Subj : Re: Is std::cerr thread safe
To   : comp.programming.threads
From : Joe Seigh
Date : Wed Jul 20 2005 03:48 pm

nin234@yahoo.com wrote:
> I was under the impression that std::cerr, cout etc were multi thread
> safe. I recently changed the logging utility of our product ( a daemon
> running on linux (RHEL) to use std::cerr instead of printf and it
> produces garbled output to the log file.
> What is the best approach to make it thread safe?
> Should I use some sort of wrapper class?
> 
printf to stdout or fprintf to stderr?   Though I not sure it
makes any difference.  By garbled output I assume you mean
interleaved or mixed together output.  There no guarantee
of atomicity on i/o.  You should probably use a lock for output
you want to appear together and not get intermixed with other
output.

-- 
Joe Seigh

When you get lemons, you make lemonade.
When you get hardware, you make software.

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