Cross-Threading

[netbird]

Im a bit confused with sending information between threads.

I have a thread thats constantly checking a UDP port for incoming packets. When a packet arrive i need it to send the packet to one of several different classes thats run by other threads that decodes the information.

Im experiencing an issue where the program stops recieving packets while its decoding which lead me to believe that the UDP-thread also do the decoding.

Right now im using an event to send the packet:

public event PacketToProcessDelegate OnPacketToProcess;

and i use it:

if (recvBytes != 0)
{
// Decode incoming packet
OnPacketToProcess(dataBuffer);
}


So my question is: On what thread is the event handled?

Thanks!

[Arjay]

It depends on how things are set up.

Try displaying a trace message for the thread id to see if the event handler matches your current thread id. Use the System.Thread.CurrentThread.ManagedThreadId property.

[Mutant_Fruit]

If it's a standard event with standard event handlers, then yes, it's the same thread.

public event EventHandler MyEvent;

public void Method ()
{
    // This event handler will be executed on the same thread as invocation in 'Whatever'
    MyEvent += delegate { Console.WriteLine ("I'm on the same thread"); };
}

public void Whatever ()
{
    // Raise 'MyEvent' on the same thread
    MyEvent (this, EventArgs.Empty);

    // Raise 'MyEvent' on a different thread
    Threadpool.QueueUserWorkDelegate (delegate {
        MyEvent (this, EventArgs.Empty);
    });
}