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Date: Wed, 8 Jul 2015 10:16:47 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.1.0-0.4
Message-ID: <20150708081647.GD2918@calimero.vinschen.de>
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References: <5599E4C5.1010109@cornell.edu> <20150706100158.GJ2918@calimero.vinschen.de> <559A7F74.1000402@cornell.edu> <20150706144555.GR2918@calimero.vinschen.de> <559AA4C8.30309@cornell.edu> <20150706163424.GV2918@calimero.vinschen.de> <20150707154916.GB2918@calimero.vinschen.de> <559C14D2.1000303@cornell.edu> <20150707184952.GA27472@calimero.vinschen.de> <559C2A75.4070602@cornell.edu>
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On Jul  7 15:37, Ken Brown wrote:
> On 7/7/2015 2:49 PM, Corinna Vinschen wrote:
> >I spoke too soon.  This *is* a result of the alternate stack handling.
> >When the exception occurs while running on the alternate stack, the OS
> >exception handler checks if the stack pointer is valid, and since it's
> >not in the stackarea as stored in the TEB, it treats the stack as
> >corrupted.  That's why it stops calling the SEHs.
> >
> >In the meantime I found a workaround for this problem with only a very
> >marginal performance hit.  I applied it to the repo and I'm just in the
> >process of creatsing new snapshots.  If the snapshots work for you I
> >create another test release.
>=20
> They work for me.  I guess I can go ahead and file that emacs bug report.
> Thanks.

Thank you.  Btw., if you want to be really sure that pthread_getattr_np
recovers from an uninitialized or invalid pthread_attr_t argument, just
initialize it like this:

  pthread_attr_t attr =3D { 42 };

This gives a compile time warning, but it makes sure that the internal
validity check SEGVs and the exception handling kicks in.

I'll release a new test version today.


Thanks,
Corinna

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

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