Groups > comp.programming.threads > #979

Re: Using sigsetjmp/siglongjmp from multithreaded application

From	Drazen Kacar <dave@fly.srk.fer.hr>
Newsgroups	comp.programming.threads
Subject	Re: Using sigsetjmp/siglongjmp from multithreaded application
Date	2012-07-24 21:23 +0000
Organization	Čardak ni na nebu, ni na zemlji
Message-ID	<slrnk0u4ih.qi3.dave@fly.srk.fer.hr> (permalink)
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Marcel Müller wrote:
>  On 24.07.2012 19:34, Michael Podolsky wrote:
> >> Secondly you could use lock free data structures.
> >
> > Yep. I thought of it generally. Yet it looks a little overkill for
> > such a task, and, besides, I have no CAS on my platform.
> 
>  Oh, I wonder if semaphores are possible at all without CAS. AFAIK 
>  without CAS (or something similar) you are restricted to one CPU core.

There are software algorithms for mutual exclusion which don't rely on
read-modify-write instructions, like Dekker's or Lamport's algorithms.
Dekker's doesn't work with non-sequential memory model, but processors
which reorder memory access usually have read-modify-write instructions,
so it's not an issue.

-- 
 .-.   .-.    Yes, I am an agent of Satan, but my duties are largely
(_  \ /  _)   ceremonial.
     |
     |        dave@fly.srk.fer.hr

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Thread

Using sigsetjmp/siglongjmp from multithreaded application Michael Podolsky <michael.podolsky.69@gmail.com> - 2012-07-20 14:42 -0700
  Re: Using sigsetjmp/siglongjmp from multithreaded application "Ersek, Laszlo" <lacos@caesar.elte.hu> - 2012-07-21 03:32 +0200
    Re: Using sigsetjmp/siglongjmp from multithreaded application "Ersek, Laszlo" <lacos@caesar.elte.hu> - 2012-07-21 04:05 +0200
      Re: Using sigsetjmp/siglongjmp from multithreaded application Michael Podolsky <michael.podolsky.69@gmail.com> - 2012-07-24 10:22 -0700
        Re: Using sigsetjmp/siglongjmp from multithreaded application "Ersek, Laszlo" <lacos@caesar.elte.hu> - 2012-07-25 03:28 +0200
  Re: Using sigsetjmp/siglongjmp from multithreaded application Marcel Müller <news.5.maazl@spamgourmet.com> - 2012-07-21 09:10 +0200
    Re: Using sigsetjmp/siglongjmp from multithreaded application Michael Podolsky <michael.podolsky.69@gmail.com> - 2012-07-24 10:34 -0700
      Re: Using sigsetjmp/siglongjmp from multithreaded application Marcel Müller <news.5.maazl@spamgourmet.com> - 2012-07-24 22:58 +0200
        Re: Using sigsetjmp/siglongjmp from multithreaded application Drazen Kacar <dave@fly.srk.fer.hr> - 2012-07-24 21:23 +0000
        Re: Using sigsetjmp/siglongjmp from multithreaded application Michael Podolsky <michael.podolsky.69@gmail.com> - 2012-07-24 15:48 -0700

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