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// mmap.cpp
#include "stdafx.h"
#include "mmap.h"
set<MemoryMappedFile*> mmfiles;
MemoryMappedFile::~MemoryMappedFile() {
close();
mmfiles.erase(this);
}
/*static*/
void MemoryMappedFile::closeAllFiles() {
for( set<MemoryMappedFile*>::iterator i = mmfiles.begin(); i != mmfiles.end(); i++ )
(*i)->close();
cout << " closeAllFiles() finished" << endl;
}
#if defined(_WIN32)
#include "windows.h"
MemoryMappedFile::MemoryMappedFile() {
fd = 0; maphandle = 0; view = 0;
mmfiles.insert(this);
}
void MemoryMappedFile::close() {
if( view )
UnmapViewOfFile(view);
view = 0;
if( maphandle )
CloseHandle(maphandle);
maphandle = 0;
if( fd )
CloseHandle(fd);
fd = 0;
}
std::wstring toWideString(const char *s) {
std::basic_ostringstream<TCHAR> buf;
buf << s;
return buf.str();
}
unsigned mapped = 0;
void* MemoryMappedFile::map(const char *filename, int length) {
std::wstring filenamew = toWideString(filename);
fd = CreateFile(
filenamew.c_str(), GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if( fd == INVALID_HANDLE_VALUE ) {
cout << "CreateFile failed " << filename << endl;
return 0;
}
#if defined(_WIN32)
if( mapped > 500000000 ) {
cout << "WARNING: too much mem mapped for win32" << endl;
// if( length > 50000000 )
// length = 50000000;
}
mapped += length;
#endif
maphandle = CreateFileMapping(fd, NULL, PAGE_READWRITE, 0, length, NULL);
if( maphandle == NULL ) {
cout << "CreateFileMapping failed " << filename << endl;
return 0;
}
view = MapViewOfFile(maphandle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if( view == 0 )
cout << "MapViewOfFile failed " << filename << " errno:" << GetLastError() << endl;
return view;
}
void MemoryMappedFile::flush(bool) {
}
#else
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
MemoryMappedFile::MemoryMappedFile() {
fd = 0; maphandle = 0; view = 0; len = 0;
mmfiles.insert(this);
}
void MemoryMappedFile::close() {
mmfiles.erase(this);
if( view )
munmap(view, len);
view = 0;
if( fd )
::close(fd);
fd = 0;
}
#ifndef O_NOATIME
#warning NO O_NOATIME
#define O_NOATIME 0
#endif
void* MemoryMappedFile::map(const char *filename, int length) {
len = length;
fd = open(filename, O_CREAT | O_RDWR | O_NOATIME, S_IRUSR | S_IWUSR);
if( !fd ) {
cout << "couldn't open " << filename << ' ' << errno << endl;
return 0;
}
/* make sure the file is the full desired length */
off_t filelen = lseek(fd, 0, SEEK_END);
if( filelen < length ) {
cout << "map: file length=" << filelen << " want:" << length << endl;
if( filelen != 0 ) {
cout << " failing mapping" << endl;
return 0;
}
cout << " writing file to full length with zeroes..." << endl;
int z = 8192;
char buf[z];
memset(buf, 0, z);
int left = length;
while( 1 ) {
if( left <= z ) {
write(fd, buf, left);
break;
}
write(fd, buf, z);
left -= z;
}
cout << " done" << endl;
}
lseek(fd, length, SEEK_SET);
write(fd, "", 1);
view = mmap(NULL, length, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
return view;
}
void MemoryMappedFile::flush(bool sync) {
if( msync(view, len, sync ? MS_SYNC : MS_ASYNC) )
cout << "msync error " << errno << endl;
}
#endif
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