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List:       mtvp-sdk
Subject:    Re: question about mtv and threads
From:       Tristan Savatier <tristan () mpegtv ! com>
Date:       1998-09-30 19:37:51
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To subscribers of the mtvp-sdk@mpegtv.com mailing list:

Andrew V. Shuvalov wrote:
> 
> Hi,
> 
> > > Hi!
> > >     What are specific threads of the Player? I have:
> > >   935  p3 R    0:10 mtvp  -r11,13,0,0,14,15,0,0
> > >   936  p3 S    0:00 mtvp  -r11,13,0,0,14,15,0,0
> > >   937  p3 S    0:01 mtvp  -r11,13,0,0,14,15,0,0
> > >   938  p3 S    0:07 mtvp  -r11,13,0,0,14,15,0,0
> > >   941  p3 S    0:00 mtvp  -r11,13,0,0,14,15,0,0
> >
> > main thread (parse systems stream and decode video)
> > audio thread (decode and play audio)
> > input thread (fills-up the bits in the buffers)
> > display thread (display video) - only in version 1.0.7.2 and later
> > control thread (created by the thread library)
> 
> And wich one thread loads my SIH plugin?  I guess input thread.

The main thread loads the SIH plugin.  The input thread
(started by the main thread) calls only SIH_read.

All the other routines of the SIH plugin are called from the
main thread.  But it is guaranteed that SIH_read and another routine
of an SIH plugin are never called concurently (i.e.
at the same time).

In other words, while the input thread is running, only
SIH_read is called.

When another SIH routine must be called (e.g. SIH_lseek), the input
thread
is stopped first, and restarted after the call has returned.


> > > After i try to kill Player, those still remains:
> > >
> > >   937  p3 S    0:01 mtvp  -r11,13,0,0,14,15,0,0
> > >   938  p3 S    0:10 mtvp  -r11,13,0,0,14,15,0,0
> 
> Input thread may be blocked by some select calls?

Yes.  the input thread blocks until there is data available on
the fd returned by SIH_fd (or until a private command is issued
by the main thread to the input thread, for example termination
command).

-t
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