--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/vdb.h	Fri Nov 25 01:42:08 2005 +0000
@@ -0,0 +1,70 @@
+/* Virtual diry bit implementation for XEmacs.
+   Copyright (C) 2005 Marcus Crestani.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Not in FSF. */
+
+#include "lisp.h"
+
+#ifndef INCLUDED_vdb_h_
+#define INCLUDED_vdb_h_
+
+
+/*--- prototypes -------------------------------------------------------*/
+
+BEGIN_C_DECLS
+
+/* Platform dependent signal handling: */
+
+/* Install the platform-dependent signal handler. */
+void vdb_install_signal_handler (void);
+
+/* Platform dependent memory protection. */
+void vdb_protect (void *ptr, EMACS_INT len);
+void vdb_unprotect (void *ptr, EMACS_INT len);
+
+
+
+/* Common (platform independent) virtual diry bit stuff: */
+
+/* Start the write barrier.  This function is called when a garbage
+   collection is suspendend and the client is resumed. */
+void vdb_start_dirty_bits_recording (void);
+/* Stop the write barrier.  This function is called when the client is
+   suspendend and garbage collection is resumed. */
+void vdb_stop_dirty_bits_recording (void);
+
+/* Record page faults: Add the object pointed to by addr to the write
+   barrer's internal data structure that stores modified objects.
+   This function is called by the write barrier's fault handler. */
+void vdb_designate_modified (void *addr);
+
+/* Propagate page faults to garbage collector: Read out the write
+   barrier's internal data structure that stores modified objects and
+   pass the information to the garbage collector.  This function is
+   called by vdb_stop_dirty_bits_recording().  Return how many objects
+   have to be re-examined by the garbage collector. */
+int vdb_read_dirty_bits (void);
+
+/* Provides Lisp functions for testing vdb implementation. */
+void syms_of_vdb (void);
+
+END_C_DECLS
+
+#endif /* INCLUDED_vdb_h_ */