Re: [matplotlib-devel] Bugs in close('all') with the TkAgg backend

[John H. <jdh...@ac...>]

>>>>> "Fernando" == Fernando Perez <Fer...@co...> writes:

    Fernando> Fernando Perez wrote:
    >> OK, a bit more info.  It turns out that the crash happens
    >> whenever the _first_ figure window is deleted with a
    >> close(fignum) command.  So in order to really block the
    >> problem, I had to create a dummy 'sentinel' window, numbered
    >> -666, for which close() is never called.  It's OK to close this
    >> window via the window manager by clicking on its close button,
    >> but pylab.close() must NEVER be called on it.  The current code
    >> looks like this:

    Fernando> More info, sorry about the noise.  It's NOT OK to close
    Fernando> the sentinel in any way whatsoever, even via the window
    Fernando> manager.  If this window is closed, through any
    Fernando> mechanism, Tk/VTK is hosed.

Just a guess,

The problem may be arising when the backend tries to quit when the
total figure count reaches zero.  The relevant backend_tkagg section
is

    def destroy(self, *args):
        if Gcf.get_num_fig_managers()==0 and not matplotlib.is_interactive():
            if self.window is not None:
                self.window.quit()
        if self.window is not None:
            #print 'calling window destroy'
            self.window.destroy()
        self.window = None

Try playing with this function and see if you can deduce where the
problem is.

JDH