[Bug libstdc++/68921] [5/6 Regression] std::future::wait() makes invalid futex calls and spins

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68921

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Dec 16 11:48:55 2015
New Revision: 231679

URL: https://gcc.gnu.org/viewcvs?rev=231679&root=gcc&view=rev
Log:
libstdc++/68921 add timeout argument to futex(2)

        PR libstdc++/68921
        * src/c++11/futex.cc
        (__atomic_futex_unsigned_base::_M_futex_wait_until): Use null pointer
        as timeout argument.

Modified:
    branches/gcc-5-branch/libstdc++-v3/ChangeLog
    branches/gcc-5-branch/libstdc++-v3/src/c++11/futex.cc