[Rd] closing View windows after multiple View(x) crashes

Ben Bolker bolker at zoology.ufl.edu
Tue Jul 29 22:56:54 CEST 2008

   That works like a charm.  Thanks!

   Ben Bolker

Bill Dunlap wrote:
> On Tue, 29 Jul 2008, Ben Bolker wrote:
>>  > sessionInfo()
>> R version 2.8.0 Under development (unstable) (2008-07-07 r46046)
>> i686-pc-linux-gnu
>> ...
>> x = cbind(a=1:10,b=1:10)
>> View(x)
>> View(x)
>> View(x)
>> View(x)
>>    then try to close the latest window by clicking on the "x"
>> (close-window) icon in the corner.
>>    I can usually provoke a segmentation fault this way ...
>>    Ubuntu Hardy, up to date.
> Does it work any better for you if you edit src/modules/X11/dataentry.c
> and add a call to Rsync(DE) after the XDestroyWindow(iodisplay, DE->iowindow)
> in closewin()?
> I don't get your crash, but I have to click twice on the X button
> to get the View window to close and valgrind complains about the use
> of freed memory, DE->prot in the event loop in R_ProcessX11Events()
>             if(ioevent.xclient.message_type == _XA_WM_PROTOCOLS
>                && ioevent.xclient.data.l[0] == DE->prot) {
>                 /* user clicked on `close' aka `destroy' */
>                 done = 1;
>             }
> The trouble seems to be that this code sets done=1, causing the calls
>         closewin(DE);
>         free(DE);
> but without the Rsync call in closewin(), the window doesn't close
> immediately and later sends some messages to its event handler, causing
> the use of the freed DE.  (I sometimes use the idiom free(DE);DE=NULL;
> instead of just free(DE) to make sure no one tries to use DE afterwards,
> but valgrind does that job better.)
> When I make closewin() call Rsync(DE) then I only have to click
> once on the X button to close the View window, the event loop
> doesn't get reentered, and valgrind seems happy.
> I'm using R on "Red Hat Enterprise Linux WS release 4 (Nahant Update 3)"
> with the Cygwin X server on a Windows XP laptop.
> ----------------------------------------------------------------------------
> Bill Dunlap
> Insightful Corporation
> bill at insightful dot com
>  "All statements in this message represent the opinions of the author and do
>  not necessarily reflect Insightful Corporation policy or position."

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