[DGD] Paranoid about MP

[Felix A. Croes]

Shentino <shentino at gmail.com> wrote:

> I did some reading about how MP was going to be implemented and ran
> across a concern.
>
> Do I need to be worried about reordering of threads?

Yes.


> More to the point:
>
> Barring speed differences, is it guaranteed that execution rounds in
> MP will execute in the same order as in UP?  Or can threads commit in
> a different order than they started in?
>
> Examples:
>
> callout 1 (0 second) is scheduled
> callout 2 (0 second) is scheduled
>
> but if callout 2 is faster, it might commit before callout 1.
>
> Is this a concern or am I just being paranoid?

The best way to make absolutely sure that callout 1 commits before
callout 2, is to start callout 2 from callout 1.

Regards,
Dworkin