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69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
// mmap.h
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/* Copyright 2009 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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enum Options {
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SEQUENTIAL = 1
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};
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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, int options = 0 );
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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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static int flushAll( bool sync );
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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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void printMemInfo( const char * where );
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} // namespace mongo
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