On Mon, Mar 25, 2013 at 03:53:06AM +0100, Sebastian Ramacher wrote:
> On 2013-03-24 07:28:03, Marwan Tanager wrote:
> > While browsing the bug tracker for related issues, I found the one at
> > http://bugs.pwmt.org/issue95 which points out the 0.0.8.5 version as not
> > suffering from this problem. I built it and experimented. The result was
> > that
> > the total amount of memory consumed by scrolling through the length of the
> > 1300-pages document was comparable to the one with this patch. So, there
> > must
> > be something messy happening with cairo_surface_destroy when it's get
> > called
> > from the timeout function while scrolling. Maybe it's non-reentrant and
> > some
> > mess happens when it's called concurrently from both the timeout function
> > and
> > the render thread. But if that's the case, then why doesn't it free the
> > memory
> > after the first time, even when there is no scrolling? Also, I tried to
> > experiment with mutexes around the cairo_surface_destroy calls on the
> > render
> > thread and zathura_page_widget_update_surface but nothing surprising has
> > happened.
>
> I played a bit with the code tonight. What puzzles me is that it works
> for the first time but not for any subsequent purge operations. As far
> as I can tell, the ref counters of the surface are 1 and thus
> cairo_surface_destroy should free the image. cairo_surface_destroy is
> definitely called, but I really don't know why nothing happens [1].
I've done exactly the same test and made sure the ref count is always 1 before
the call. That's exactly what drove me nuts!
Marwan
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