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// mmap.h
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace mongo {
class MemoryMappedFile {
public:
MemoryMappedFile();
~MemoryMappedFile(); /* closes the file if open */
void close();
// Throws exception if file doesn't exist.
void* map( const char *filename );
/* Creates with length if DNE, otherwise uses existing file length,
passed length.
*/
void* map(const char *filename, long &length);
void flush(bool sync);
void* viewOfs() {
return view;
}
long length() {
return len;
}
static void updateLength( const char *filename, long &length );
static long long totalMappedLength();
static void closeAllFiles( stringstream &message );
static int flushAll( bool sync );
private:
void created();
HANDLE fd;
HANDLE maphandle;
void *view;
long len;
};
} // namespace mongo
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