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886
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1 ;;; post-gc.el --- post-gc actions
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2
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3 ;; Copyright (C) 1985-1986, 1990, 1992-1997 Free Software Foundation, Inc.
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4 ;; Copyright (c) 1993, 1994 Sun Microsystems, Inc.
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5 ;; Copyright (C) 1995 Board of Trustees, University of Illinois
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6
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7 ;; Author: Mike Sperber <mike@xemacs.org>
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8 ;; Maintainer: XEmacs Development Team
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9 ;; Keywords: internal, dumped
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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25 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Synched up with: Not in FSF.
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29
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30 ;;; Commentary:
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31
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32 ;; This file is dumped with XEmacs.
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33
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34 ;; This file defines actions to happen after each GC to perform
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35 ;; additional cleanup, call finalizers, etc.
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36
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37 (defun run-finalizers (alist)
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38 "Run the finalizers for all objects that have just become unreachable."
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39 (let ((info (assq 'finalize-list alist)))
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40 (if info
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41 (let ((finalize-list (cdr info)))
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42 (while finalize-list
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43 (funcall (cdr (car finalize-list)) (car (car finalize-list)))
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44 (setq finalize-list (cdr finalize-list)))))))
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45
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46 (add-hook 'post-gc-hook 'run-finalizers)
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47
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1591
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48 (defvar simple-finalizer-ephemerons '()
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49 "List of ephemerons for objects that have a finalizer attached..")
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886
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50
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1591
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51 (defun add-finalizer (object func)
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52 "Add FUNC as a finalizer for object OBJECT."
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53 (setq simple-finalizer-ephemerons
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54 (cons (make-ephemeron object object func)
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55 simple-finalizer-ephemerons)))
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56
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57 (defun cleanup-simple-finalizers (alist)
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58 "Clean up `simple-finalizer-ephemerons'."
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59 ;; We have to do this by hand because DELETE-IF isn't defined yet.
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60 (let ((current simple-finalizer-ephemerons)
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61 (prev nil))
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62 (while (not (null current))
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63 (if (not (ephemeron-ref (car current)))
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64 (if (null prev)
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65 (setq simple-finalizer-ephemerons (cdr current))
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66 (setcdr prev (cdr current)))
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67 (setq prev current))
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68 (setq current (cdr current)))))
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69
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70 (add-hook 'post-gc-hook 'cleanup-simple-finalizers)
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