Import changeset

sql/sql_map.h

@@ -0,0 +1,59 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This program 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 of the License, or
+   (at your option) any later version.
+   
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+
+/* interface for memory mapped files */
+
+#ifdef __GNUC__
+#pragma interface			/* gcc class implementation */
+#endif
+
+class mapped_files :public ilink {
+  byte *map;
+  ha_rows size;
+  char *name;					// name of mapped file
+  File file;					// >= 0 if open
+  int  error;					// If not mapped
+  uint use_count;
+
+public:
+  mapped_files(const my_string name,byte *magic,uint magic_length);
+  ~mapped_files();
+
+  friend class mapped_file;
+  friend mapped_files *map_file(const my_string name,byte *magic,
+				uint magic_length);
+  friend void unmap_file(mapped_files *map);
+};
+
+
+class mapped_file
+{
+  mapped_files *file;
+public:
+  mapped_file(const my_string name,byte *magic,uint magic_length)
+  {
+    file=map_file(name,magic,magic_length);	/* old or new map */
+  }
+  ~mapped_file()
+  {
+    unmap_file(file);				/* free map */
+  }
+  byte *map()
+  {
+    return file->map;
+  }
+};