Subj : Re: How to deal with errno in a multipthread program
To   : comp.programming.threads
From : Paul Pluzhnikov
Date : Sat Apr 16 2005 08:28 am

Eric Sosman <eric.sosman@sun.com> writes:

>     However, you do not need to worry.  The thread
> implementation itself arranges to have a unique `errno'
> for each thread:

Minor correction: the thread implementation will do so *provided*
you compile your program correctly for MT execution.

On Solaris, that means adding '-mt' flag if using WorkShop compilers
or '-pthreads' if using gcc.

On Linux, errno is thread-safe without any flags at all, but
'-pthread' ([1]) is recommended anyway.

On AIX, -D_THREADS is required (IIRC).

The OP should read his compiler documentation and/or system headers
to figure out what (if anything) is needed on his platform.

Cheers,

[1] Yes, this is not a typo: the Solaris and Linux gcc options
differ: '-pthreads' vs. '-pthread'. There might be a good reason
for this, but I do not know it. If you do, please let me know.
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