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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.
46 lines
1.4 KiB
Text
Executable file
46 lines
1.4 KiB
Text
Executable file
#! /usr/bin/env chibi-scheme
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;;; The Computer Language Benchmarks Game
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;;; http://shootout.alioth.debian.org/
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(import (chibi) (srfi 9))
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(define-record-type node
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(make-node value left right)
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node?
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(value node-value node-value-set!)
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(left node-left node-left-set!)
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(right node-right node-right-set!))
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(define (make value depth)
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(if (zero? depth)
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(make-node value #f #f)
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(let ((v (* value 2))
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(d (- depth 1)))
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(make-node value (make (- v 1) d) (make v d)))))
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(define (check n)
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(if n
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(+ (node-value n) (- (check (node-left n)) (check (node-right n))))
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0))
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(define (print . args) (for-each display args) (newline))
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(let* ((args (command-line))
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(n (string->number (cadr args)))
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(min-depth 4)
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(max-depth (max (+ min-depth 2) n))
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(stretch-depth (+ max-depth 1)))
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(print "stretch tree of depth " stretch-depth "\t check: "
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(check (make 0 stretch-depth)))
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(let ((long-lived-tree (make 0 max-depth)))
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(do ((d min-depth (+ d 2)))
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((>= d max-depth))
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(let ((iterations (* 2 (+ (- max-depth d) min-depth))))
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(print (* 2 iterations) "\t trees of depth " d "\t check: "
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(do ((i 0 (+ i 1))
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(c 0 (+ c (check (make i d)) (check (make (- i) d)))))
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((>= i iterations)
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c)))))
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(print "long lived tree of depth " max-depth "\t check: "
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(check long-lived-tree))))
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