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Date:	Mon, 22 Jan 2024 10:25:28 +0100
To:	cygwin AT cygwin DOT com
Subject:	Re: Possiblly bug of cygwin1.dll
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Jan 22 12:30, Takashi Yano via Cygwin wrote:
> PATCH2: (for cygwin)
> Avoid handle leak caused when non-static pthread_once_t is initialized
> with PTHREAD_ONCE_INIT
> diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
> index 7bb4f9fc8..127569160 100644
> --- a/winsup/cygwin/thread.cc
> +++ b/winsup/cygwin/thread.cc
> @@ -2060,6 +2060,9 @@ pthread::once (pthread_once_t *once_control, void (*init_routine) (void))
>      {
>        init_routine ();
>        once_control->state = 1;
> +      pthread_mutex_unlock (&once_control->mutex);
> +      while (pthread_mutex_destroy (&once_control->mutex) == EBUSY);
> +      return 0;
>      }
>    /* Here we must remove our cancellation handler */
>    pthread_mutex_unlock (&once_control->mutex);

I see what you're doing here.  Wouldn't it be simpler, though, to do this?

diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index 7bb4f9fc8341..7ec3aace395d 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -2063,6 +2063,7 @@ pthread::once (pthread_once_t *once_control, void (*init_routine) (void))
     }
   /* Here we must remove our cancellation handler */
   pthread_mutex_unlock (&once_control->mutex);
+  while (pthread_mutex_destroy (&once_control->mutex) == EBUSY);
   return 0;
 }


Corinna

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