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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.
57 lines
1.5 KiB
Scheme
57 lines
1.5 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: div.sch
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; Description: DIV benchmarks
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; Author: Richard Gabriel
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; Created: 8-Apr-85
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; Modified: 19-Jul-85 18:28:01 (Bob Shaw)
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; 23-Jul-87 (Will Clinger)
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; Language: Scheme
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; Status: Public Domain
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; DIV2 -- Benchmark which divides by 2 using lists of n ()'s.
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;;; This file contains a recursive as well as an iterative test.
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(define (create-n n)
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(do ((n n (- n 1))
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(a '() (cons '() a)))
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((= n 0) a)))
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(define *ll* (create-n 200))
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(define (iterative-div2 l)
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(do ((l l (cddr l))
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(a '() (cons (car l) a)))
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((null? l) a)))
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(define (recursive-div2 l)
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(cond ((null? l) '())
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(else (cons (car l) (recursive-div2 (cddr l))))))
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(define (test-1 l)
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(do ((i 3000 (- i 1)))
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((= i 0))
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(iterative-div2 l)
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(iterative-div2 l)
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(iterative-div2 l)
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(iterative-div2 l)))
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(define (test-2 l)
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(do ((i 3000 (- i 1)))
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((= i 0))
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(recursive-div2 l)
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(recursive-div2 l)
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(recursive-div2 l)
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(recursive-div2 l)))
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;;; for the iterative test call: (test-1 *ll*)
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;;; for the recursive test call: (test-2 *ll*)
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(let ((input (with-input-from-file "input.txt" read)))
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(time (let loop ((n 10) (v 0))
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(if (zero? n)
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v
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(loop (- n 1)
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(cons
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(test-1 (if input *ll* '()))
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(test-2 (if input *ll* '()))))))))
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