switch(pid = fork())
    {
        case 0:
            printf("Producer is born!");
            //savepid("prod.pid");
            producer();
            return 0;
        case -1:
            printf("Could not fork, errno %d\n", errno);
            break;
        default:
            children[0] = pid;
            break;
    }

    switch(pid = fork())
    {
        case 0:
            printf("ReaderA is born!\n");
            //savepid("readA.pid");
            readerA();
            return 0;
        case -1:
            printf("Could not fork, errno %d\n", errno);
            break;
        default:
            children[1] = pid;
            break;
    }

    switch(pid = fork())
    {
        case 0:
            printf("ReaderB is born!\n");
            //savepid("readB.pid");
            readerB();
            return 0;
        case -1:
            printf("Could not fork, errno %d\n", errno);
            break;
        default:
            children[2] = pid;
            break;
    }

    switch(pid = fork())
    {
        case 0:
            printf("Consumer is born!\n");
            //savepid("cons.pid");
            consumer();
            return 0;
        case -1:
            printf("Could not fork, errno %d\n", errno);
            break;
        default:
            children[3] = pid;
            break;
    }