add missing files to git

CppTimer.h

@@ -0,0 +1,85 @@
+#ifndef __CPP_TIMER_H_
+#define __CPP_TIMER_H_
+
+/**
+ * GNU GENERAL PUBLIC LICENSE
+ * Version 3, 29 June 2007
+ *
+ * (C) 2020, Bernd Porr <mail@bernporr.me.uk>
+ * 
+ * This is inspired by the timer_create man page.
+ **/
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include <time.h>
+#include <functional>
+#include <atomic>
+
+#define CLOCKID CLOCK_MONOTONIC
+#define SIG SIGRTMIN
+
+/**
+ * Timer class which repeatedly fires. It's wrapper around the
+ * POSIX per-process timer.
+ **/
+class CppTimer {
+
+public:
+	static constexpr int PERIODIC = 0;
+	static constexpr int ONESHOT  = 1;
+	static constexpr long MS_TO_NS  = 1000000;
+	/**
+	 * Creates an instance of the timer and connects the
+	 * signal handler to the timer.
+	 **/
+	CppTimer();
+
+	/**
+	 * Starts the timer. The timer fires first after
+	 * the specified time in nanoseconds and then at
+	 * that interval in PERIODIC mode. In ONESHOT mode
+	 * the timer fires once after the specified time in
+	 * nanoseconds.
+	 **/
+	virtual void start(long nanosecs, std::function<void()> callbackIn, int type = PERIODIC); 
+
+	/**
+	* Stops the timer by disarming it. It can be re-started
+	* with start().
+	**/
+	virtual void stop();
+
+	/**
+	 * Destructor disarms the timer, deletes it and
+	 * disconnect the signal handler.
+	 **/
+	virtual ~CppTimer();
+	
+	bool isRunning();
+	
+	void block();
+
+private:
+	timer_t timerid = 0;
+	struct sigevent sev;
+	struct sigaction sa;
+	struct itimerspec its;
+	int pipeFd[2];
+	std::atomic<bool> running = false;
+	std::function<void()> callback;
+	void discardPipe();
+		
+	static void handler(int sig, siginfo_t *si, void *uc ) {
+		CppTimer *timer = reinterpret_cast<CppTimer *> (si->si_value.sival_ptr);
+		timer->callback();
+		char buf = '\n'; 
+		write(timer->pipeFd[1], &buf, 1);
+		timer->running = false;
+	}
+};
+
+
+#endif