[gentoo-user] Is my system (really) using nptl

[Timur Aydin]

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?

-- 
Timur