Subj : Re: How to deal with errno in a multipthread program
To   : comp.programming.threads
From : icoming
Date : Sat Apr 16 2005 04:51 am

>> Is it enough to deal with it as follow:
>> int err=errno;
>> func();  //this function may modify the errno
>> errno=err;
>> I read W.Richard Stevens's UNIX Network Programming, it uses this
way,
>> but I do not think it's enough, but do not know there is better one.



>    What is the problem you are trying to solve?
>    DS

I thought errno is a global variable, and worried that in a multithread
program the functions which will change the value of errno can not work
well.
For example, Func1() which will change errno is called by Thread A,  a
schedule happens, Thread B runs, and called Func2() which will also
change errno. Now Thread A is scheduled to run again, but the errno has
changed by Func2().
But Eric Sosman said that every thread has its own errno, and asked me
not to worry about it.

.