How to implement my own locking mechanism

Question

For assignment (this is for concurrency if you're interested) - I need to implement my own lock

(more specifically: a TaS, a TTas and Array-Lock, as described in the "Multiprocessor Programming Program")

There are several test I / O circuits on the Internet that I have tried (it is too bad that they have been trying for a long time to try).

Your program is designed to count 9-digit numbers that pass a specific test

(It was called elfproef in Dutch, I do not know English equivalence, sorry).

Sometimes I got a slightly different number, which suggests that my lock does not work 100% to the right.

I implemented locks as follows:

interface Lock
{
    void Lock();
    void Unlock();
}

class TaSLock : Lock
{
    AtomicBool state = new AtomicBool(false);

    void Lock.Lock()
    { while (state.getAndSet(true)); }

    void Lock.Unlock()
    { state.getAndSet(false); }
}

AtomicBool integer, Interlocked Boolean. , ( ) .

class AtomicBool
{
    int value;
    static int True = 1, False = -1;

    public AtomicBool(bool value)
    {
        if (value) this.value = True;
        else this.value = False;
    }

    public void set(bool newValue)
    {
        if (newValue) Interlocked.Exchange(ref value, True);
        else Interlocked.Exchange(ref value, False);
    }

    public bool getAndSet(bool newValue)
    {
        int oldValue;
        if (newValue) oldValue = Interlocked.Exchange(ref value, True);
        else oldValue = Interlocked.Exchange(ref value, False);
        return (oldValue == True);
    }

    public bool get()
    {
        return (Interlocked.Add(ref value, 0) == 1);
    }
}

, :

theLock.Lock();
counter++;
theLock.Unlock();

.

- , ?

Answer 1

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