lib_sleep_millisecs

	status.i4.v = lib_sleep_millisecs(milliseconds.i4.r)

	This routine puts the calling process to sleep for a specified number
	of milliseconds.  Note: the delay is implemented using $SETIMR to set
	an event flag and $WAITFR to wait for the event flag.  The event flag
	is allocated by using LIB$GET_EF (and released after the $WAITFR
	returns).  Due to other system activity and the clock granularity, the
	length of time that the process actually waits may be a bit longer
	than what was specified by the call argument.

	milliseconds	number of milliseconds to delay before continuing
			execution

	This function returns status values as follows:

	completion status values from the $SCHDWK system service

	This function requires the following include files:

	clib_h, ssdef_h

	Related functions:

	sleep_millisecs_c, lib_sleep_seconds, pause(_c)

	C/C++ usage:

	int	status;
	int	milliseconds = 500;

	status = lib_sleep_millisecs(&milliseconds);