Only raise an event if the previous one was completed

Question

I\'m using a System.Timers.Timer in my application. Every second I run a function which does some job. The thing is, this function can block for some little tim

Answer 1

You can follow the following pattern to skip doing the indicated work if another invocation of this method is still running:

private int isWorking = 0;
public void Foo()
{
    if (Interlocked.Exchange(ref isWorking, 1) == 0)
    {
        try
        {
            //Do work
        }
        finally
        {
            Interlocked.Exchange(ref isWorking, 0);
        }
    }
}

The approach that you were using with a Mutex will result in addition ticks waiting for earlier ticks to finish, not skipping invocations when another is still running, which is what you said you wanted. (When dealing with timers like this its common to want to skip such ticks, not wait. If your tick handlers regularly take too long you end up with a giant queue of waiting handlers.)