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// mmap.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "mmap.h"
namespace mongo {
set<MemoryMappedFile*> mmfiles;
MemoryMappedFile::~MemoryMappedFile() {
close();
mmfiles.erase(this);
}
void MemoryMappedFile::created(){
mmfiles.insert(this);
}
/*static*/
int closingAllFiles = 0;
void MemoryMappedFile::closeAllFiles( stringstream &message ) {
if ( closingAllFiles ) {
message << "warning closingAllFiles=" << closingAllFiles << endl;
return;
}
++closingAllFiles;
for ( set<MemoryMappedFile*>::iterator i = mmfiles.begin(); i != mmfiles.end(); i++ )
(*i)->close();
message << " closeAllFiles() finished" << endl;
--closingAllFiles;
}
void MemoryMappedFile::updateLength( const char *filename, int &length ) const {
if ( !boost::filesystem::exists( filename ) )
return;
// make sure we map full length if preexisting file.
boost::uintmax_t l = boost::filesystem::file_size( filename );
assert( l <= 0x7fffffff );
length = (int) l;
}
void* MemoryMappedFile::map(const char *filename) {
boost::uintmax_t l = boost::filesystem::file_size( filename );
assert( l <= 0x7fffffff );
return map( filename , (int) l );
}
} // namespace mongo
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