71 lines
2.0 KiB
Scheme
71 lines
2.0 KiB
Scheme
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;; Copyright (C) Johan Ceuppens 2013
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;;
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 2 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; One chunk per memory allocation, can be used in meta-gc.scm API
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (make-gc)
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(let ((*heap '())
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(*null '())
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(*max-datasize 1024)
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(*datasize 0)
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(*dynamic-data '())
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)
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(define (malloc)
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(add-to-heap! 1)
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)
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(define (calloc nchunks)
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(add-to-heap! nchunks)
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)
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;; private procedures
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(define (get-heap) *heap)
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;; data is a string
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(define (get-data-size d) (string-length d))
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(define (generate-error msg)
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(cond ((eq? msg 'memory-exhausted)
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(display "memory exhausted")(newline))
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))
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(define (add-to-heap! n)
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(set! *heap (append (get-heap) (list (make-chunk)))))
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(define (make-chunk)
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(cons 'chunk *null))
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(define (set-data! chunk data)
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(set-cdr! chunk data))
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(define (set-chunk-data! chunk)
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(set! *datasize (+ *datasize (get-data-size chunk)))
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(if (> *datasize *max-datasize)
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(generate-error 'memory-exhausted)
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;; The data is dynamically bound in this actor
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(set-data! chunk *dynamic-data)
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))
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(define (dispatch msg)
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(cond ((eq? msg 'malloc) malloc)
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((eq? msg 'calloc) calloc)
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(else (display "make-gc : message not understood : ")(display msg)(newline))
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))
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dispatch))
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