Exit a method if another thread is executing it

Question

I have a method in a multi-threaded application and I\'d like the following behavior when this method is invoked:

1. If no other threads are currently executing the m

Answer 1

Here's a helper method for this purpose:

static class Throttle
{
    public static void RunExclusive(ref int isRunning, Action action)
    {
        if (isRunning > 0) return;

        bool locked = false;
        try
        {
            try { }
            finally
            {
                locked = Interlocked.CompareExchange(ref isRunning, 1, 0) == 0;
            }

            if (locked) action();
        }
        finally 
        { 
            if (locked) 
                Interlocked.Exchange(ref isRunning, 0); 
        }
    }
}

and use it like:

private int _isTuning = 0;
private void Tune() { ... }

...

Throttle.RunExclusive(ref _isTuning, Tune);