[Bug nptl/17980] sem_* interoperability between 32bit and 64bit binaries

[aurelien at aurel32 dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=17980

Aurelien Jarno <aurelien at aurel32 dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://bugs.debian.org/816
                   |                            |742
                 CC|                            |aurelien at aurel32 dot net

--- Comment #2 from Aurelien Jarno <aurelien at aurel32 dot net> ---
The issue has been introduced by the following commit:

commit 042e1521c794a945edc43b5bfa7e69ad70420524
Author: Carlos O'Donell <carlos@systemhalted.org>
Date:   Wed Jan 21 00:46:16 2015 -0500

    Fix semaphore destruction (bug 12674).

    This commit fixes semaphore destruction by either using 64b atomic
    operations (where available), or by using two separate fields when only
    32b atomic operations are available.  In the latter case, we keep a
    conservative estimate of whether there are any waiting threads in one
    bit of the field that counts the number of available tokens, thus
    allowing sem_post to atomically both add a token and determine whether
    it needs to call futex_wake.

    See:
    https://sourceware.org/ml/libc-alpha/2014-12/msg00155.html

It is still reproducible with glibc 2.23 or current git master branch.

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