binarysem sem_produce;
binarysem sem_consume;

int g_value;

void produce(char id)
{
    int r;

    wait(sem_produce);

    r = random(100);
    cout << "Producer " << id << " made: " << r << endl;
    g_value = r;

    signal(sem_consume);
}

void consume(char id)
{
    wait(sem_consume);

    cout << "Consumer " << id << " ate: " << g_value << endl;

    signal(sem_produce);
}

main()
{
    initialsem(sem_produce, 1);
    initialsem(sem_consume, 1);

    cobegin {
        produce('A');
        produce('B');

        consume('A');
        consume('B');
        consume('C');
    }

    cout << "done." << endl;
}