2006-11-25 09:33:55 -07:00
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided ``as is'' without express or implied warranty.
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.\"
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.\"
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.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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2013-04-28 10:55:55 -06:00
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.ft CW
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2006-11-25 09:33:55 -07:00
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.\".ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de IN \" send an index entry to the stderr
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..
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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..
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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.de hN
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..
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.ny0
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.TH XInitThreads __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XInitThreads, XLockDisplay, XUnlockDisplay \- multi-threading support
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.SH SYNTAX
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.HP
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Status XInitThreads\^(void);
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.HP
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void XLockDisplay\^(\^Display *\fIdisplay\fP\^);
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.HP
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void XUnlockDisplay\^(\^Display *\fIdisplay\fP\^);
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.SH ARGUMENTS
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.SH DESCRIPTION
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The
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.ZN XInitThreads
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function initializes Xlib support for concurrent threads.
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This function must be the first Xlib function a
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multi-threaded program calls, and it must complete
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before any other Xlib call is made.
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This function returns a nonzero status if initialization was
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successful; otherwise, it returns zero.
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On systems that do not support threads, this function always returns zero.
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.LP
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It is only necessary to call this function if multiple threads
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might use Xlib concurrently. If all calls to Xlib functions
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are protected by some other access mechanism (for example,
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a mutual exclusion lock in a toolkit or through explicit client
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programming), Xlib thread initialization is not required.
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It is recommended that single-threaded programs not call this function.
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.LP
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The
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.ZN XLockDisplay
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function locks out all other threads from using the specified display.
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Other threads attempting to use the display will block until
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the display is unlocked by this thread.
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Nested calls to
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.ZN XLockDisplay
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work correctly; the display will not actually be unlocked until
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.ZN XUnlockDisplay
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has been called the same number of times as
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.ZN XLockDisplay .
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This function has no effect unless Xlib was successfully initialized
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for threads using
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.ZN XInitThreads .
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.LP
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The
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.ZN XUnlockDisplay
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function allows other threads to use the specified display again.
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Any threads that have blocked on the display are allowed to continue.
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Nested locking works correctly; if
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.ZN XLockDisplay
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has been called multiple times by a thread, then
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.ZN XUnlockDisplay
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must be called an equal number of times before the display is
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actually unlocked.
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This function has no effect unless Xlib was successfully initialized
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for threads using
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.ZN XInitThreads .
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.SH "SEE ALSO"
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\fI\*(xL\fP
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