Initial commit

src/graphics/asyncJob.h

@@ -0,0 +1,96 @@
+#ifndef EMULATOR_INCLUDE_EMULATOR_GRAPHICS_ASYNCJOB_H_
+#define EMULATOR_INCLUDE_EMULATOR_GRAPHICS_ASYNCJOB_H_
+
+#include "common/common.h"
+#include "common/profiler.h"
+#include "common/threads.h"
+
+#include <functional>
+#include <string>
+#include <utility>
+
+namespace Libs::Graphics {
+
+class AsyncJob final {
+public:
+	using Task = std::function<void()>;
+
+	explicit AsyncJob(std::string thread_name = {})
+	    : m_thread_name(std::move(thread_name)), m_worker_thread(WorkerEntry, this) {}
+
+	~AsyncJob() {
+		{
+			Common::LockGuard lock(m_mutex);
+			m_stop_requested = true;
+			m_task_available_condition.Signal();
+		}
+
+		m_worker_thread.Join();
+	}
+
+	KYTY_CLASS_NO_COPY(AsyncJob);
+
+	void Execute(Task task) {
+		Common::LockGuard lock(m_mutex);
+		while (m_is_busy) {
+			m_idle_condition.Wait(&m_mutex);
+		}
+
+		m_task    = std::move(task);
+		m_is_busy = true;
+		m_task_available_condition.Signal();
+	}
+
+	void Wait() {
+		Common::LockGuard lock(m_mutex);
+		while (m_is_busy) {
+			m_idle_condition.Wait(&m_mutex);
+		}
+	}
+
+private:
+	static void WorkerEntry(void* data) { static_cast<AsyncJob*>(data)->WorkerLoop(); }
+
+	void WorkerLoop() {
+		if (!m_thread_name.empty()) {
+			KYTY_PROFILER_THREAD(m_thread_name.c_str());
+		}
+
+		for (;;) {
+			Task task;
+			{
+				Common::LockGuard lock(m_mutex);
+				while (!m_is_busy && !m_stop_requested) {
+					m_task_available_condition.Wait(&m_mutex);
+				}
+
+				if (!m_is_busy) {
+					return;
+				}
+
+				task = std::move(m_task);
+			}
+
+			task();
+
+			{
+				Common::LockGuard lock(m_mutex);
+				m_is_busy = false;
+				m_idle_condition.SignalAll();
+			}
+		}
+	}
+
+	std::string     m_thread_name;
+	Common::Mutex   m_mutex;
+	Common::CondVar m_task_available_condition;
+	Common::CondVar m_idle_condition;
+	Task            m_task;
+	bool            m_is_busy        = false;
+	bool            m_stop_requested = false;
+	Common::Thread  m_worker_thread;
+};
+
+} // namespace Libs::Graphics
+
+#endif /* EMULATOR_INCLUDE_EMULATOR_GRAPHICS_ASYNCJOB_H_ */