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?<br>
<br><div class="gmail_quote">On Wed, Sep 9, 2009 at 6:30 PM, Michael Giagnocavo <span dir="ltr"><<a href="mailto:mgg@giagnocavo.net">mgg@giagnocavo.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p><span style="font-size:11.0pt;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.</span></p>
<p><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p><span style="font-size:11.0pt;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;color:#1F497D">.</span></p>
<p><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p><span style="font-size:11.0pt;color:#1F497D">-Michael</span></p>
<p><span style="font-size:11.0pt;color:#1F497D"> </span></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 6:39 PM</span></p><div><div></div><div class="h5"><br>
<b>To:</b> <a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a><br>
<b>Subject:</b> Re: [Freeswitch-users] Subscribing to events in managed C# /
.NET</div></div><p></p>
</div><div><div></div><div class="h5">
<p> </p>
<p>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.</p>
<div>
<p> </p>
<div>
<p> public class CrashFreeSWITCH :
ILoadNotificationPlugin</p>
</div>
<div>
<p> {</p>
</div>
<div>
<p> public bool Load()</p>
</div>
<div>
<p> {</p>
</div>
<div>
<p>
ThreadPool.QueueUserWorkItem((o) => { throw new
NotImplementedException(); });</p>
</div>
<div>
<p> return true;</p>
</div>
<div>
<p> }</p>
</div>
<div>
<p> }</p>
</div>
<div>
<p> </p>
</div>
<div>
<p>Perhaps <span><span>Application.ThreadException
or AppDomain.UnhandledException need to be trapped?</span></span></p>
</div>
<div>
<p> </p>
</div>
<div>
<p>On Wed, Sep 9, 2009 at 4:51 PM, Michael Giagnocavo <<a href="mailto:mgg@giagnocavo.net" target="_blank">mgg@giagnocavo.net</a>> wrote:</p>
<div>
<div>
<div>
<p>>Looks like the event object goes straight to pinvokes, so a null result
just crashes?</p>
<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.</p>
<p> </p>
<p>-Michael </p>
<p><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p><span style="font-size:11.0pt;color:#1F497D"> </span></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></p>
<div>
<p><br>
<b>To:</b> <a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a></p>
</div>
<p><b>Subject:</b> Re: [Freeswitch-users] Subscribing to events
in managed C# / .NET</p>
</div>
<div>
<div>
<p> </p>
<p>A new discovery:</p>
<div>
<div>
<p> public bool Load()</p>
</div>
<div>
<p> {</p>
</div>
<div>
<p>
ThreadPool.QueueUserWorkItem((o) =></p>
</div>
<div>
<p> {</p>
</div>
<div>
<p>
Log.WriteLine(LogLevel.Notice, "Thread Starting. ");</p>
</div>
<div>
<p> EventConsumer
con = new EventConsumer("all", "");</p>
</div>
<div>
<p> while (true)</p>
</div>
<div>
<p> {</p>
</div>
<div>
<p>
Event ev = con.pop(0);</p>
</div>
<div>
<p>
if (ev == null) continue;</p>
</div>
<div>
<p>
Log.WriteLine(LogLevel.Notice, "Event: " + ev.serialized_string);</p>
</div>
<div>
<p> }</p>
</div>
<div>
<p> });</p>
</div>
<div>
<p> return true;</p>
</div>
<div>
<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?</p>
</div>
<div>
<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.</p>
</div>
<div>
<p> </p>
</div>
<div>
<p>--Josh</p>
</div>
<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:</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.</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>
></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></p>
<div>
<div>
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