111 lines
4.5 KiB
Groff
111 lines
4.5 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\"
|
|
.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
|
|
.TH XInitThreads __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
|
|
.SH NAME
|
|
XInitThreads, XLockDisplay, XUnlockDisplay \- multi-threading support
|
|
.SH SYNTAX
|
|
.HP
|
|
Status XInitThreads\^(void);
|
|
.HP
|
|
void XLockDisplay\^(\^Display *\fIdisplay\fP\^);
|
|
.HP
|
|
void XUnlockDisplay\^(\^Display *\fIdisplay\fP\^);
|
|
.SH ARGUMENTS
|
|
.IP \fIdisplay\fP 1i
|
|
Specifies the connection to the X server.
|
|
.SH DESCRIPTION
|
|
The
|
|
.B XInitThreads
|
|
function initializes Xlib support for concurrent threads.
|
|
This function must be the first Xlib function a
|
|
multi-threaded program calls, and it must complete
|
|
before any other Xlib call is made.
|
|
This function returns a nonzero status if initialization was
|
|
successful; otherwise, it returns zero.
|
|
On systems that do not support threads, this function always returns zero.
|
|
.LP
|
|
It is only necessary to call this function if multiple threads
|
|
might use Xlib concurrently.
|
|
If all calls to Xlib functions
|
|
are protected by some other access mechanism (for example,
|
|
a mutual exclusion lock in a toolkit or through explicit client
|
|
programming), Xlib thread initialization is not required.
|
|
It is recommended that single-threaded programs not call this function.
|
|
|
|
.LP
|
|
The
|
|
.B XLockDisplay
|
|
function locks out all other threads from using the specified display.
|
|
Other threads attempting to use the display will block until
|
|
the display is unlocked by this thread.
|
|
Nested calls to
|
|
.B XLockDisplay
|
|
work correctly; the display will not actually be unlocked until
|
|
.B XUnlockDisplay
|
|
has been called the same number of times as
|
|
.BR XLockDisplay .
|
|
This function has no effect unless Xlib was successfully initialized
|
|
for threads using
|
|
.BR XInitThreads .
|
|
.LP
|
|
The
|
|
.B XUnlockDisplay
|
|
function allows other threads to use the specified display again.
|
|
Any threads that have blocked on the display are allowed to continue.
|
|
Nested locking works correctly; if
|
|
.B XLockDisplay
|
|
has been called multiple times by a thread, then
|
|
.B XUnlockDisplay
|
|
must be called an equal number of times before the display is
|
|
actually unlocked.
|
|
This function has no effect unless Xlib was successfully initialized
|
|
for threads using
|
|
.BR XInitThreads .
|
|
.SH "SEE ALSO"
|
|
\fI\*(xL\fP
|