[mythtv] [PATCH] mythfrontend segfault due to NULL thread priv request

[Frank Riley]

This bug is not fixed. The problem is there is no synchronization between 
the video thread and the thread that handles the priv requests. The video 
thread that gets placed on the priv request queue is created on the stack in 
NuppelVideoPlayer::StartPlaying(). If StartPlaying() finishs (i.e. the video 
is done playing) before the priv request thread gets around to handling the 
request on the queue, pthread_setschedparam blows up because the thread 
pointer it has is now pointing into la-la land. This is easily reproducible 
(at least on my box) by going to the delete recordings screen and quickly 
scrolling through the recordings until it blows up (as long as the preview 
window is turned on). I'm guessing there is a separate thread to change the 
priority only because we only want to have to set mythfrontend as setuid. Is 
that correct?

Mark Spieth wrote:
> I was looking to delete a recording with the latest CVS with priv requests
> and got a segfault in frontend due to a null thread ptr probably due to 
> no thumbnail png file but not sure.
> anyway, attached is a robustness patch which stops the thread sched if 
> the thread ptr is null.
>  
> cheers
> mark
>  
> 
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