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Re: Is errno thread-safe?

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Re: Is errno thread-safe?

Subject: Re: Is errno thread-safe?
From: Andrew Pinski <email@hidden>
Date: Thu, 7 Mar 2002 12:07:41 -0500

Yes!!!

On Thursday, March 7, 2002, at 03:50 , Malte Tancred wrote:

Hi all!

I found the following in <sys/errno.h>:

#if !defined(KERNEL) && !defined(KERNEL_PRIVATE)
#include <sys/cdefs.h>
__BEGIN_DECLS
extern int * __error __P((void));
#define errno (*__error())
__END_DECLS
#endif

Does this mean errno is thread-safe?

For example, encountering an error when reading on a socket in a separate thread, I can safely assume that errno is set appropriately and not reset by another system call in the main thread?

Thanks,
Malte

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