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Message-ID: <406b3882-15be-4d24-945c-42f1e2715e87@gmail.com>
Date: Tue, 17 Mar 2026 09:06:39 +0200
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: std::mutex bug: Windows handle growth
To: Frank Eskesen <feskesen AT hvc DOT rr DOT com>,
        Cygin Mailing List <cygwin AT cygwin DOT com>
References: <2d48a740-ce2b-4259-8947-f5c875dd1672 AT hvc DOT rr DOT com>
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From: Noel Grandin via Cygwin <cygwin AT cygwin DOT com>
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Hi

Hazarding a guess here:

On 3/16/2026 11:39 PM, Frank Eskesen via Cygwin wrote:
> 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. This sample program demonstrates the problem, failing in under 60
This code looks suspicious:

     pthread_mutex::destroy ()
     {
       if (condwaits || trylock ())
         // Do not destroy a condwaited or locked mutex
         return EBUSY;

I think it should be

       if (condwaits || !trylock ())

Regards, Noel Grandin

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