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XSynchronize, XSetAfterFunction
- enable or disable synchronization  
- int (*XSynchronize(Display *display,
Bool onoff))();  
- int (*XSetAfterFunction(Display *display, int 
- (*procedure)()))();
 
Specifies the connection to the X server. 
Specifies the procedure
to be called. 
Specifies a Boolean value that indicates whether to enable
 or disable synchronization. 
The XSynchronize   function returns
 the previous after function. If onoff is  True,   XSynchronize   turns
on synchronous behavior. If onoff is False,   XSynchronize   turns off synchronous
behavior. 
The specified procedure is called with only a display pointer.
XSetAfterFunction   returns the previous after function. 
XSetErrorHandler(3X11)
Xlib - C Language X Interface 
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