Re: Extended attributes and thread safety

On Aug 31, 2009, at 8:36, Chris Suter wrote:

> Hi Christian,
>
> On Sun, Aug 30, 2009 at 9:48 PM, Christiaan  
> Hofman<[email protected]> wrote:
>> Does anybody know whether it is safe to use the extended attribute  
>> C-library
>> at sys/xattr.h (getxattr, setxattr, etc) on background threads? The
>> documentation does not mention anything about thread safety, but I  
>> could
>> imagine it to run into problems if it'd use global resources, and the
>> functions seem to use at least one global variable.
>
> Those functions will be thread safe. It's a bug if they're not.
>
> Kind regards,
>
> Chris

Thanks Chris. However I am still worried about the fact that they  
access the global variable errno. Even if this is done in a thread  
safe way, how can I know when I inspect it that some other function  
has changed it on another thread?

Christiaan