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;;;
;;; Copyright (C) 2007 Lothar May l-may@gmx.de
;;;
;;; All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or
;;; without modification, are permitted provided that the
;;; following conditions are met:
;;; 1. Redistributions of source code must retain the above
;;; copyright notice, this list of conditions and the
;;; following disclaimer.
;;; 2. Redistributions in binary form must reproduce the
;;; above copyright notice, this list of conditions and
;;; the following disclaimer in the documentation and/or
;;; other materials provided with the distribution.
;;; 3. Neither the name of the project nor the names of
;;; its contributors may be used to endorse or promote
;;; products derived from this software without specific
;;; prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS
;;; ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
;;; BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
;;; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;;; DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
;;; BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
;;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
;;; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
;;; IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
;;; USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
;;; OF SUCH DAMAGE.
;;;
;;; Software timer
;;;
(define timer-create
(lambda (timeout-msec)
(cons timeout-msec 0)))
(define timer-gettimeout
(lambda (timer)
(car timer)))
(define timer-getcurtime
(lambda ()
(let ((time (gettimeofday)))
(+ (* (car time) 1000) (quotient (cdr time) 1000)))))
(define timer-start
(lambda (timer)
(cons (timer-gettimeout timer) (timer-getcurtime))))
(define timer-expired?
(lambda (timer)
(>= (timer-getcurtime) (+ (car timer) (cdr timer)))))
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