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64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// mmap.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace mongo {
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class MemoryMappedFile {
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public:
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MemoryMappedFile();
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~MemoryMappedFile(); /* closes the file if open */
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void close();
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// Throws exception if file doesn't exist.
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void* map( const char *filename );
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/* Creates with length if DNE, otherwise uses existing file length,
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passed length.
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*/
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void* map(const char *filename, long &length);
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void flush(bool sync);
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void* viewOfs() {
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return view;
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}
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long length() {
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return len;
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}
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static void updateLength( const char *filename, long &length );
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static long long totalMappedLength();
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static void closeAllFiles( stringstream &message );
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private:
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void created();
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HANDLE fd;
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HANDLE maphandle;
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void *view;
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long len;
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};
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} // namespace mongo
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