$include (..\lib\compStch.ext)

/*
 *============================================================================
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
 *
 *  Permission to use for any purpose, modify, copy, and make enhancements
 *  and derivative works of the software is granted if attribution is given to
 *  R.M. Gillmore, dba the ACME Software Deli, as the author
 *
 *  While the ACME Software Deli does not work for money, there is nonetheless
 *  a significant amount of work involved.  The ACME Software Deli maintains the
 *  rights to all code written, though it may be used and distributed as long as
 *  the following conditions are maintained.
 *
 *  1.  The copyright statement at the top of each code block is maintained in
 *      your distribution.
 *  2.  You do not identify yourself as the ACME Software Deli
 *  3.  Any changes made to the software are sent to the ACME Software Deli
 *============================================================================
 */

clockTickModule:
do;
$if not noID
declare IDString	(*) byte data
	( '@(#)clkTick.p86   $Author: rmgillmore $ $Date:: 2025-05-04 19:35:39#$:', 0 );
$endif

$include (..\lib\comnDefs.ext)
$set (clockTickSource)
$include (..\lib\date.ext)
$include (..\lib\sysCalls.ext)

waitForTicks:
procedure	( numberTicks ) public;
	declare	numberTicks		word;

	declare	CLOCK			literally	'01ah';

	declare	cpuRegisters,
			waitForThisOne	dword,
			currentTick		dword,
			( lowerTick, upperTick )	word at ( @currentTick );

	/*
	 *	get the current clock tick
	 */

	byteRegs.Ah = 0;
	call int86( CLOCK, @wordRegs );
	lowerTick = wordRegs.Dx;
	upperTick = wordRegs.Cx;

	/*
	 *	determine the clock tick value for which we will wait
	 */

	waitForThisOne = currentTick + double( numberTicks );

	do while ( currentTick < waitForThisOne );
		/*
		 *	get the clock tick
		 */

		byteRegs.Ah = 0;
		call int86( CLOCK, @wordRegs );
		lowerTick = wordRegs.Dx;
		upperTick = wordRegs.Cx;
	end;	/*	while we have not found the clock tick */

end waitForTicks;

end clockTickModule;