XUnlockDisplay man page on Tru64

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XInitThreads(3X11)					    XInitThreads(3X11)

NAME
       XInitThreads, XLockDisplay, XUnlockDisplay - multi-threading support

SYNOPSIS
       Status XInitThreads();

       void XLockDisplay(display)
	       Display *display;

       void XUnlockDisplay(display)
	       Display *display;

ARGUMENTS
       Specifies the connection to the X server.

DESCRIPTION
       The  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  success‐
       ful;  otherwise,	 it  returns  zero.  On	 systems  that	do not support
       threads, this function always returns zero.

       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 initial‐
       ization is not required. It is recommended  that	 single-threaded  pro‐
       grams not call this function.

       The  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
       XLockDisplay work correctly; the display will not actually be  unlocked
       until XUnlockDisplay has been called the same number of times as XLock‐
       Display. This function has no effect unless Xlib was successfully  ini‐
       tialized for threads using XInitThreads.

       The  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 XLockDisplay has been
       called multiple times by a thread, then 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 XInitThreads.

SEE ALSO
       Xlib -- C Language X Interface

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