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Keith Packard 7c77c42fe8 dix: Don't update current time in the middle of input event processing 
In patch 137ac094e7, Adam moved an
expensive call to UpdateCurrentTime out of the main dispatch
loop. That's a good change as the original fix from Chase was a bit
expensive. However, it breaks grab processing and so a couple of the
calls to UpdateCurrenTime need to be removed.

Input event processing can generate a stream of events; a button press
that activates a grab will send a press followed by a sequence of
enter/leave events. All of these should have the same time stamp on
the wire as they occur at the 'same' time.

More importantly, the grab time recorded in the device is pulled from
currentTime after all of the events are delivered, so if currentTime
doesn't match the time in the device event, then future grab
modifications will fail as the time marked in the device will be
'later' than the grab time known to the client (which is defined as
the timestamp from the activating input event).

A bit of history here -- it used to be that currentTime was driven
*entirely* by input events; those timestamps didn't even have to be
related to the system time in any way. Then we started doing ICCCM
stuff and people got confused when PropertyNotify events would have
the same timestamp even when delivered minutes apart because no input
events were delivered.

We added code in the server to go update the time, but only if no
input events were pending (so that the clock "wouldn't" go
backwards). The only places where this is necessary is in request
processing which may generate an event with a timestamp, and there
only at the very top of the request processing code so that the whole
request would be processed at the 'same time', just like events.

cc: Chase Douglas <chase.douglas@canonical.com>
cc: Peter Hutterer <peter.hutterer@who-t.net>
cc: Adam Jackson <ajax@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
2016-06-01 10:31:52 -07:00
composite dix: Remove pointless client-state callbacks 2016-05-11 11:21:08 -04:00
config Remove SIGIO support for input [v5] 2016-05-26 16:07:54 -07:00
damageext dix: Remove pointless client-state callbacks 2016-05-11 11:21:08 -04:00
dbe Convert top level extensions to new *allocarray functions 2015-04-21 16:57:08 -07:00
dix dix: Don't update current time in the middle of input event processing 2016-06-01 10:31:52 -07:00
doc doc: Convert an \fP pair into appropriate tags. 2015-09-23 10:32:53 -04:00
dri3 dri3: remove unused file dri3int.h 2016-04-18 11:26:36 -04:00
exa EXA: Honour op parameter to exaGlyphs even if maskFormat == NULL 2016-05-09 12:41:13 -04:00
fb Fix alphamap interactions with wfb 2015-09-29 12:21:34 -04:00
glamor glamor: Adjust for drawable x/y in composite's copy optimization 2016-05-27 13:24:39 -07:00
glx glx: Stop tracking hasUnflushedCommands 2016-05-11 11:23:20 -04:00
hw xwayland: Use the CLOCK_MONOTONIC clock 2016-05-31 08:44:38 +10:00
include xwayland: Use the CLOCK_MONOTONIC clock 2016-05-31 08:44:38 +10:00
m4 Add ax_pthread.m4 to m4/ 2016-05-29 19:20:51 -07:00
man Xserver.man: document more transports for -nolisten & -listen options 2015-10-28 14:16:28 -04:00
mi mi: Grow event queue while reading events 2016-05-26 16:07:54 -07:00
miext damage: Make damageRegionProcessPending take a damage not a drawable 2016-05-18 15:25:44 -04:00
os os: Initialize NotifyFds earlier in startup 2016-06-01 10:31:52 -07:00
present present: Only requeue for next MSC after flip failure 2016-03-24 15:47:33 -04:00
pseudoramiX Convert top level extensions to new *allocarray functions 2015-04-21 16:57:08 -07:00
randr randr/provider: only allow slave gpu to be offload sources. 2016-05-04 15:33:10 -04:00
record record: don't call RecordDeleteContext when AddResource fails 2016-03-08 10:20:04 -05:00
render dix: Remove pointless client-state callbacks 2016-05-11 11:21:08 -04:00
test test: Actually verify that two equivalent touch points are the same 2016-05-29 18:43:16 -07:00
Xext dix: Remove pointless client-state callbacks 2016-05-11 11:21:08 -04:00
xfixes dix: Remove pointless client-state callbacks 2016-05-11 11:21:08 -04:00
Xi Remove SIGIO support for input [v5] 2016-05-26 16:07:54 -07:00
xkb xkb: Hold input lock across injected key event processing 2016-05-26 16:07:54 -07:00
.dir-locals.el Add .dir-locals.el 2013-08-17 12:17:36 +02:00
.gitignore .gitignore: Add new autotools file 'test-driver' 2014-04-21 13:41:42 -07:00
autogen.sh autogen: Set a default subject prefix for patches 2016-02-08 17:41:38 -05:00
configure.ac xwayland: Use the CLOCK_MONOTONIC clock 2016-05-31 08:44:38 +10:00
COPYING modesetting: Merge modesetting's COPYING into the xserver's. 2014-09-15 12:46:02 -07:00
devbook.am doc: Create a script to filter xmlto output 2015-01-05 14:24:06 -08:00
docbook.am docbook.am: embed css styles inside the HTML HEAD element 2011-09-21 14:07:49 -07:00
fix-miregion Change region implementation names to eliminate the 'mi' prefix 2010-06-05 17:47:32 -07:00
fix-miregion-private Change region implementation names to eliminate the 'mi' prefix 2010-06-05 17:47:32 -07:00
fix-patch-whitespace Rename region macros to eliminate screen argument 2010-06-05 18:59:00 -07:00
fix-region Rename region macros to eliminate screen argument 2010-06-05 18:59:00 -07:00
Makefile.am DIST_SUBDIRS needs to include glamor, even if it isn't built 2014-02-13 15:25:56 -08:00
manpages.am Xorg: Add a suid root wrapper 2014-03-12 08:50:05 +01:00
README packaging: provide a default README file #24206 2010-01-27 14:00:17 -08:00
xorg-server.m4 macros: clarify documentation 2012-11-05 13:24:57 -06:00
xorg-server.pc.in xfree86: link modules against Xorg symbols on Cygwin 2012-04-05 21:57:07 -05:00
xserver.ent.in doc: relocate xserver.ent in the package root directory 2011-05-14 11:22:26 -07:00

README 

					X Server

The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.

Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.

For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server

All questions regarding this software should be directed at the
Xorg mailing list:

        http://lists.freedesktop.org/mailman/listinfo/xorg

Please submit bug reports to the Xorg bugzilla:

        https://bugs.freedesktop.org/enter_bug.cgi?product=xorg

The master development code repository can be found at:

        git://anongit.freedesktop.org/git/xorg/xserver

        http://cgit.freedesktop.org/xorg/xserver

For patch submission instructions, see:

	http://www.x.org/wiki/Development/Documentation/SubmittingPatches

For more information on the git code manager, see:

        http://wiki.x.org/wiki/GitPage