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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.
34 lines
1,016 B
Scheme
34 lines
1,016 B
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: cpstak.sch
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; Description: continuation-passing version of TAK
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; Author: Will Clinger
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; Created: 20-Aug-87
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; Language: Scheme
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; Status: Public Domain
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; CPSTAK -- A continuation-passing version of the TAK benchmark.
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;;; A good test of first class procedures and tail recursion.
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(define (cpstak x y z)
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(define (tak x y z k)
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(if (not (< y x))
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(k z)
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(tak (- x 1)
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y
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z
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(lambda (v1)
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(tak (- y 1)
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z
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x
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(lambda (v2)
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(tak (- z 1)
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x
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y
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(lambda (v3)
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(tak v1 v2 v3 k)))))))))
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(tak x y z (lambda (a) a)))
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;;; call: (cpstak 18 12 6)
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(time (cpstak 18 12 2))
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