/*
 * interleaving-with-wait.c
 */

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/wait.h>

#define NUM_CHILDREN 3
#define NUM_ITERATIONS 10
#define SLEEP_NSECS 50

void do_kid_stuff(int);

int
main(int argc, char *argv[])
{
    int i;
    pid_t reaped_pid;

    for(i=0; i<NUM_CHILDREN; i++) {
        if(fork() == 0) {
            do_kid_stuff(i);
            exit(0);
        }
    }

    for(i=0; i<NUM_CHILDREN; i++) {
        reaped_pid = wait(NULL);
        printf("reaped %d\n", reaped_pid);
    }
}

void
do_kid_stuff(int id)
{
    int i;
    struct timespec ts;

    ts.tv_sec = 0;
    ts.tv_nsec = SLEEP_NSECS;

    for(i=0; i<NUM_ITERATIONS; i++) {
        printf("%d\n", id);
        nanosleep(&ts, NULL);
    }
}