Obviously this depends on the application making the callout. For all
the standard GT services, I believe the answer is no as I don't think
any of them do authz in a thread.

If someone were to write a threaded service using the callout, obviously
that changes things.

Von

Thawan Kooburat wrote:
> Hi,
>     I am writing a "Gridmap callout" module from an information
> provided by this link
> 
> http://www.globus.org/security/callouts/
> 
>    I am just a beginner for C programming but I would like to know if
> I have to make this module a thread-safe?
> 
>    I am planning to make this module read/update a particular file
> when it receive a request, but I am not sure if I have to implement
> any locking mechanism (which I still don't know how to do this) so
> that multiple requests do not interfere with each other.
> 
> 
> Thanks,
> 
> Thawan Koooubrat
> 
> Department of Computer Engineering
> Faculty of Engineering
> Chulalongkorn University
> 
> 

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