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SLEEP.PRG
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1992-10-17
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114 lines
/*
* File......: SLEEP.PRG
* Author....: Leo Letendre
* CIS ID....: 73607,233
* Date......: $Date: 17 Oct 1992 16:18:18 $
* Revision..: $Revision: 1.1 $
* Log file..: $Logfile: C:/nanfor/src/sleep.prv $
*
* This is an original work by Leo Letendre and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: C:/nanfor/src/sleep.prv $
*
* Rev 1.1 17 Oct 1992 16:18:18 GLENN
* Leo cleaned up the doc and file header.
*
* Rev 1.0 01 Jul 1992 02:19:12 GLENN
* Initial revision.
*
*/
#ifdef FT_TEST
* Test routine
* Invoke by running SLEEP 1.0 to sleep 1.0 seconds
*
FUNCTION MAIN(nSleep)
? "Time is now: " + time()
FT_SLEEP(VAL(nSleep))
? "Time is now: " + time()
RETURN ( nil )
#endif
/* $DOC$
* $FUNCNAME$
* FT_SLEEP
* $CATEGORY$
* Menus/Prompts
* $ONELINER$
* Wait for a specified amount of time
* $SYNTAX$
* FT_SLEEP( <nSeconds>, [<nInitial>] ) -> nil
* $ARGUMENTS$
* <nSeconds> is the number of seconds to pause
*
* <nInitial> is an optional clock value (from a call to SECONDS())
* from which the <nSeconds> seconds are to elapse. Useful
* for setting a minimum time between the start of events
* which could take a variable amount of time due to the
* execution of intervening code.
* $RETURNS$
* NIL
* $DESCRIPTION$
* This routine will wait a specified period of time. It provides
* resolution based upon the execution of the SECONDS() function.
* It does not use an input state such as INKEY(). The specified time
* is the minimum time sleeping and will usually be slightly longer.
*
* The second optional argument allows one to begin timing an event
* prior to executing some operation. This is useful when, for example,
* you input a key or mouse click and wish to do something but still want
* to note if the user double entered (mouse or key) within a certain time
* which in turn may have meaning within your program's context.
*
* The routine correctly handles passing through midnight but will not
* work for more than 24 hours.
* $EXAMPLES$
* Example 1:
* FT_SLEEP(10.0) && Sleep for 10.0 seconds
* Example 2:
* nTime=SECONDS() && usually after some interupt from mouse or
* && keyboard
*
* ... intervening code ...
*
* FT_SLEEP(0.5, nTime) && Sleep until the sytem clock is
* && nTime+0.5 seconds.
*
* $END$
*/
FUNCTION FT_SLEEP( nSeconds, nInitial )
IF nInitial == NIL .OR. VALTYPE( nInitial ) != "N"
nInitial := SECONDS()
ENDIF
// correct for running at midnight
IF nInitial + nSeconds > 86399
nInitial -= 86399
* Wait until midnight
DO WHILE SECONDS() > 100 // no problem with a _very_ slow machine
ENDDO
ENDIF
// calculate final time
nSeconds += ninitial
// Loop until we are done
DO WHILE ( SECONDS() < nSeconds )
ENDDO
RETURN NIL