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&#39;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">&lt;<a href="mailto:mgg@giagnocavo.net">mgg@giagnocavo.net</a>&gt;</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&#39;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) =&gt; { 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 &lt;<a href="mailto:mgg@giagnocavo.net" target="_blank">mgg@giagnocavo.net</a>&gt; wrote:</p>

<div>

<div>

<div>

<p>&gt;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) =&gt;</p>

</div>

<div>

<p>            {</p>

</div>

<div>

<p>              
 Log.WriteLine(LogLevel.Notice, &quot;Thread Starting. &quot;);</p>

</div>

<div>

<p>                EventConsumer
con = new EventConsumer(&quot;all&quot;, &quot;&quot;);</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, &quot;Event: &quot; + 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 &#39;startup-script&#39; 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 &lt;<a href="mailto:jlenk@frontiernet.net" target="_blank">jlenk@frontiernet.net</a>&gt;
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>
&quot;startup-script&quot; 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>
&lt;<a href="mailto:mgg@giagnocavo.net" target="_blank">mgg@giagnocavo.net</a>&gt;wrote:<br>
<br>
&gt;  Hi,<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt;                 Can you please
elaborate on the crash you receive when you<br>
&gt; queue a thread during load?<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; Thanks,<br>
&gt;<br>
&gt; Michael<br>
&gt;<br>
&gt;</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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