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

[Josh Rivers]

The question is whether the CLR should take down the whole phone server due
to an unhandled exception...definitely the CLR should terminate...but
shouldn't it just log the exception to the console, not crash the core?

On Wed, Sep 9, 2009 at 6:30 PM, Michael Giagnocavo <mgg at giagnocavo.net>wrote:

>  That’s by design. If a thread fails, and there’s no handler, then the
> application could be in a corrupted state, so the CLR takes down the
> process.
>
>
>
> I think there is a .NET 1.0 compat switch you can enable in the config if
> you like exceptions to be silently ignored J.
>
>
>
> -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 6:39 PM
>
> *To:* freeswitch-users at lists.freeswitch.org
> *Subject:* Re: [Freeswitch-users] Subscribing to events in managed C# /
> .NET
>
>
>
> 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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