237 lines
5.0 KiB
Plaintext
237 lines
5.0 KiB
Plaintext
.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ny0
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.TH XFlush 3X11 "Release 5" "X Version 11" "XLIB FUNCTIONS"
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.SH NAME
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XFlush, XSync, XEventsQueued, XPending \- handle output buffer or event queue
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.SH SYNTAX
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.\" $Header: XFlush.f,v 1.1 88/02/26 10:00:10 mento Exp $
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XFlush\^(\^\fIdisplay\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.LP
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.\" $Header: XSync.f,v 1.2 88/04/07 12:52:07 mento Exp $
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XSync\^(\^\fIdisplay\fP, \fIdiscard\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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Bool \fIdiscard\fP\^;
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.LP
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int XEventsQueued\^(\^\fIdisplay\fP, \fImode\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.br
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int \fImode\fP\^;
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.LP
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.\" $Header: XPending.f,v 1.1 88/02/26 10:01:44 mento Exp $
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int XPending\^(\^\fIdisplay\fP\^)
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.br
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Display *\fIdisplay\fP\^;
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.SH ARGUMENTS
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.\" $Header: discard.a,v 1.3 88/05/14 13:09:22 mento Exp $
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.IP \fIdiscard\fP 1i
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Specifies a Boolean value that indicates whether
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.ZN XSync
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discards all events on the event queue.
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.\" $Header: display.a,v 1.1 88/02/26 10:26:29 mento Exp $
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fImode\fP 1i
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Specifies the mode.
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You can pass
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.ZN QueuedAlready ,
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.ZN QueuedAfterFlush ,
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or
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.ZN QueuedAfterReading .
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.SH DESCRIPTION
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.\" $Header: XFlush.d,v 1.2 88/06/11 07:50:19 mento Exp $
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The
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.ZN XFlush
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function
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flushes the output buffer.
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Most client applications need not use this function because the output
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buffer is automatically flushed as needed by calls to
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.ZN XPending ,
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.ZN XNextEvent ,
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and
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.ZN XWindowEvent .
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.IN "XPending"
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.IN "XNextEvent"
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.IN "XWindowEvent"
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Events generated by the server may be enqueued into the library's event queue.
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.LP
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.\" $Header: XSync.d,v 1.2 88/06/11 07:53:53 mento Exp $
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The
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.ZN XSync
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function
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flushes the output buffer and then waits until all requests have been received
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and processed by the X server.
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Any errors generated must be handled by the error handler.
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For each protocol error received by Xlib,
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.ZN XSync
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calls the client application's error handling routine (see section 11.8.2).
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Any events generated by the server are enqueued into the library's
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event queue.
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.LP
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Finally, if you passed
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.ZN False ,
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.ZN XSync
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does not discard the events in the queue.
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If you passed
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.ZN True ,
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.ZN XSync
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discards all events in the queue,
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including those events that were on the queue before
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.ZN XSync
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was called.
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Client applications seldom need to call
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.ZN XSync .
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.LP
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If mode is
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.ZN QueuedAlready ,
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.ZN XEventsQueued
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returns the number of events
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already in the event queue (and never performs a system call).
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If mode is
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.ZN QueuedAfterFlush ,
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.ZN XEventsQueued
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returns the number of events already in the queue if the number is nonzero.
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If there are no events in the queue,
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.ZN XEventsQueued
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flushes the output buffer,
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attempts to read more events out of the application's connection,
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and returns the number read.
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If mode is
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.ZN QueuedAfterReading ,
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.ZN XEventsQueued
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returns the number of events already in the queue if the number is nonzero.
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If there are no events in the queue,
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.ZN XEventsQueued
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attempts to read more events out of the application's connection
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without flushing the output buffer and returns the number read.
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.LP
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.ZN XEventsQueued
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always returns immediately without I/O if there are events already in the
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queue.
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.ZN XEventsQueued
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with mode
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.ZN QueuedAfterFlush
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is identical in behavior to
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.ZN XPending .
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.ZN XEventsQueued
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with mode
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.ZN QueuedAlready
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is identical to the
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.ZN XQLength
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function.
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.LP
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.\" $Header: XPending.d,v 1.2 88/06/11 07:52:06 mento Exp $
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The
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.ZN XPending
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function returns the number of events that have been received from the
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X server but have not been removed from the event queue.
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.ZN XPending
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is identical to
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.ZN XEventsQueued
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with the mode
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.ZN QueuedAfterFlush
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specified.
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.SH "SEE ALSO"
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AllPlanes(3X11),
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XIfEvent(3X11),
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XNextEvent(3X11),
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XPutBackEvent(3X11)
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.br
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\fI\*(xL\fP
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