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To: cygwin@cygwin.com
Subject: Re: Possiblly bug of cygwin1.dll
In-Reply-To: <20240121201051.795a4405576a97ab8729e273@nifty.ne.jp> (Takashi
 Yano via Cygwin's message of "Sun, 21 Jan 2024 20:10:51 +0900")
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Date: Sun, 21 Jan 2024 14:30:00 +0100
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From: ASSI via Cygwin <cygwin@cygwin.com>
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Takashi Yano via Cygwin writes:
> I found the cause. In pthread.h of cygwin, PTHREAD_ONCE_INIT is defined as:
> #define PTHREAD_ONCE_INIT { PTHREAD_MUTEX_INITIALIZER, 0 }
> however, libstdc++ initializes non-static pthread_once_t using this macro.

https://www.ibm.com/docs/en/aix/7.3?topic=p-pthread-once-init-macro
https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html

"The behavior of pthread_once() is undefined if once_control has
automatic storage duration or is not initialized by PTHREAD_ONCE_INIT."

> I cannot find the POSIX statement that only static pthread_once_t can be
> initialized using PTHREAD_ONCE_INIT. If I do not overlook something,
> this is the problem of cygwin side, isn't it?

You can initialize just about anything with PTHREAD_ONCE_INIT, but you
cannot expect the resulting structure to work as intended if there is
more than instance per library / program, so the libstdc++ object should
be a singleton, not automatic.

Still looks like ATWIL to me…


Regards,
Achim.
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