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73 lines
2.4 KiB
73 lines
2.4 KiB
15 years ago
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#ifndef LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_
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#define LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_
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/* This file is part of indexlib.
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* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
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*
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* Indexlib is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation and available as file
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* GPL_V2 which is distributed along with indexlib.
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*
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* Indexlib is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of this program with any edition of
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* the Qt library by Trolltech AS, Norway (or with modified versions
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* of Qt that use the same license as Qt), and distribute linked
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* combinations including the two. You must obey the GNU General
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* Public License in all respects for all of the code used other than
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* Qt. If you modify this file, you may extend this exception to
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* your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from
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* your version.
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*/
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#include "manager.h"
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#include <string>
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#include <cstring>
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#include <unistd.h>
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#include <assert.h>
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class mmap_manager : public memory_manager {
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public:
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explicit mmap_manager( std::string );
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~mmap_manager();
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const unsigned char* ronly_base( unsigned offset ) const {
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assert( offset <= size() ); // allow 1-past-the-end but not more
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return reinterpret_cast<unsigned char*>( base_ ) + offset;
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}
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unsigned char* rw_base( unsigned offset ) const {
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assert( offset <= size() ); // as above
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return reinterpret_cast<unsigned char*>( base_ ) + offset;
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}
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unsigned size() const {
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return size_;
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}
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void resize( unsigned );
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static void remove( std::string fname ) {
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::unlink( fname.c_str() );
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}
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private:
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void unmap();
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void map( unsigned );
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std::string filename_;
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const unsigned pagesize_;
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int fd_;
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void* base_;
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unsigned size_;
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};
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#endif /* LPC_MMAP_MANAGER_H1103129409_INCLUDE_GUARD_ */
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