[mythtv-commits] Ticket #7603: mythfrontend can never connect to just waked up master backend

[MythTV]

#7603: mythfrontend can never connect to just waked up master backend
-------------------------------------+--------------------------------------
 Reporter:  bam <mybigspam@…>        |       Owner:  ijr    
     Type:  defect                   |      Status:  new    
 Priority:  minor                    |   Milestone:  unknown
Component:  MythTV - General         |     Version:  unknown
 Severity:  medium                   |     Mlocked:  0      
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 If for some reason frontend has no connection to the backend program, the
 frontend tries to re-establish it by waking up server/restarting
 backend/etc, but it can never to re-connect to it, even if the backend was
 successfully back online.[[BR]]
 The frontend's log when the master backend on the same machine is not
 running:
 {{{
 2009-11-18 20:54:45.388 Loading menu theme from
 /usr/share/mythtv/themes/defaultmenu//mainmenu.xml
 2009-11-18 20:54:45.411 Found mainmenu.xml for theme 'Retro'
 2009-11-18 20:54:46.656 MythContext: Connecting to backend server:
 192.168.1.2:6543 (try 1 of 15)
 master_wake
 2009-11-18 20:54:46.795 MythContext: Connecting to backend server:
 192.168.1.2:6543 (try 2 of 15)
 2009-11-18 20:54:46.796 MythContext: Wake-On-Lan in progress, waiting...
 2009-11-18 20:54:47.796 MythContext: Wake-On-Lan in progress, waiting...
 2009-11-18 20:54:48.797 MythContext: Wake-On-Lan in progress, waiting...
 2009-11-18 20:54:49.797 MythContext: Wake-On-Lan in progress, waiting...
 2009-11-18 20:54:50.798 MythContext: Wake-On-Lan in progress, waiting...
 }}}
 ...and so on.[[BR]]
 I have the "WOLbackendCommand" setting set to "echo master_wake" for
 debug, but even if I restart the backend by hand, nothing is changed in
 the log.[[BR]]
 The reason is that WaitForWOL() function from libs/libmyth/mythcontext.cpp
 file can never return:
 {{{
 bool MythContextPrivate::WaitForWOL(int timeout_in_ms)
 {
     int timeout_remaining = timeout_in_ms;
     while (WOLInProgress && (timeout_remaining > 0))
     {
         VERBOSE(VB_GENERAL, LOC + "Wake-On-Lan in progress, waiting...");

         int max_wait = min(1000, timeout_remaining);
         WOLInProgressWaitCondition.wait(
             &WOLInProgressLock, max_wait);
         timeout_remaining -= max_wait;
     }

     return !WOLInProgress;
 }
 }}}
 I think this is because there is no threads actually created for the WOL
 process, and the following code from mythcontext.cpp can never get
 control:
 {{{
 01679     if (we_attempted_wol)
 01680     {
 01681         QMutexLocker locker(&d->WOLInProgressLock);
 01682         d->WOLInProgress = false;
 01683         d->WOLInProgressWaitCondition.wakeAll();
 01684     }
 }}}

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Ticket URL: <http://svn.mythtv.org/trac/ticket/7603>
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