[lug] Fwd: Simple counter?

[Bear Giles]

Too bad there isn't a /dev/counter.


On Fri, May 24, 2013 at 9:44 AM, Michael J. Hammel <
mjhammel at graphics-muse.org> wrote:

> On Fri, 2013-05-24 at 09:39 -0600, Jeffrey S. Haemer wrote:
>
> > I want something that returns me sequential integers.  I ask it, I get
> > a 1.  Three more times?  I get 2,3,4.  You ask it, you get 5, I ask
> > again, I get 6, and so on.  If we both call it at the same time, we
> > should *not* get the same number.
>
> It's been awhile since I've used it, but I think MySQL has a field that
> is auto-incrementing.  Not sure about being able to read it without it
> updating, though.  Something tells me that there may be configurable
> options for such a field since its a fairly common need.
>
> The nice thing I remember about this is that all accesses to it are
> serialized, so we can both read it and the first one it gets the first
> increment and the next one in gets the next increment.
>
> --
> Michael J. Hammel <mjhammel at graphics-muse.org>
>
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