To: corbet-lwn@eklektix.com
Subject: threads
Date: Wed, 13 May 1998 11:58:09 -0500
From: Jonathan Corbet <corbet@atd.ucar.edu>

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From: Xavier Leroy <Xavier.Leroy@see.my.sig.for.address>
Newsgroups: comp.programming.threads,comp.os.linux.development.system
Subject: Re: linuxthreads and scheduling
Date: 13 May 1998 08:46:36 +0000
Organization: INRIA Rocquencourt, projet Cristal
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Stuart Hughes <sehughes@mistral.co.uk> writes:

> I just got David Butenhof's programming with POSIX threads which I
> highly recommend.  I'm having a problem getting some of the examples to
> run.  Although the calls to set the scheduling to FIFO don't return
> errors, when I do a pthread_getschedparam nothing seems to have changed.

You're probably using LinuxThreads 0.5 on a x86 processor.  This
version has a bug in an asm wrapper that causes pthread_setschedparam
to do nothing.  Your program works fine under LinuxThreads 0.7.

> I am running as root, on a redhat 4.2 that has been upgraded to kernel
> 2.0.33 and libc 5.4.44.

The best thing to do is to upgrade to RedHat 5.0, which has much
better thread support (glibc 2 and LinuxThreads 0.7).  If you want to
stay with libc 5, you can still find a more recent version of
LinuxThreads at
ftp://ftp.inria.fr/INRIA/Projects/cristal/Xavier.Leroy/linuxthreads.tar.gz

- Xavier Leroy

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