Patch that "fixes" compositor-x11

[Prigent, Christophe]

Hello,

I'm also having the problem.

I'm using Ubuntu 11.04. My computer is quite powerful (Intel core i5, 4GiB memory, graphic card: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller)

-----Original Message-----
From: wayland-devel-bounces+christophe.prigent=intel.com at lists.freedesktop.org [mailto:wayland-devel-bounces+christophe.prigent=intel.com at lists.freedesktop.org] On Behalf Of Bill Spitzak
Sent: Monday, June 04, 2012 10:38 PM
To: wayland
Subject: Re: Patch that "fixes" compositor-x11

Any comments or insight on this problem?

I'm wondering if the slowness of compositor-x11 is a problem that only I am encountering? If everybody else is using much faster machines perhaps they won't see it, though I think if you run enough clients it should be obvious on any machine. Is there something wrong with my version of X or xcb? (I am using a stock 11.4 Ubuntu).

I would be concerned that this bug may lead to developers accidentally writing code that assumes the "deferred" calls are done after each event, rather than after blocks of events.

I have tried equivalent printf statements at other points in the code, such as in weston/client/window.c event loop, and they did not fix the speed problems. Therefore it appears the print statements must be before
  whatever is done after x11_compositor_handle_event() returns.

As accurately as I can describe what I am seeing:

  In my current version of weston compositor-x11, the static function
x11_compositor_next_event() always returns NULL after it returns non-null when it is called by x11_compositor_handle_event(). It will do this even if there are hundreds of X events queued up from moving the mouse.

  Adding an apparently-useless print statment, *after* the test, causes
x11_compositor_next_event() to return non-null more than once (up to 15 in my tests).

  The print statement must be "complex", possibly the requirement is that it causes scrolling in the gnome terminal I am sending stdout to.

  Moving the print statement to other apparently-equivalent places in the code, in particular to weston/client/window.c, does not fix the problem.
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