Subject:
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Re: Semaphore(s) locked when task killed.
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 5 Sep 2002 14:43:46 GMT
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Viewed:
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5002 times
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This has been suggested and may very well be the best way to handle manual
removal of a runaway task. I plan to investigate this once I get my current
updates squared-away.
I hope this type of handling can be done in the kernel only. User tasks
shouldn't have to deal with this low-level detail. I believe, for lnp and
memory it can be done.
// Joe
"Albert Huang" <sfitw@hotmail.com> wrote in message
news:H1xLEr.A01@lugnet.com...
> Have you considered implementing thread cleanup handlers? Similar to what
> pthread_cleanup_push and pthread_cleanup_pop provide.
>
> "Joseph Woolley" <jwoolley@spamblock.insight.rr.com> wrote in message
> news:H1w6v9.8M0@lugnet.com...
> > I have found that killing a task which is sending data via lnp will • cause
> > lnp to stop functioning. Turning the brick off then on again will get • lnp
> > working again. The issue is with the semaphore(s) used in the kernel • tasks.
> >
> > Currently there is no mechanism to track what semaphores are locked by a
> > task. When killall is used to end a task (which is commonly done) the • task
> > will terminate prior to releasing the semaphores it has locked.
> >
> > So, the question is, what is a good solution to this problem?
> >
> > I tried a quick patch for the specific issue I encountered... where
> > program.c waits for the semaphore to be released before calling killall
> > (handling the run/stop button). However, this is a poor solution since • the
> > task in question may have entered an infinite loop or encountered other • such
> > problems.
> >
> > I am working on a patch that tracks the semaphores locked by a task. • kill
> > and killall can then release the semaphores while killing the task.
> > However, there may be a better solution.
> >
> > // Joe
> >
> >
>
>
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Message is in Reply To:
 | | Re: Semaphore(s) locked when task killed.
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| Have you considered implementing thread cleanup handlers? Similar to what pthread_cleanup_push and pthread_cleanup_pop provide. "Joseph Woolley" <jwoolley@spamblock....ht.rr.com> wrote in message news:H1w6v9.8M0@lugnet.com... (...) tasks. (...) task (...) (24 years ago, 4-Sep-02, to lugnet.robotics.rcx.legos)
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