Subj : Re: Strange behaviour
To   : comp.programming.threads
From : sunglo
Date : Tue Apr 19 2005 03:03 pm

>> I'm using linux 2.6 with NPTL.

> On which distro?

gentoo. This is what /lib/libc.so.6 shows:

GNU C Library 20041102 release version 2.3.4, by Roland McGrath et al.
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 3.3.5  (Gentoo Linux 3.3.5-r1, ssp-3.3.2-3,
pie-8.7.7.1).
Compiled on a Linux 2.6.8 system on 2005-03-25.
Available extensions:
        GNU libio by Per Bothner
        crypt add-on version 2.1 by Michael Glad and others
        Native POSIX Threads Library by Ulrich Drepper et al
        The C stubs add-on version 2.1.2.
        GNU Libidn by Simon Josefsson
        BIND-8.2.3-T5B
        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Thread-local storage support included.
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.

> Did you got that behavior with LinuxThreads? (export the environment
> variable LD_ASSUME_KERNEL to 2.4.19 before executing your
> process).

That machine is a NPTL-only, so I can't test the program there. But
yes, on another (linuxthread) box the code works OK.

> Seems to be an issue in the NPTL you are using.

Searching for bugs on the glibc lists, I found bug 530
(http://sources.redhat.com/bugzilla/show_bug.cgi?id=530), which seems
to describe my problem. But I'm not sure whether it applies to my
version of glibc.

Thanks for your answer.

.