You've been shown many approaches and many solutions already. You can serialize the log writing by locking the log file handle. You can write to different log files. You can write to a central logging process.

So far, I have not seen any try at using the code you've been given, only more questions on "how can I do this". I think you need to take a step back and identify how each solution will solve your problem and then choose the solution that you understand best.