Allow files to be opened for reading multiple times

src/leveldb/util/env_win.cc

@@ -420,7 +420,7 @@ BOOL Win32RandomAccessFile::_Init( LPCWSTR path )
 {
     BOOL bRet = FALSE;
     if(!_hFile)
-        _hFile = ::CreateFileW(path,GENERIC_READ,0,NULL,OPEN_EXISTING,
+        _hFile = ::CreateFileW(path,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,
         FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS,NULL);
     if(!_hFile || _hFile == INVALID_HANDLE_VALUE )
         _hFile = NULL;