#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

void *print_message_function( void *ptr )
{
    pthread_t num = pthread_self();
    while(1)
    {
        printf("Thread %d doing a system() call\n", num);
        system("echo HANG! > /dev/null");
        printf("Thread %d call finished\n", num);
    }
}

int main(int argc, char *argv[])
{
    pthread_t thread1;
    pthread_t thread2;

    pthread_create( &thread1, NULL, print_message_function, NULL);
    pthread_create( &thread2, NULL, print_message_function, NULL);

    while(1)
    {
    }
}