import from X.Org 7.2RC2

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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
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+.\" 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
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+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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+.\" Except as contained in this notice, the name of the X Consortium shall
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+.\"
+.\" 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
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+.\" to this documentation without specific, written prior permission.
+.\" Digital and Tektronix makes no representations about the suitability
+.\" of this documentation for any purpose.
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+.\" 
+.\" $XFree86: xc/doc/man/X11/XThreads.man,v 1.2 2001/01/27 18:20:06 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
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+.de FN
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+.LP
+..
+.de IN		\" send an index entry to the stderr
+..
+.de C{
+.KS
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+.D
+.\"
+.\"	choose appropriate monospace font
+.\"	the imagen conditional, 480,
+.\"	may be changed to L if LB is too
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+.		\" Note End -- doug kraft 3/85
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+.ny0
+.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
+.ZN 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
+.ZN 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
+.ZN XLockDisplay
+work correctly; the display will not actually be unlocked until
+.ZN XUnlockDisplay
+has been called the same number of times as
+.ZN XLockDisplay .
+This function has no effect unless Xlib was successfully initialized
+for threads using
+.ZN XInitThreads .
+.LP
+The
+.ZN 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
+.ZN XLockDisplay
+has been called multiple times by a thread, then
+.ZN 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
+.ZN XInitThreads .
+.SH "SEE ALSO"
+\fI\*(xL\fP