#ifndef TIMER_HPP
#define TIMER_HPP

#include <signal.h> // sigset_t
#include <time.h> // timer_t

class Timer
{

public:

  Timer(const int signal = SIGALRM );
  virtual ~Timer() {}

  virtual void timerExpired()  {}

  virtual void periodicTimerExpired() {}


  void createTimer(const time_t interval_sec,
                   const long interval_nsec = 0,
                   const time_t initExpr_sec = 0,
                   const long initExpr_nsec = 0);

  void wait();

  void stopTimer();

  void gracefulStop();

private:

  // after turning on all warnings, gcc reports that the class has pointer
  // data members (time_t, which is an int by the way) so copy ctor and
  // assign op shall be inmplemented
  Timer(const Timer& timer);
  Timer& operator=(const Timer&) { return *this; }

  int m_signal;
  struct sigaction m_sigAction;
  timer_t m_timerId;
  bool m_periodic;
  bool m_running;

}; // class Timer


#endif // TIMER_HPP