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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think there is a .NET 1.0 compat switch you can enable in the
config if you like exceptions to be silently ignored </span><span
style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-Michael<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
freeswitch-users-bounces@lists.freeswitch.org
[mailto:freeswitch-users-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Josh
Rivers<br>
<b>Sent:</b> Wednesday, September 09, 2009 6:39 PM<br>
<b>To:</b> freeswitch-users@lists.freeswitch.org<br>
<b>Subject:</b> Re: [Freeswitch-users] Subscribing to events in managed C# /
.NET<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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.<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal> public class CrashFreeSWITCH :
ILoadNotificationPlugin<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> {<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> public bool Load()<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> {<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>
ThreadPool.QueueUserWorkItem((o) => { throw new
NotImplementedException(); });<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> return true;<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> }<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> }<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Perhaps <span class=apple-style-span><span
style='font-family:"Arial","sans-serif"'>Application.ThreadException
or AppDomain.UnhandledException need to be trapped?</span></span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>On Wed, Sep 9, 2009 at 4:51 PM, Michael Giagnocavo <<a
href="mailto:mgg@giagnocavo.net">mgg@giagnocavo.net</a>> wrote:<o:p></o:p></p>
<div>
<div>
<div>
<p>>Looks like the event object goes straight to pinvokes, so a null result
just crashes?<o:p></o:p></p>
<p> <o:p></o:p></p>
</div>
<p>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.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>-Michael <o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:
10.0pt'> <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org"
target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a> [mailto:<a
href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>]
<b>On Behalf Of </b>Josh Rivers<br>
<b>Sent:</b> Wednesday, September 09, 2009 3:01 PM</span><o:p></o:p></p>
<div>
<p class=MsoNormal><br>
<b>To:</b> <a href="mailto:freeswitch-users@lists.freeswitch.org"
target="_blank">freeswitch-users@lists.freeswitch.org</a><o:p></o:p></p>
</div>
<p class=MsoNormal><b>Subject:</b> Re: [Freeswitch-users] Subscribing to events
in managed C# / .NET<o:p></o:p></p>
</div>
<div>
<div>
<p> <o:p></o:p></p>
<p>A new discovery:<o:p></o:p></p>
<div>
<div>
<p> public bool Load()<o:p></o:p></p>
</div>
<div>
<p> {<o:p></o:p></p>
</div>
<div>
<p>
ThreadPool.QueueUserWorkItem((o) =><o:p></o:p></p>
</div>
<div>
<p> {<o:p></o:p></p>
</div>
<div>
<p>
Log.WriteLine(LogLevel.Notice, "Thread Starting. ");<o:p></o:p></p>
</div>
<div>
<p> EventConsumer
con = new EventConsumer("all", "");<o:p></o:p></p>
</div>
<div>
<p> while (true)<o:p></o:p></p>
</div>
<div>
<p> {<o:p></o:p></p>
</div>
<div>
<p>
Event ev = con.pop(0);<o:p></o:p></p>
</div>
<div>
<p>
if (ev == null) continue;<o:p></o:p></p>
</div>
<div>
<p>
Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);<o:p></o:p></p>
</div>
<div>
<p> }<o:p></o:p></p>
</div>
<div>
<p> });<o:p></o:p></p>
</div>
<div>
<p> return true;<o:p></o:p></p>
</div>
<div>
<p> }<o:p></o:p></p>
</div>
<div>
<p>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?<o:p></o:p></p>
</div>
<div>
<p> <o:p></o:p></p>
</div>
<div>
<p>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.<o:p></o:p></p>
</div>
<div>
<p> <o:p></o:p></p>
</div>
<div>
<p>--Josh<o:p></o:p></p>
</div>
<p> <o:p></o:p></p>
<div>
<p>On Wed, Sep 9, 2009 at 12:57 PM, Jeff Lenk <<a
href="mailto:jlenk@frontiernet.net" target="_blank">jlenk@frontiernet.net</a>>
wrote:<o:p></o:p></p>
<p><br>
I think the problem here is that the loader only keeps this method in scope<br>
until completion then it drops the remoted connection. Therefore you should<br>
not use threads in this method. Michael please correct me if I am wrong<br>
here.<br>
<br>
As an example of the failure simply just put a Sleep(10000) call in the<br>
thread and you will see the failure.<br>
<br>
As Michael said this method was only designed to allow the option to opt out<br>
of being loaded.<br>
<br>
In order to support this perhaps a configuration flag simular to the lua<br>
"startup-script" should be added.<o:p></o:p></p>
<div>
<p style='margin-bottom:12.0pt'><br>
<br>
<br>
Here is the error I get with the loop I mentioned. -Josh<br>
[image: Capture.PNG]<br>
<br>
On Tue, Sep 8, 2009 at 5:05 AM, Michael Giagnocavo<br>
<<a href="mailto:mgg@giagnocavo.net" target="_blank">mgg@giagnocavo.net</a>>wrote:<br>
<br>
> Hi,<br>
><br>
><br>
><br>
> Can you please
elaborate on the crash you receive when you<br>
> queue a thread during load?<br>
><br>
><br>
><br>
> Thanks,<br>
><br>
> Michael<br>
><br>
><o:p></o:p></p>
</div>
<p><span style='color:#888888'>--<br>
View this message in context: <a
href="http://n2.nabble.com/Subscribing-to-events-in-managed-C-NET-tp3573619p3613195.html"
target="_blank">http://n2.nabble.com/Subscribing-to-events-in-managed-C-NET-tp3573619p3613195.html</a><br>
Sent from the freeswitch-users mailing list archive at Nabble.com.</span><o:p></o:p></p>
<div>
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<p> <o:p></o:p></p>
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