;
+
+	mutable std::mutex mMutex;
+	std::condition_variable mCondition;
+};
+
+template <class F, class... Args>
+auto Processor::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
+	std::unique_lock lock(mMutex);
+	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
+	auto task = std::make_shared<std::packaged_task<R()>>(
+	    std::bind(std::forward<F>(f), std::forward<Args>(args)...));
+	std::future<R> result = task->get_future();
+
+	auto bundle = [this, task = std::move(task)]() {
+		try {
+			(*task)();
+		} catch (const std::exception &e) {
+			PLOG_WARNING << "Unhandled exception in task: " << e.what();
+		}
+		schedule();
+	};
+
+	if (!mPending) {
+		ThreadPool::Instance().enqueue(std::move(bundle));
+		mPending = true;
+	} else {
+		mTasks.emplace(std::move(bundle));
+	}
+
+	return result;
+}
+
+} // namespace rtc
+
+#endif