Timer Create Sample

#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <time.h>

#define rdtsc(low,high) __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))

timer_t tt;

void handler (int sig, siginfo_t * extra, void *cruft)
{
  static last_i=0;
  unsigned int i, j;
  rdtsc(i,j);
  printf ("time:%u, %u, [%u] %uHZ \n", j, i, i-last_i, (i-last_i)*10/1000000);
  last_i = i;
}

int main ()
{
  int i=0;
  sigset_t sigset;

  sigfillset (&sigset);
  sigdelset (&sigset, SIGRTMIN);
  sigprocmask (SIG_SETMASK, &sigset, NULL);

  struct sigaction sa;
  sigfillset (&sa.sa_mask);
  sa.sa_flags = SA_SIGINFO;
  sa.sa_sigaction = handler;

  if (sigaction (SIGRTMIN, &sa, NULL) < 0)
  {
    perror ("sigaction failed ");
    exit (-1);
  }

  struct sigevent timer_event;
  struct itimerspec timer;

  timer.it_interval.tv_sec = 0;
  timer.it_interval.tv_nsec = 100 * 1000 * 1000;
  timer.it_value = timer.it_interval;

  timer_event.sigev_notify = SIGEV_SIGNAL;
  timer_event.sigev_signo = SIGRTMIN;
  timer_event.sigev_value.sival_ptr = (void *) &tt;

  if (timer_create (CLOCK_REALTIME, &timer_event, &tt) < 0)
  {
    perror ("timer_create failed");
    exit (-1);
  }

  if (timer_settime (tt, 0, &timer, NULL) < 0)
  {
    perror ("timer_settime failed");
    exit (-1);
  }

  while (i++ < 10)
  {
    pause ();
  }

  return 0;
}