Gstreamer and SIGTERM/SIGUSR2

[Emile Semmes]

Hi Jeff,

This is a TI issue. In the xxx_chain functions, they spawn a pthread 
that may not be getting the pipeline state change and passing that 
information along. I've experienced your probably quite a bit and it's 
basically an architectural issue with the plugin.

You will have to use SIGUSR2 as long as you run from gst-launch. 
Programmatically(sp?) creating your pipeline and performing 
GST_STATE_PAUSED, READY or NULL will get the result you desire.

So, yeah. You're stuck with SIGUSR2 as long as you use a TIxxxx element 
in your pipeline. Maybe you should cross post to the TI forum. It's a 
long shot but maybe they'll add a bit more state change detection for 
that thread. We'd all benefit from it.

https://gforge.ti.com/gf/project/gstreamer_ti/forum/?action=ForumBrowse&forum_id=187 


Emile

On 8/18/2012 1:18 PM, jlancaster wrote:
> Here's a different question or topic:
>
> In my Linux embedded app, using the TI 814x processor and TI's SDK, I use
> callback functions from a library to control gstreamer actions such as play,
> pause, record, playback, etc.
>
> In rare instances I need to remove the app using SIGTERM. This removes the
> app and the gstreamer callback library. If gstreamer is not doing anything
> it all works just dandy, gstreamer functions are restored again on app start
> up.
>
> However, if I happen to be live streaming cameras while SIGTERM is executed,
> then gstreamer does not go down very gracefully and I need to reboot to get
> all the functionality restored.
>
> If I used SIGUSR2 rather than SIGTERM everything goes down nicely and the
> functionality is also restored. Perhaps this is my solution, to use SIGUSR2,
> but it is also very curious to me.
>
> Question: Does gstreamer use any of the system SIGxxx functions to terminate
> pipelines or any other functions?
>
> Are there any theories why a SIGTERM on our app would hang gstreamer
> functions if gstreamer happens to be running?
>
> If so, can we override those function which use SIG utilities?
>
> -Jeff.
>
>
>
>
>
> --
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