Mutex LogFileMutex;

void WriteLogfile(String text) {
 LogFileMutex.Enter();
 Time zeit = GetSysTime();
 String zt = Format("[%i/%i/%i/ %i:%i:%i]", zeit.day, zeit.month, zeit.year, zeit.hour, zeit.minute, zeit.second);
 FileAppend file(m_LogFilename);
 file.PutLine(Format("%s %s", zt, text));
 file.Close();
 LogFileMutex.Leave();
}