X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-2.1 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Date: Mon, 11 May 2009 09:23:42 -0500 From: Brian Ford Reply-To: cygwin@cygwin.com To: cygwin@cygwin.com Subject: Re: How to detect a cygwin thread? In-Reply-To: <9f8a01cd0905101707x2b91f1edg33ae17ec82ab722e@mail.gmail.com> Message-ID: References: <9f8a01cd0905091706s6944a639m8da2f943212cc178@mail.gmail.com> <9f8a01cd0905100245m16838bb9w3c6e494d4a03a4cb@mail.gmail.com> <20090510202132.GB25909@ednor.casa.cgf.cx> <9f8a01cd0905101533i2902636aub172298be61599a5@mail.gmail.com> <20090510233629.GC25909@ednor.casa.cgf.cx> <9f8a01cd0905101707x2b91f1edg33ae17ec82ab722e@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Mon, 11 May 2009, Piotr Wyderski wrote: > Christopher Faylor wrote: > > > Yes, that's the signal thread but I don't know why stopping it would > > cause any special problems since, if the entire program is stopped, it > > isn't going to be processing signals. > > I don't know the reason, just report the program's > behaviour. But to provide you more context: this > code is a critical error handler. All it has to do is: > > 1. immediately stop the world in a nice way, > as this thread is all about. When "sig" is suspended, > no more points follow. > > 2. dump detailed stack traces + module list + > the emergency stop reason description to > the set of log files; My WAG is: http://www.cygwin.com/ml/cygwin-developers/2007-10/msg00040.html A handshake with the signal thread is required for many Cygwin system calls to proceede. > The need for parsing DWARF sections by the > user himself is a difficult and painstaking challenge. Have you considered libdwarf? I have a build that works using a custom minimal libelf stub library. I don't use if for back traces at the moment, but it can read symbolic program variable information. -- Brian Ford Staff Realtime Software Engineer VITAL - Visual Simulation Systems FlightSafety International the best safety device in any aircraft is a well-trained crew... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/