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Producter-Consumer Problem

semaphore mutex = 1;
semaphore fillCount = 0;
semaphore emptyCount = BUFFER_SIZE;

procedure producer() {
    while (true) {
        item = produceItem();
        down(emptyCount);
            down(mutex);
                putItemIntoBuffer(item);
            up(mutex);
        up(fillCount);
    }
}
procedure consumer() {
    while (true) {
        down(fillCount);
            down(mutex);
                item = removeItemFromBuffer();
            up(mutex);
        up(emptyCount);
        consumeItem(item);
    }
}