[mythtv] [patch] Fix for sluggish pause

[Doug Larrick]

David Engel wrote:
>>As an aside, I think what's happening on my system is that it's fast 
>>enough (specced for HD content, playing NTSC) and a dual-processor 
>>(well, HyperThreaded), so that the sched_yield() often sees no other 
>>runnable threads *for that processor* and immediately returns.
> 
> 
> That's the problem!  Try changing the decoder_lock from a QMutext to a
> pthread_mutex_t and see if that helps.  I suspect it will, and will
> also get rid of the sched_yield which I didn't like anyway.  If you
> can't make the change, I will do it tonight.

I'll give it a try.  I might be able to get to this tonight.

-Doug
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