Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm 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 Date: Wed, 16 Jun 2004 02:05:23 -0400 From: Christopher Faylor To: cygwin@cygwin.com Subject: Re: Ctrl-Z fails to suspend Windows programs Message-ID: <20040616060523.GA24441@coe.casa.cgf.cx> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <87n035b3kn.fsf@eu.citrix.com> <20040615120142.GA30776@trixie.casa.cgf.cx> <40CEED71.7020407@luukku.com> <20040615131311.GB30776@trixie.casa.cgf.cx> <40CFD6E5.1070709@luukku.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40CFD6E5.1070709@luukku.com> User-Agent: Mutt/1.4.1i On Wed, Jun 16, 2004 at 08:13:09AM +0300, Jani tiainen wrote: >Christopher Faylor wrote: >>On Tue, Jun 15, 2004 at 03:37:05PM +0300, Jani tiainen wrote: >> >>>Christopher Faylor wrote: >>> >>>>On Tue, Jun 15, 2004 at 09:58:16AM +0100, John Cooper wrote: >>>> >>>>>Is it a known limitation that "native" Windows programs cannot be >>>>>suspended? >>>> >>>>Yes. Window programs do not understand cygwin signals. >>> >>>Thats true for cygwin part. Native programs still can be >>>suspended/resumed but not by cygwin (or shell that is running and >>>waiting finishing of active process). >> >> >>It is true for any part that Windows programs do not understand cygwin >>signals. >> >>There is no way to reliably suspend a Windows programs. ^^^^^^^^ > >Yes there is ( piece of pseudo code): > >For Each Thread THREAD_Y in Process PROCESS_X > Call_Win32API SuspendThread(THREAD_Y.Handle) >Next > >NOTE: In Win2k and later you need THREAD_SUSPEND_RESUME rights for >particular thread. I do have a fair amount of experience in this area. SuspendThread cannot be used to *reliably* suspend a native windows app. If you suspend the program at the wrong time you get hangs and other unwanted behavior. -- Christopher Faylor spammer? -> aaaspam@sourceware.org Cygwin Co-Project Leader aaaspam@duffek.com TimeSys, Inc. -- 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/