Groups > comp.programming.threads > #980

Re: Using sigsetjmp/siglongjmp from multithreaded application

From	Michael Podolsky <michael.podolsky.69@gmail.com>
Newsgroups	comp.programming.threads
Subject	Re: Using sigsetjmp/siglongjmp from multithreaded application
Date	2012-07-24 15:48 -0700
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On Jul 24, 4:58 pm, Marcel Müller <news.5.ma...@spamgourmet.com>
wrote:

> Oh, I wonder if semaphores are possible at all without CAS. AFAIK
> without CAS (or something similar) you are restricted to one CPU core.

I actually have one core. Even if you have many cores, you can
implement
the kernel and all the things around having a spinlock.

> Hmm, the basic instruction of a spin-lock is CAS, isn't it?

No it is not. For instance, for i86, "lock xchg" is enough. Just have
a zero value for non-locked spinlock and exchange it with 1 when you
attempt locking. Then analyze the old value. ))

Thanks,
Michael

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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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