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To:	cygwin AT cygwin DOT com
Subject:	Re: std::mutex bug: Windows handle growth
In-Reply-To:	<2d48a740-ce2b-4259-8947-f5c875dd1672@hvc.rr.com> (Frank Eskesen
	via Cygwin's message of "Mon, 16 Mar 2026 17:39:49 -0400")
References:	<2d48a740-ce2b-4259-8947-f5c875dd1672 AT hvc DOT rr DOT com>
Date:	Sat, 21 Mar 2026 21:06:58 +0100
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From:	ASSI via Cygwin <cygwin AT cygwin DOT com>
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Frank Eskesen via Cygwin writes:
> I've run into a problem that occurs on Cygwin that doesn't occur on
> Linux systems: When a std::mutex is used, it doesn't clean up a
> Windows handle that it uses.

I've applied the fix provided by Corinna and built a test version on top
of the current gcc-13.4 snapshot.  Please test.

https://repo.or.cz/gcc/cygwin-gcc.git/commitdiff/f3429b7ec960fea9df62bc3c14e257d60fe436f0

The bug was already reported upstream a long time ago as FreeBSD also
has an implementation where the mutex can not be destroyed trivially:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71684

POSIX does not make such a guarantee, but there also is no feature test
macro, so it must eventually become a platform specific configuration.



Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

DIY Stuff:
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