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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.
43 lines
1.1 KiB
Scheme
43 lines
1.1 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: takl.sch
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; Description: TAKL benchmark from the Gabriel tests
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; Author: Richard Gabriel
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; Created: 12-Apr-85
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; Modified: 12-Apr-85 10:07:00 (Bob Shaw)
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; 22-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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;;; TAKL -- The TAKeuchi function using lists as counters.
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(define (listn n)
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(if (not (= 0 n))
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(cons n (listn (- n 1)))
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'()))
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(define l18l (listn 18))
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(define l12l (listn 12))
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(define l6l (listn 2))
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(define (mas x y z)
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(if (not (shorterp y x))
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z
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(mas (mas (cdr x)
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y z)
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(mas (cdr y)
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z x)
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(mas (cdr z)
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x y))))
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(define (shorterp x y)
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(and (not (null? y))
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(or (null? x)
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(shorterp (cdr x)
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(cdr y)))))
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;;; call: (mas 18l 12l 6l)
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(let ((v (if (with-input-from-file "input.txt" read) l6l '())))
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(time (mas l18l l12l v)))
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