Device: Add com keepalive

include/icsneo/api/periodic.h

@@ -0,0 +1,53 @@
+#ifndef __PERIODIC_H__
+#define __PERIODIC_H__
+
+#ifdef __cplusplus
+
+#include <condition_variable>
+#include <mutex>
+#include <functional>
+#include <chrono>
+#include <thread>
+
+namespace icsneo {
+
+class Periodic {
+public:
+	using Callback = std::function<bool(void)>;
+	Periodic(Callback&& callback, const std::chrono::milliseconds& period) :
+		thread(&Periodic::loop, this, std::move(callback), period)
+	{}
+	~Periodic() {
+		{
+			std::scoped_lock lk(mutex);
+			stop = true;
+		}
+		cv.notify_all();
+		thread.join();
+	}
+private:
+	void loop(Callback&& callback, const std::chrono::milliseconds& period) {
+		while (true) {
+			{
+				std::unique_lock lk(mutex);
+				cv.wait_for(lk, period, [&]{ return stop; });
+				if(stop) {
+					break;
+				}
+			}
+			if (!callback()) {
+				break;
+			}
+		}
+	}
+	bool stop = false;
+	std::condition_variable cv;
+	std::mutex mutex;
+	std::thread thread;
+};
+
+} // icsneo
+
+#endif // __cplusplus
+
+#endif // __PERIODIC_H__