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Date: Wed, 30 Jan 2019 16:48:04 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: Dan Bonachea <dobonachea AT lbl DOT gov>
Cc: "E. Madison Bray" <erik DOT m DOT bray AT gmail DOT com>, cygwin AT cygwin DOT com,
        gasnet-devel AT lbl DOT gov
Subject: Re: Bug: Incorrect signal behavior in multi-threaded processes
Message-ID: <20190130154804.GJ3912@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: Dan Bonachea <dobonachea AT lbl DOT gov>,	"E. Madison Bray" <erik DOT m DOT bray AT gmail DOT com>, cygwin AT cygwin DOT com,	gasnet-devel AT lbl DOT gov
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On Jan 30 11:44, Corinna Vinschen wrote:
> On Jan 29 18:21, Dan Bonachea wrote:
> > > A minimal test program is copied below and also available here:
> > > https://upc-bugs.lbl.gov/bugzilla/attachment.cgi?id=3D589
> >=20
> > > It's worth noting POSIX 1003.1-2016 sec XRAT.B.2.4.1 (p.3577)
> > > specifically requires that any given signal should be delivered to
> > > exactly one thread. Also the spec for abort (p.565) requires the
> > > signal to be delivered as if by `raise(SIGABRT)` (p.1765) aka.
> > > `pthread_kill(pthread_self(),SIGABRT)` (p.1657), which implies
> > > any registered SIGABRT handler should run only on the thread
> > > which called abort().
> >=20
> > Poking around further, I find that replacing the signal generation
> > code in the test program for all cases with :
> >=20
> >   pthread_kill(pthread_self(),sigid)
> >=20
> > generates compliant signal delivery behavior!
>=20
> Thanks, I fixed that in Cygwin.  It will be part of the 3.0 release.

I think I have a solution for the SISEGV misbehaviour.  I have to
test it a bit but this may make it into Cygwin 3.0 if all is well.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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