From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] rt_task_delete() question
Date: Thu, 30 Mar 2006 23:05:26 +0200 [thread overview]
Message-ID: <442C4816.6030509@domain.hid> (raw)
In-Reply-To: <442C42B5.2070506@domain.hid>
Jan Kiszka wrote:
> Sean McGranaghan wrote:
>
>>Hello all,
>>
>>I am posting this for a co-worker who is having problems with killing a
>>real-time task. (He is joining the email list shortly but for now I will pass
>>responses on to him.) Here is the scenario:
>>
>>1. A Linux process starts up and detaches from the tty (daemon)
>>2. The daemon creates a xeno message queue
>>2. The daemon spawns a xeno task
>>3. The xeno task on startup binds to the queue rt_queue_bind()
>>4. The xeno task waits on the queue recv with infinite timeout
>>5. The daemon process goes to sleep in a join, waiting for the task to exit
>>6. Some time later another program starts
>>7. The other non-realtime program looks up the xeno task name via rt_task_bind()
>>8. The other non-realtime program attempts to delete the task via rt_task_delete()
>> Failed Attempt #1 - Non-realtime program calls rt_task_delete() and gets
>> a segmentation fault
>> Failed Attempt #2 - Non-realtime program spawns a realtime task which
>> binds to original task and tries rt_task_delete().
>> Also gets segmentation fault.
>>
>>The was attempted one a system running the latest Xenomai 2.1 release.
>>
>>What is the preferred method to start/join threads from a non-realtime context?
>>
>>Any help is appreciated.
>>
>
>
> rt_task_delete is not supposed to work across processes (Hmm, is this
> detail documented somewhere?).
>
Nope, basically because I totally overlooked the issue... but we should
make this possible, since rt_task_suspend() is already system-scoped.
Ok, this one is on my todo list.
> Use a normal Linux signal (e.g. SIGTERM) to terminate the daemon
> process. For a clean termination, you should install a signal handler in
> the daemon process which triggers an organised clean-up (all
> RT-resources except tasks have to be released explicitly).
>
> Jan
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
--
Philippe.
next prev parent reply other threads:[~2006-03-30 21:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-30 17:48 [Xenomai-help] rt_task_delete() question Sean McGranaghan
2006-03-30 20:42 ` Jan Kiszka
2006-03-30 21:05 ` Philippe Gerum [this message]
2006-03-31 12:12 ` Sean McGranaghan
2006-03-31 10:22 ` Philippe Gerum
2006-03-31 14:20 ` Philippe Gerum
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