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