std::mutex bug: Windows handle growth

[ASSI]

Corinna Vinschen via Cygwin writes:
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71684
>
> Reading this bug report, wouldn't just defining
> _GTHREAD_USE_MUTEX_INIT_FUNC for Cygwin have the same effect?

Yes, but it would also use an initializer function instead of a static
initializer.  Whether that would have any noticeable performance impact
is unclear, but w.r.t. POSIX it's clear that it's no problem to use a
static initializer, just unspecified whether the destructor is trivial
or not.  These two issues should not be mixed up in one configuration
item IMHO.



Achim.
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