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

You can do this using Monitor.TryEnter, but perhaps more simply: Interlocked:

int executing; // make this static if you want this one-caller-only to
               // all objects instead of a single object
void Foo() {
    bool won = false;
    try {
        won = Interlocked.CompareExchange(ref executing, 1, 0) == 0;
        if(won) {
           // your code here
        }
    } finally {
        if(won) Interlocked.Exchange(ref executing, 0);
    }

}