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	Sat, 19 Sep 2026 20:36:01 -0700 (PDT)
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To:	cygwin AT cygwin DOT com
Subject:	Re: std::mutex bug: Windows handle growth
Date:	Sun, 20 Sep 2026 03:35:58 +0000
In-Reply-To:	<abmnASrGinx_OnuY@calimero.vinschen.de>
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From:	kikairoya via Cygwin <cygwin AT cygwin DOT com>
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X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 68K3b4tE729651

Hi,

std::shared_mutex (actually, __shared_mutex_pthread) appears to need a similar fix.
Could you take a look?


2026年3月18日 4:09:53 (+09:00) で、Corinna Vinschen via Cygwin さんが書きました:
> 
> The actual problem here is the `#ifdef __GTHREAD_MUTEX_INIT'.
> 
> __GTHREAD_MUTEX_INIT translates into PTHREAD_MUTEX_INIT.  If this is
> defined, you will notice the there's *no* destructor defined for class
> __mutex_base.  Apparently the assumption is made that the underlying
> pthread_mutex_t type is a trivial type which doesn't need a destroy(),
> if PTHREAD_MUTEX_INIT exists.
> 
> However, this is wrong for Cygwin.  It defines PTHREAD_MUTEX_INIT, but
> it still needs a pthread_mutex_destroy() call, because the pthread_mutex_t
> type is not a trivial one.
> 
> Thus, we need a destructor even if __GTHREAD_MUTEX_INIT is defined.
> 
> A potential fix would be 
> 
> diff --git a/libstdc++-v3/include/bits/std_mutex.h b/libstdc++-v3/include/bits/std_mutex.h
> index 7ef33fe5d0d7..f060c75abf21 100644
> --- a/libstdc++-v3/include/bits/std_mutex.h
> +++ b/libstdc++-v3/include/bits/std_mutex.h
> @@ -68,6 +68,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>      __native_type  _M_mutex = __GTHREAD_MUTEX_INIT;
>  
>      constexpr __mutex_base() noexcept = default;
> +#ifdef __CYGWIN__
> +    ~__mutex_base() noexcept { __gthread_mutex_destroy(&_M_mutex); }
> +#endif
>  #else
>      __native_type  _M_mutex;
> 

-- 
Tomohiro Kashiwada (@kikairoya)

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