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

[Josh Rivers]

I have a new thought on the crashes...I'm able to crash FreeSWITCH any time
I like, just by having an exception in a thread.
    public class CrashFreeSWITCH : ILoadNotificationPlugin
    {
        public bool Load()
        {
            ThreadPool.QueueUserWorkItem((o) => { throw new
NotImplementedException(); });
            return true;
        }
    }

Perhaps Application.ThreadException or AppDomain.UnhandledException need to
be trapped?

On Wed, Sep 9, 2009 at 4:51 PM, Michael Giagnocavo <mgg at giagnocavo.net>wrote:

>  >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> 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>wrote:
>
> >  Hi,
> >
> >
> >
> >                 Can you please elaborate on the crash you receive when
> you
> > queue a thread during load?
> >
> >
> >
> > Thanks,
> >
> > Michael
> >
> >
>
> --
> View this message in context:
> http://n2.nabble.com/Subscribing-to-events-in-managed-C-NET-tp3573619p3613195.html
> Sent from the freeswitch-users mailing list archive at Nabble.com.
>
>
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