Updating a module level shared dictionary

[Ian Kelly]

On Tue, Jun 15, 2010 at 7:04 PM, Vishal Rana <ranavishal at gmail.com> wrote:
> Hi,
> A module level dictionary 'd' and is accessed by different threads/requests
> in a django web application. I need to update 'd' every minute with a new
> data and the process takes about 5 seconds.
> What could be best solution where I want the users to get either the old
> value or the new and nothing in between.
> I can think of a solution where a temp dictionary is constructed with a new
> data and assigned to 'd' but now sure how this works!
> Appreciate your ideas.
> Thanks

Constructing a new dictionary out-of-place and then assigning it to
the proper name sounds perfectly reasonable to me.  Since the
assignment operation is atomic, you shouldn't even need to guard it
with a mutex.

Cheers,
Ian