[PATCH] Disable single thread optimization for open_memstream

[Florian Weimer]

On 07/12/2017 04:09 PM, 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.
> 
> 2017-07-12  Szabolcs Nagy  <szabolcs.nagy@arm.com>
> 
> 	* libio/memstream.c (__open_memstream): Set _IO_FLAGS2_NEED_LOCK.
> 	* libio/wmemstream.c (open_wmemstream): Likewise.

What about the test case I posted?

Florian