Re: [Jack-Devel] Jack thread cancellation

Then how can you in any circumstances cleanly quit a thread?

Stéphane

Le 3 mai 2013 à 17:23, Paul Davis <[hidden]> a écrit :

> You should never, ever, ever rely on pthread cancellation. Not on any platform, not for any purpose.
> 
> 
> On Fri, May 3, 2013 at 11:11 AM, MONTANARO Luciano (MM) <[hidden]> wrote:
> Hi list,
> 
> I have an embedded application that makes use of jack (Version 1.9.8).
> I have started seeing crashes from the clients in the JackError() call.
> 
> The stack trace shows that the thread executing (Which is handling the
> JackSocketChannel::Execute call) receives is being killed
> (sigcancel_handler is called) and since the thread is in
> CANCEL_ASYNCHRONOUS mode, it crashes since an unsafe function is
> called (vnsprintf).
> 
> The client I am using is actually unaware of using Jack at all, it is
> using the alsa jack plugin, and it opens/closes the alsa devices many
> times during its lifetime.
> 
> Now, I have a few doubts:
> - Why are threads created with cancellation type PTHREAD_CANCEL_ASYNCHRONOUS?
>   Is this because the realtime threads need this or is there some other reason?
> - Would it be possible to mark the threads used by the JackMessageBuffer and
>   JackSocketClientChannel as PTHREAD_CANCEL_DELAYED instead?
> - Why is fThread.Kill() used in JackSocketClientChannel::Stop instead of fThread.Stop()?
>   The latter should still work, and allow the Execute() to terminate it communication
>   with the server.
> 
> Thanks in advance,
> Luciano
> --
> Luciano Montanaro
> EntryNAV - Audio Software Integrator
> Magneti Marelli Electronic Systems
> Viale Carlo Emanuele II 150, Venaria Reale (To)
> Tel. (+39) 011 6879765
> 
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