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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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Checked in the following released items:
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+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, sublicense, and/or sell copies of the Software, and to
+.\" permit persons to whom the Software is furnished to do so, subject to
+.\" the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included
+.\" in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+.\" OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from the X Consortium.
+.\"
+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
+.\" Digital Equipment Corporation
+.\"
+.\" Portions Copyright \(co 1990, 1991 by
+.\" Tektronix, Inc.
+.\"
+.\" Permission to use, copy, modify and distribute this documentation for
+.\" any purpose and without fee is hereby granted, provided that the above
+.\" copyright notice appears in all copies and that both that copyright notice
+.\" and this permission notice appear in all copies, and that the names of
+.\" Digital and Tektronix not be used in in advertising or publicity pertaining
+.\" to this documentation without specific, written prior permission.
+.\" Digital and Tektronix makes no representations about the suitability
+.\" of this documentation for any purpose.
+.\" It is provided ``as is'' without express or implied warranty.
+.\"
+.\" $XFree86: xc/doc/man/X11/XFlush.man,v 1.2 2001/01/27 18:19:59 dawes Exp $
+.\"
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xW Athena X Widgets \- C Language X Toolkit Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft 1
+.\".ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de FD
+.LP
+.KS
+.TA .5i 3i
+.ta .5i 3i
+.nf
+..
+.de FN
+.fi
+.KE
+.LP
+..
+.de IN \" send an index entry to the stderr
+..
+.de C{
+.KS
+.nf
+.D
+.\"
+.\" choose appropriate monospace font
+.\" the imagen conditional, 480,
+.\" may be changed to L if LB is too
+.\" heavy for your eyes...
+.\"
+.ie "\\*(.T"480" .ft L
+.el .ie "\\*(.T"300" .ft L
+.el .ie "\\*(.T"202" .ft PO
+.el .ie "\\*(.T"aps" .ft CW
+.el .ft R
+.ps \\n(PS
+.ie \\n(VS>40 .vs \\n(VSu
+.el .vs \\n(VSp
+..
+.de C}
+.DE
+.R
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de hN
+.ie t <\fB\\$1\fR>\\$2
+.el <\fI\\$1\fP>\\$2
+..
+.de NT
+.ne 7
+.ds NO Note
+.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
+.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
+.ie n .sp
+.el .sp 10p
+.TB
+.ce
+\\*(NO
+.ie n .sp
+.el .sp 5p
+.if '\\$1'C' .ce 99
+.if '\\$2'C' .ce 99
+.in +5n
+.ll -5n
+.R
+..
+. \" Note End -- doug kraft 3/85
+.de NE
+.ce 0
+.in -5n
+.ll +5n
+.ie n .sp
+.el .sp 10p
+..
+.ny0
+.TH XFlush __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
+.SH NAME
+XFlush, XSync, XEventsQueued, XPending \- handle output buffer or event queue
+.SH SYNTAX
+.HP
+int XFlush\^(\^Display *\fIdisplay\fP\^);
+.HP
+int XSync\^(\^Display *\fIdisplay\fP\^, Bool \fIdiscard\fP\^);
+.HP
+int XEventsQueued\^(\^Display *\fIdisplay\fP\^, int \fImode\fP\^);
+.HP
+int XPending\^(\^Display *\fIdisplay\fP\^);
+.SH ARGUMENTS
+.IP \fIdiscard\fP 1i
+Specifies a Boolean value that indicates whether
+.ZN XSync
+discards all events on the event queue.
+.IP \fIdisplay\fP 1i
+Specifies the connection to the X server.
+.IP \fImode\fP 1i
+Specifies the mode.
+You can pass
+.ZN QueuedAlready ,
+.ZN QueuedAfterFlush ,
+or
+.ZN QueuedAfterReading .
+.SH DESCRIPTION
+The
+.ZN XFlush
+function
+flushes the output buffer.
+Most client applications need not use this function because the output
+buffer is automatically flushed as needed by calls to
+.ZN XPending ,
+.ZN XNextEvent ,
+and
+.ZN XWindowEvent .
+.IN "XPending"
+.IN "XNextEvent"
+.IN "XWindowEvent"
+Events generated by the server may be enqueued into the library's event queue.
+.LP
+The
+.ZN XSync
+function
+flushes the output buffer and then waits until all requests have been received
+and processed by the X server.
+Any errors generated must be handled by the error handler.
+For each protocol error received by Xlib,
+.ZN XSync
+calls the client application's error handling routine (see section 11.8.2).
+Any events generated by the server are enqueued into the library's
+event queue.
+.LP
+Finally, if you passed
+.ZN False ,
+.ZN XSync
+does not discard the events in the queue.
+If you passed
+.ZN True ,
+.ZN XSync
+discards all events in the queue,
+including those events that were on the queue before
+.ZN XSync
+was called.
+Client applications seldom need to call
+.ZN XSync .
+.LP
+If mode is
+.ZN QueuedAlready ,
+.ZN XEventsQueued
+returns the number of events
+already in the event queue (and never performs a system call).
+If mode is
+.ZN QueuedAfterFlush ,
+.ZN XEventsQueued
+returns the number of events already in the queue if the number is nonzero.
+If there are no events in the queue,
+.ZN XEventsQueued
+flushes the output buffer,
+attempts to read more events out of the application's connection,
+and returns the number read.
+If mode is
+.ZN QueuedAfterReading ,
+.ZN XEventsQueued
+returns the number of events already in the queue if the number is nonzero.
+If there are no events in the queue,
+.ZN XEventsQueued
+attempts to read more events out of the application's connection
+without flushing the output buffer and returns the number read.
+.LP
+.ZN XEventsQueued
+always returns immediately without I/O if there are events already in the
+queue.
+.ZN XEventsQueued
+with mode
+.ZN QueuedAfterFlush
+is identical in behavior to
+.ZN XPending .
+.ZN XEventsQueued
+with mode
+.ZN QueuedAlready
+is identical to the
+.ZN XQLength
+function.
+.LP
+The
+.ZN XPending
+function returns the number of events that have been received from the
+X server but have not been removed from the event queue.
+.ZN XPending
+is identical to
+.ZN XEventsQueued
+with the mode
+.ZN QueuedAfterFlush
+specified.
+.SH "SEE ALSO"
+AllPlanes(3X11),
+XIfEvent(3X11),
+XNextEvent(3X11),
+XPutBackEvent(3X11)
+.br
+\fI\*(xL\fP