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Reduce server grabs during window creation

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Remove some obvious server grabs from the window creation codepath,
also ones that are taken at startup.

During startup, there is no need to grab: we install the event handlers
before querying for the already-existing windows, so there is no danger
that we will 'lose' some window. We might try to create a window twice
(if it comes back in the original query and then we get an event for it)
but the code is already protected against such conditions.

When windows are created later, we also do not need grabs, we just need
appropriate error checking as the window may be destroyed at any time
(or it may have already been destroyed).

The stack tracker is unaffected here - as it listens to CreateNotify and
DestroyNotify events and responds directly, the internal stack
representation will always be consistent even if the window goes away while
we are processing MapRequest or similar.

https://bugzilla.gnome.org/show_bug.cgi?id=721345
This commit is contained in:
Daniel Drake 2013-12-30 13:01:28 -06:00
parent 69dfd07a7f
commit 10c1903c72
3 changed files with 5 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/core/display.c
View File

@ -918,8 +918,6 @@ meta_display_open (void)
enable_compositor (the_display);
meta_display_grab (the_display);
/* Now manage all existing windows */
tmp = the_display->screens;
while (tmp != NULL)
@ -971,8 +969,6 @@ meta_display_open (void)
meta_idle_monitor_init_dbus ();
meta_display_ungrab (the_display);
/* Done opening new display */
the_display->display_opening = FALSE;

4
src/core/screen.c
View File

@ -887,8 +887,6 @@ meta_screen_manage_all_windows (MetaScreen *screen)
Window *children;
int n_children, i;
meta_display_grab (screen->display);
if (screen->guard_window == None)
screen->guard_window = create_guard_window (screen->display->xdisplay,
screen);
@ -907,8 +905,6 @@ meta_screen_manage_all_windows (MetaScreen *screen)
g_free (children);
meta_stack_thaw (screen->stack);
meta_display_ungrab (screen->display);
}
/**

9
src/core/window.c
View File

@ -792,11 +792,14 @@ meta_window_new (MetaDisplay *display,
return NULL;
}
/* Grab server */
meta_display_grab (display);
meta_error_trap_push (display); /* Push a trap over all of window
* creation, to reduce XSync() calls
*/
/*
* This function executes without any server grabs held. This means that
* the window could have already gone away, or could go away at any point,
* so we must be careful with X error handling.
*/
if (!XGetWindowAttributes (display->xdisplay, xwindow, &attrs))
{
@ -1437,7 +1440,6 @@ meta_window_new (MetaDisplay *display,
unminimize_window_and_all_transient_parents (window);
meta_error_trap_pop (display); /* pop the XSync()-reducing trap */
meta_display_ungrab (display);
window->constructing = FALSE;
@ -1453,7 +1455,6 @@ meta_window_new (MetaDisplay *display,
error:
meta_error_trap_pop (display);
meta_display_ungrab (display);
return NULL;
}