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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I guess you meant ast_autoservice_stop not ast_service_stop.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Honestly I have no idea what causes your problem – it is
something for Russell to look at probably.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>However, I’m almost sure that upgrading tor latest SVN 1.4
branch will fix the problem because of commit 90967.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> asterisk-dev-bounces@lists.digium.com
[mailto:asterisk-dev-bounces@lists.digium.com] <b>On Behalf Of </b>Paulo Garcia<br>
<b>Sent:</b> Tuesday, December 11, 2007 10:44 PM<br>
<b>To:</b> Asterisk Developers Mailing List<br>
<b>Subject:</b> [asterisk-dev] Asterisk 1.4.15 ast_service_stop() function
deadlock?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi,<br>
<br>
well, it isn't really a deadlock, but I think it is something wrong....<br>
<br>
in my channel driver, I have a fax detection procedure that calls
ast_exists_extensions() to check if there is a 'fax' exten available to jump
for. <br>
<br>
My test environment is an Asterisk box with FXO interface and another
non-asterisk box with FXS interface. The FXS side originates the call and the
asterisk box answer the call.<br>
<br>
I always used the following dialplan for testing: <br>
<br>
exten => s,1,Answer(1000);<br>
exten => s,n,Record(test:ulaw|0|0)<br>
exten => s,n,NoOp(${REMOTESTATIONID})<br>
<br>
When the Asterisk side answer the call, the FXS side starts a Fax transmit. Of
course the fax won't be received since there is no Rx application running on
Asterisk side. <br>
<br>
The problem is that, when the Asterisk detects the fax signal and calls
ast_exists_extensions(), the function ast_service_stop() only returns when the
call finishes. I followed the stack and it seems that the ast_service_stop
function stay the following point: <o:p></o:p></p>
<pre>00234 <span class=comment>/* Wait for it to un-block */</span><o:p></o:p></pre><pre><a
name=l00235></a>00235 <span class=keywordflow>while</span> (<a
href="http://www.asterisk.org/doxygen/1.4/utils_8h.html#0cba63300a5690b7f297b26179882cd9">ast_test_flag</a>(<a
href="http://www.asterisk.org/doxygen/1.4/structasent.html#24fea160601399d6d7a15f28b22bebd7"><o:p></o:p></a></pre><pre><span
class=MsoHyperlink><a
href="http://www.asterisk.org/doxygen/1.4/structasent.html#24fea160601399d6d7a15f28b22bebd7">chan</a></span>, <a
href="http://www.asterisk.org/doxygen/1.4/channel_8h.html#d032a9ab2ed31c90af611a3c6221925306284ba3d5b82164197739aff2f52568">AST_FLAG_BLOCKING</a>))<br>
<a name=l00236></a>00236 usleep(1000);<o:p></o:p></pre>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
So, If my call takes 3 minutes, the Asterisk will stay on that point for 3
minutes and return only to hangup.<br>
<br>
Also, I tested using Asterisk 1.4.14 and this problem doesn't happen. I saw
that 1.4.15 has a lot of changes on that function, to keep dtmf frames but I
couldn't figure out why these changes starts to cause the problem in 1.4.15
since that loop exists on both versions.<br>
<br>
Any idea?<br clear=all>
<br>
<i>Note: I used the Record() application because it has the same loop to wait
finish that my fax rx application has. I swapped them to be sure that it is not
only a problem in my application. <br>
</i><br>
-- <br>
--------------<br>
Paulo Garcia<o:p></o:p></p>
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