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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
59 lines
1.7 KiB
Scheme
59 lines
1.7 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: deriv.sch
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; Description: The DERIV benchmark from the Gabriel tests.
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; Author: Vaughan Pratt
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; Created: 8-Apr-85
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; Modified: 10-Apr-85 14:53:50 (Bob Shaw)
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; 23-Jul-87 (Will Clinger)
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; 9-Feb-88 (Will Clinger)
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; Language: Scheme
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; Status: Public Domain
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; DERIV -- Symbolic derivative benchmark written by Vaughn Pratt.
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;;; It uses a simple subset of Lisp and does a lot of CONSing.
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; Returns the wrong answer for quotients.
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; Fortunately these aren't used in the benchmark.
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(define (deriv-aux a) (list '/ (deriv a) a))
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(define (deriv a)
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(cond
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((not (pair? a))
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(cond ((eq? a 'x) 1) (else 0)))
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((eq? (car a) '+)
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(cons '+ (map deriv (cdr a))))
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((eq? (car a) '-)
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(cons '- (map deriv
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(cdr a))))
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((eq? (car a) '*)
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(list '*
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a
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(cons '+ (map deriv-aux (cdr a)))))
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((eq? (car a) '/)
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(list '-
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(list '/
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(deriv (cadr a))
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(caddr a))
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(list '/
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(cadr a)
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(list '*
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(caddr a)
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(caddr a)
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(deriv (caddr a))))))
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(else 'error)))
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(define (run)
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(do ((i 0 (+ i 1)))
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((= i 50000))
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(deriv '(+ (* 3 x x) (* a x x) (* b x) 5))
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(deriv '(+ (* 3 x x) (* a x x) (* b x) 5))
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(deriv '(+ (* 3 x x) (* a x x) (* b x) 5))
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(deriv '(+ (* 3 x x) (* a x x) (* b x) 5))
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(deriv '(+ (* 3 x x) (* a x x) (* b x) 5))))
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;;; call: (run)
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(time (run))
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