Hello folks, It looks like New Year presents still coming :-) I had replied this message 1 week ago (see below). The bottom line of that conversation: The reason of the problem is not ROOT itself rather the call to X11 system emitted from two different threads. (One from ROOT, another one from Qt). I hope your X11 system itself had been compiled with multithread option on. This problem might have been solved more less :-) transparent way if ROOT TVirtualX class would provide Qt implementation rather the direct X1. Otherwise it is end-user responsibility (see Go4 comment) to adjust things properly. Best regards, Valeri ----- Original Message ----- From: "Valeri Fine" <fine@bnl.gov> To: "Colley, Tony" <Tony.Colley@itt.com> Cc: <roottalk@pcroot.cern.ch> Sent: Friday, January 04, 2002 4:16 PM Subject: Re: [ROOT] ROOT/QtROOT within a multithreaded Qt application > > > > > The original Qt application (CSF) runs fine without adding any of the ROOT > > stuff, and I do not call any Qt functions in my added code... just ROOT (and > > ROOT definitely does not call any Qt functions). > > > > So the answer to your question, Valeri, is "yes, I have paid attention". But > > as I mentioned in the section you quoted, creating Qt widgets/dialogs from > > the simulation thread *does* work. It is TCanvas (specifically, displaying a > > TCanvas created in the simulation thread) that causes the program to segv. > > > > Ok, > Let me ask you another way. > > Qt GUI thread and the thread you make call to TCanvas (to X11 in fact) > from are one and the same or they are different? My guess they are different. > > Valeri > > > Tony > > > > -----Original Message----- > > From: Valeri Fine [mailto:fine@bnl.gov] > > Sent: Friday, January 04, 2002 14:46 > > To: Colley, Tony; roottalk@pcroot.cern.ch > > Subject: Re: [ROOT] ROOT/QtROOT within a multithreaded Qt application > > > > > > > I **am** able to create a popup window using only Qt widgets from the > > > simulation thread, so it appears that my Linux, X11R6 and Qt are properly > > > setup to support threads. I would rather not have to rewrite ROOT to use > > > only Qt widgets. > > > > > > I have looked at the Qt document "Thread Support in Qt", and at the > > Threads > > > chapter in the ROOT Users Guide, and I have looked at the roottalk > > messages > > > that were found by searching the ROOT website. I have also read through > > > http://go4.gsi.de/Threads/tthread.htm (where item 1.2.4 seems to indicate > > > that there is no hope). I may have missed something, of course, so feel > > free > > > to call me whatever names you prefer as long as you also clearly point me > > > wherever the "blatantly obvious solution" is documented. > > > > Have you paid your attention some Qt function can be called from the > > Qt GUI thread ONLY ? > > > > > > > > Any other helpful hints, suggestions, or fixes would also be appreciated. > > > > > > Tony Colley > > > > > > ITT Industries A/CD > > > Fort Wayne, IN USA > > > Tony.Colley@itt.com > > > > ************************************ > > If this email is not intended for you, or you are not responsible for the > > delivery of this message to the addressee, please note that this message may > > contain ITT Privileged/Proprietary Information. In such a case, you may not > > copy or deliver this message to anyone. You should destroy this message and > > kindly notify the sender by reply email. Information contained in this > > message that does not relate to the business of ITT is neither endorsed by > > nor attributable to ITT. > > ************************************ > > >
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