On Fri, Oct 12, 2012 at 8:24 AM, Timur Aydin <t...@taydin.org> wrote: > Hi, > > I have done many tests on my ~x86 system to confirm that it is nptl based: > > - I have the nptl and nptlonly use flags in my make.conf and my system > is up to date. > > - Running /lib/libc.so.6 shows: > > ta@bonsai ~ $ /lib/libc.so.6 > GNU C Library stable release version 2.15, by Roland McGrath et al. > Copyright (C) 2012 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 4.5.3. > Compiled on a Linux 3.5.0 system on 2012-09-10. > Available extensions: > C stubs add-on version 2.1.2 > crypt add-on version 2.1 by Michael Glad and others > Gentoo patchset 21 > GNU Libidn by Simon Josefsson > Native POSIX Threads Library by Ulrich Drepper et al > Support for some architectures added on, not maintained in glibc > core. > BIND-8.2.3-T5B > libc ABIs: UNIQUE IFUNC > For bug reporting instructions, please see: > <http://www.gnu.org/software/libc/bugs.html>. > > - getconf also indicates nptl: > > ta@bonsai ~ $ getconf GNU_LIBPTHREAD_VERSION > NPTL 2.15 > > > Yet, when I look at the process list, I am seeing all programs that use > threads having uniquey pid's for each thread. I even compiled a simple > program that just creates 5 threads, each sleeping forever. Again, each > thread had a unique pid. > > I have also checked the kernel config. FUTEX support was enabled, but > the top level selector (EXPERT options) was not selected. I guess the > top level selector just exposes the FUTEX selector and doesn't really > affect whether it is enabled or not. > > So, what I am wondering now, is my system configured for NPTL or not?
You arouse my curiosity. Maybe there is a bug in glibc in ~x86; I'm running stable (but with vanilla sources 3.6.0), and I have basically the same setup as you: my glibc states that it has NTPL, getconf also says it so, and I have FUTEX support enabled. I just don't set ntpl nor ntplonly in my use flags (I was under the impression they were enabled by default). My little program with 5 threads gets listed as a single PID in my "ps x" output. sys-libs/glibc-2.15-r2, no use flags set (except for multilib, which is mandatory) sys-kernel/vanilla-sources-3.6.1 Regards. -- Canek Peláez Valdés Posgrado en Ciencia e Ingeniería de la Computación Universidad Nacional Autónoma de México
