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Date: Mon, 21 Jul 2014 18:37:40 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] Updated: Cygwin 1.7.31-1
Message-ID: <20140721163740.GA18996@calimero.vinschen.de>
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References: <announce DOT 20140721110447 DOT GO15332 AT calimero DOT vinschen DOT de> <53CD056A DOT 8D423E81 AT boland DOT nl>
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On Jul 21 14:19, D. Boland wrote:
> Hi Corinna,
>=20
> Corinna Vinschen wrote:
> >=20
> > [Now with correct subject, sorry]
> >=20
> > Hi Cygwin friends and users,
> >=20
> > I just released Cygwin 1.7.31-1.  This is mostely a bugfix release.
> >=20
>=20
> $ uname -a
> CYGWIN_NT-5.1 dimension 1.7.31s(0.272/5/3) 20140716 11:15:29 i686 Cygwin
>=20
> With the snapshot in place, the ftp client hangs indefinitely after enter=
ing the
> password. Switching back to my old Cygwin DLL, it works again.

I could easily reproduce it.  The cause is our switch from defaulting to
PTHREAD_MUTEX_ERRORCHECK to PTHREAD_MUTEX_NORMAL to align the behaviour
more closely to Linux.

The problem is a mutex which is part of every (p)thread.  This mutex is
set to PTHREAD_MUTEX_RECURSIVE for all threads... except for the main
thread.

This is actually a long-standing bug.  By defaulting to
PTHREAD_MUTEX_ERRORCHECK the bug was just not visible.  Only by
switching to PTHREAD_MUTEX_NORMAL as default it became apparent,
so I'm rather glad this has been catched now.  This could have
subtil side-effects in multi-threaded applications.

I'm going to release a fixed 1.7.31-2 in a few minutes.


Thanks for the report,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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