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XInitThreads(3X11) XLIB FUNCTIONS XInitThreads(3X11)
NAME
XInitThreads, XLockDisplay, XUnlockDisplay - multi-threading support
SYNTAX
Status XInitThreads(void);
void XLockDisplay(Display *display);
void XUnlockDisplay(Display *display);
ARGUMENTS
display 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
successful; 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
X Version 11 libX11 1.0.3 XInitThreads(3X11)
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This page was generated on Sat Sep 8 16:36:14 GMT 2007
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