[Bug stdio/21735] open_memstream is not fflushed with fflush(0)

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https://sourceware.org/bugzilla/show_bug.cgi?id=21735

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=de895ddcd7fc45caeeeb0ae312311b8bd31d82c5

commit de895ddcd7fc45caeeeb0ae312311b8bd31d82c5
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Wed Jul 12 10:53:13 2017 +0100

    Disable single thread optimization for open_memstream

    Single thread optimization is valid if at thread creation time the
    optimization can be disabled.  This is in principle true for all
    stream objects that user code can access (and thus needs locking),
    using the same internal list as fflush(0) uses.  However in glibc
    open_memstream is not on that list (BZ 21735) so the optimization
    has to be disabled.

        * libio/memstream.c (__open_memstream): Set _IO_FLAGS2_NEED_LOCK.
        * libio/wmemstream.c (open_wmemstream): Likewise.
        * nptl/tst-memstream.c: New.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog            |    7 +++
 libio/memstream.c    |    3 +
 libio/wmemstream.c   |    3 +
 nptl/Makefile        |    2 +-
 nptl/tst-memstream.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 115 insertions(+), 1 deletions(-)
 create mode 100644 nptl/tst-memstream.c

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