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Tcl_CreateTimerHandler(3)	      Tcl Library Procedures		Tcl_CreateTimerHandler(3)


       Tcl_CreateTimerHandler, Tcl_DeleteTimerHandler - call a procedure at a given time

       #include <tcl.h>

       Tcl_CreateTimerHandler(milliseconds, proc, clientData)


       int milliseconds (in)			 How  many  milliseconds  to wait before invoking

       Tcl_TimerProc *proc (in) 		 Procedure  to	invoke	after  milliseconds  have

       ClientData clientData (in)		 Arbitrary one-word value to pass to proc.

       Tcl_TimerToken token (in)		 Token	for previously created timer handler (the
						 return value from some previous call to Tcl_Cre-

       Tcl_CreateTimerHandler arranges for proc to be invoked at a time milliseconds milliseconds
       in the future.  The callback to proc will be made by Tcl_DoOneEvent,  so  Tcl_CreateTimer-
       Handler	is only useful in programs that dispatch events through Tcl_DoOneEvent or through
       Tcl commands such as vwait.  The call to proc may not be made at the exact time	given  by
       milliseconds:   it  will be made at the next opportunity after that time.  For example, if
       Tcl_DoOneEvent is not called until long after the time has elapsed, or if there are  other
       pending events to process before the call to proc, then the call to proc will be delayed.

       Proc should have arguments and return value that match the type Tcl_TimerProc:
	      typedef void Tcl_TimerProc(ClientData clientData);
       The clientData parameter to proc is a copy of the clientData argument given to Tcl_Create-
       TimerHandler when the callback was created.  Typically, clientData points to a data struc-
       ture containing application-specific information about what to do in proc.

       Tcl_DeleteTimerHandler  may  be	called	to delete a previously created timer handler.  It
       deletes the handler indicated by token so that no call to proc will be made;  if that han-
       dler  no longer exists (e.g. because the time period has already elapsed and proc has been
       invoked then Tcl_DeleteTimerHandler does nothing.  The tokens returned by Tcl_CreateTimer-
       Handler	never  have  a value of NULL, so if NULL is passed to Tcl_DeleteTimerHandler then
       the procedure does nothing.

       callback, clock, handler, timer

Tcl					       7.5			Tcl_CreateTimerHandler(3)
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