/* Count the number of busy loops we can do in 0.1sec. */

#include <signal.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

int interrupt = 0;

void handler(int signal) {
  interrupt = 1;
}

int main(void) {
  if (fork() != 0) {
    signal(SIGALRM, handler);
    while(1) {
      long long counter = 0;
      interrupt = 0;
      while (!interrupt) counter++;
      printf("%9llu ", counter);
      fflush(stdout);
    }
  } else {
    int pid = getppid();
    while (1) {
      usleep(100000); /* Wake up parent at 10Hz */
      kill(pid, SIGALRM);
    }
  }
}