MySQL 5.1: mysql/src/5.1-dbg/sql/sql_map.h Source File
mysql/src/5.1-dbg/sql/sql_map.h

00001 /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; either version 2 of the License, or
00006    (at your option) any later version.
00007 
00008    This program is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011    GNU General Public License for more details.
00012 
00013    You should have received a copy of the GNU General Public License
00014    along with this program; if not, write to the Free Software
00015    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
00016 
00017 
00018 /* interface for memory mapped files */
00019 
00020 #ifdef USE_PRAGMA_INTERFACE 
00021 #pragma interface                       /* gcc class implementation */
00022 #endif
00023 
00024 class mapped_files;
00025 mapped_files *map_file(const my_string name,byte *magic,uint magic_length);
00026 void unmap_file(mapped_files *map);
00027 
00028 class mapped_files :public ilink {
00029   byte *map;
00030   ha_rows size;
00031   char *name;                                   // name of mapped file
00032   File file;                                    // >= 0 if open
00033   int  error;                                   // If not mapped
00034   uint use_count;
00035 
00036 public:
00037   mapped_files(const my_string name,byte *magic,uint magic_length);
00038   ~mapped_files();
00039 
00040   friend class mapped_file;
00041   friend mapped_files *map_file(const my_string name,byte *magic,
00042                                 uint magic_length);
00043   friend void unmap_file(mapped_files *map);
00044 };
00045 
00046 
00047 class mapped_file
00048 {
00049   mapped_files *file;
00050 public:
00051   mapped_file(const my_string name,byte *magic,uint magic_length)
00052   {
00053     file=map_file(name,magic,magic_length);     /* old or new map */
00054   }
00055   ~mapped_file()
00056   {
00057     unmap_file(file);                           /* free map */
00058   }
00059   byte *map()
00060   {
00061     return file->map;
00062   }
00063 };
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