[vlc-devel] vlc locks up intermittantly

[Tony Anecito]

Thanks Pierre,
   
  I am not a gcc/gdb expert just a simple java developer trying to integrate jvlc into a project of mine.
  I have been able to compile vlc and am willing to add/modify my local copy of vlc source (dated 6/10) to help pin down the root cause and will try to understand half of what you say.
  So go and suggest and I will try to work on it today after I finish my projects around the house and full time tonight when I can.
   
  Regards,
  -Tony Anecito

Pierre d'Herbemont <pdherbemont at free.fr> wrote:
  Err, I was of course speaking of gdb and not gcc.

Pierre.

On 24 juin 07, at 16:09, Pierre d'Herbemont wrote:

> Hello Tony,
>
> Could you backtrace the different thread using gcc [1]. There are
> some part of the libvlc's playlist code that are not really thread
> safe (for instance [2]). And some other that may be the source of
> your dead lock [3]. But a backtrace would certainly help more.
>
> Pierre.
>
> [1]
> $ gcc attach 
> $ thread 1
> $ bt
> $ thread 2
> $ bt
> ...
>
> [2] control/playlist.c:70
>
> if (! playlist_was_locked( p_instance ) )
> {
> playlist_mark_locked( p_instance, 1 );
> vlc_mutex_lock( &PL->object_lock );
> did_lock = 1;
> }
>
> Here we could mark_locked and already locked instance. Hence this is
> really not thread safe.
>
> [3]
> p_item = playlist_ItemGetByInputId( PL, i_id,
> PL->status.p_node );
> if( !p_item )
> {
> if( did_lock == 1 )
> {
> vlc_mutex_unlock( &PL->object_lock );
> playlist_mark_locked( p_instance, 0 );
> }
> RAISEVOID( "Unable to find item" );
> }
> Here we could simply forget to unlock the PL object. But you should
> get an exception though.
>
>
> On 24 juin 07, at 12:02, Tony Anecito wrote:
>
>> After some more testing I noticed that when using -vvv I get a
>> debug message about adding to the playlist after I tried to play
>> the video. This happens with either files from the disk or
>> streaming videos. I am wondering if it is possible that there is a
>> race condition in vlc when calling playlist.add() then playlist.play
>> () in code. It seemed the error was less of a problem after I added
>> some print statements between the add then play function calls.
>>
>> Regards,
>> -Tony
>>
>> Tony Anecito wrote:
>> Hi All,
>>
>> I am testing running two child windows in jvlc bindings and I am
>> seeing interesting error condition where if I continously switch
>> back and forth between child windows that are running videos (in
>> java I have to get a new vlc instance because the switching between
>> child windows causes the jre to destroy the window ie. peer to the
>> canvas) I eventually get a condition where after executing
>> playlist.play() several times the method does not seem to return
>> and blocks the redraws of the screen.
>>
>> I get this interesting warning when playlist.play() is executed and
>> never returns from the play method. I am using 0.9.0b from just
>> before the names were changing to media-center?
>>
>> Thanks for any help. -Tony
>> [00001242] mp4 demuxer warning: elst old=0 new=1
>>
>>
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>>
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