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Fixes for compositor replacement

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* When unmanaging a screen, stop redirecting subwindows explicitly,
  so that we do that before destroying the window manager selection
  window.
* Improve comment in the retry code
* When exiting because the previous compositor couldn't be replaced,
  don't g_error() and drop a core file.

https://bugzilla.gnome.org/show_bug.cgi?id=653121
This commit is contained in:
Owen W. Taylor 2011-06-30 15:23:41 -04:00
parent d752096cdf
commit 66a830fd46
1 changed files with 17 additions and 3 deletions
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20
src/compositor/compositor.c
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@ -489,8 +489,9 @@ meta_compositor_manage_screen (MetaCompositor *compositor,
n_retries = 0;
/* We can race with an exiting process to claim compositing over the root window;
* There's really not a great way to deal with this, so we just sleep and retry.
/* Some compositors (like old versions of Mutter) might not properly unredirect
* subwindows before destroying the WM selection window; so we wait a while
* for such a compositor to exit before giving up.
*/
while (TRUE)
{
@ -502,7 +503,12 @@ meta_compositor_manage_screen (MetaCompositor *compositor,
break;
if (n_retries == max_retries)
g_error ("Another compositing manager is running on screen %i", screen_number);
{
/* This probably means that a non-WM compositor like xcompmgr is running;
* we have no way to get it to exit */
meta_fatal (_("Another compositing manager is already running on screen %i on display \"%s\"."),
screen_number, display->name);
}
n_retries++;
g_usleep (G_USEC_PER_SEC);
@ -605,6 +611,14 @@ void
meta_compositor_unmanage_screen (MetaCompositor *compositor,
MetaScreen *screen)
{
MetaDisplay *display = meta_screen_get_display (screen);
Display *xdisplay = meta_display_get_xdisplay (display);
Window xroot = meta_screen_get_xroot (screen);
/* This is the most important part of cleanup - we have to do this
* before giving up the window manager selection or the next
* window manager won't be able to redirect subwindows */
XCompositeUnredirectSubwindows (xdisplay, xroot, CompositeRedirectManual);
}
void