Colony

#include <stdio.h>

#include <sys/time.h>

#include <signal.h>

volatile int i;

void *tick(int sig)

{

  printf("tick. i=%d\n", i);

  fflush(stdout);

  return NULL;

}

int main()

{

  int ret;

  struct itimerval iv;

  iv.it_interval.tv_sec = 1;

  iv.it_interval.tv_usec = 0;

  iv.it_value.tv_sec = 5;

  iv.it_value.tv_usec = 0;

  signal(SIGVTALRM, tick);

  ret = setitimer(ITIMER_VIRTUAL, &iv, NULL);

  printf("setitimer returned %d.\n waiting...\n", ret);

  fflush(stdout);

  i=0;

  while(1)

    i++;

  return 0;

}