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#ifndef LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_
#define LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_
/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
*
* Indexlib is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation and available as file
* GPL_V2 which is distributed along with indexlib.
*
* Indexlib 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of this program with any edition of
* the Qt library by Trolltech AS, Norway (or with modified versions
* of Qt that use the same license as Qt), and distribute linked
* combinations including the two. You must obey the GNU General
* Public License in all respects for all of the code used other than
* Qt. If you modify this file, you may extend this exception to
* your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from
* your version.
*/
#include "manager.h"
#include <string>
#include <cstring>
#include <unistd.h>
#include <assert.h>
class mmap_manager : public memory_manager {
public:
explicit mmap_manager( std::string );
~mmap_manager();
const unsigned char* ronly_base( unsigned offset ) const {
assert( offset <= size() ); // allow 1-past-the-end but not more
return reinterpret_cast<unsigned char*>( base_ ) + offset;
}
unsigned char* rw_base( unsigned offset ) const {
assert( offset <= size() ); // as above
return reinterpret_cast<unsigned char*>( base_ ) + offset;
}
unsigned size() const {
return size_;
}
void resize( unsigned );
static void remove( std::string fname ) {
::unlink( fname.c_str() );
}
private:
void unmap();
void map( unsigned );
std::string filename_;
const unsigned pagesize_;
int fd_;
void* base_;
unsigned size_;
};
#endif /* LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_ */
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