[Freeswitch-users] Subscribing to events in managed C# / .NET

[Michael Giagnocavo]

>Looks like the event object goes straight to pinvokes, so a null result just crashes?

If it's null, you should get a NullReferenceException. The C# compiler should callvirt the property getter and that'll do a null check. If that isn't happening, that'd be an interesting optimization somewhere along the line.

-Michael


From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Josh Rivers
Sent: Wednesday, September 09, 2009 3:01 PM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] Subscribing to events in managed C# / .NET

A new discovery:
        public bool Load()
        {
            ThreadPool.QueueUserWorkItem((o) =>
            {
                Log.WriteLine(LogLevel.Notice, "Thread Starting. ");
                EventConsumer con = new EventConsumer("all", "");
                while (true)
                {
                    Event ev = con.pop(0);
                    if (ev == null) continue;
                    Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);
                }
            });
            return true;
        }
Does not crash. (Adding the null check prevents crash.) The backgrounded loop runs fine. Looks like the event object goes straight to pinvokes, so a null result just crashes?

I like the idea of a 'startup-script' for mod_managed. It would also be excellent if there was an event or message  informing the background code to terminate nicely when the module reloads.

--Josh

On Wed, Sep 9, 2009 at 12:57 PM, Jeff Lenk <jlenk at frontiernet.net<mailto:jlenk at frontiernet.net>> wrote:

I think the problem here is that the loader only keeps this method in scope
until completion then it drops the remoted connection. Therefore you should
not use threads in this method. Michael please correct me if I am wrong
here.

As an example of the failure simply just put a Sleep(10000) call in the
thread and you will see the failure.

As Michael said this method was only designed to allow the option to opt out
of being loaded.

In order to support this perhaps a configuration flag simular to the lua
"startup-script" should be added.



Here is the error I get with the loop I mentioned. -Josh
[image: Capture.PNG]

On Tue, Sep 8, 2009 at 5:05 AM, Michael Giagnocavo
<mgg at giagnocavo.net<mailto:mgg at giagnocavo.net>>wrote:

>  Hi,
>
>
>
>                 Can you please elaborate on the crash you receive when you
> queue a thread during load?
>
>
>
> Thanks,
>
> Michael
>
>
--
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