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3092
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1 /* Virtual diry bit implementation for XEmacs.
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2 Copyright (C) 2005 Marcus Crestani.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 #include "lisp.h"
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24
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25 #ifndef INCLUDED_vdb_h_
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26 #define INCLUDED_vdb_h_
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27
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28
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29 /*--- prototypes -------------------------------------------------------*/
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30
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31 BEGIN_C_DECLS
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32
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33 /* Platform dependent signal handling: */
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34
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35 /* Install the platform-dependent signal handler. */
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36 void vdb_install_signal_handler (void);
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37
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38 /* Platform dependent memory protection. */
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39 void vdb_protect (void *ptr, EMACS_INT len);
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40 void vdb_unprotect (void *ptr, EMACS_INT len);
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41
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42
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43
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44 /* Common (platform independent) virtual diry bit stuff: */
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45
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46 /* Start the write barrier. This function is called when a garbage
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47 collection is suspendend and the client is resumed. */
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48 void vdb_start_dirty_bits_recording (void);
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49 /* Stop the write barrier. This function is called when the client is
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50 suspendend and garbage collection is resumed. */
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51 void vdb_stop_dirty_bits_recording (void);
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52
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53 /* Record page faults: Add the object pointed to by addr to the write
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54 barrer's internal data structure that stores modified objects.
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55 This function is called by the write barrier's fault handler. */
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56 void vdb_designate_modified (void *addr);
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57
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58 /* Propagate page faults to garbage collector: Read out the write
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59 barrier's internal data structure that stores modified objects and
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60 pass the information to the garbage collector. This function is
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61 called by vdb_stop_dirty_bits_recording(). Return how many objects
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62 have to be re-examined by the garbage collector. */
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63 int vdb_read_dirty_bits (void);
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64
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65 /* Provides Lisp functions for testing vdb implementation. */
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66 void syms_of_vdb (void);
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67
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68 END_C_DECLS
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69
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70 #endif /* INCLUDED_vdb_h_ */
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