[mythtv-commits] Ticket #12902: Cannot make QOpenGLContext current in a different thread (occurred while watching live tv)

[MythTV]

#12902: Cannot make QOpenGLContext current in a different thread (occurred while
watching live tv)
-------------------------------------------------+-------------------------
 Reporter:  William L. DeRieux IV                |          Owner:
  <WilliamDeRieux@…>                             |
     Type:  Bug Report - Crash                   |         Status:  new
 Priority:  critical                             |      Milestone:  0.28.1
Component:  Qt5 issues                           |        Version:  0.28.0
 Severity:  high                                 |     Resolution:
 Keywords:                                       |  Ticket locked:  0
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Comment (by WilliamDeRieux@…):

 Replying to [comment:17 stuarta]:
 > Based on that analysis, that makes me think that we should be using Qt's
 signals
 > and slots to signal that up to the UI thread.
 >
 > On a side note, when looking at this, I noted that the VAAPI code does a
 > check to see if it's actually on the UI thread before doing a
 makeCurrent()
 >
 >
 https://code.mythtv.org/cgit/mythtv/tree/mythtv/libs/libmythtv/videoout_openglvaapi.cpp#n137
 >
 > which may be a potential way to identify issues like this.

 Yeah, that code in CreateVAAPIContext would probably help to check if the
 UI thread is active.

 {{{
 if (!gCoreContext->IsUIThread())
 {
     LOG(VB_GENERAL, LOG_ERR, LOC + "CreateVAAPIContext called from non-UI
 thread");
     return false;
 }
 }}}

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Ticket URL: <https://code.mythtv.org/trac/ticket/12902#comment:18>
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