[PATCH committed] Disable single thread optimization for open_memstream

[Szabolcs Nagy]

On 14/07/17 15:06, Carlos O'Donell wrote:
> On 07/14/2017 09:01 AM, Szabolcs Nagy wrote:
>> 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.
>>
>> OK with the test?
>>
>> 2017-07-14  Szabolcs Nagy  <szabolcs.nagy@arm.com>
>> 	    Florian Weimer  <fweimer@redhat.com>
>>
>> 	* libio/memstream.c (__open_memstream): Set _IO_FLAGS2_NEED_LOCK.
>> 	* libio/wmemstream.c (open_wmemstream): Likewise.
>> 	* nptl/tst-memstream.c: New.
>>
> 
> OK to checkin if you add a pargraph comment to tst-memstream.c
> explaining the test invariants, expectations, and exactly what
> is being tested and why.
> 

committed.

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