[Swift-devel] could we set the job sequence without a file dependency?

[Ian Foster]

These discussions are very reminiscent of PCN, where we had many of  
the same issues.

A reason then for wanting sequencing was for output.

We introduced a sequential operator, which had the advantage that  
people could say more directly what they meant.


On Mar 24, 2009, at 9:06 AM, Ben Clifford wrote:

>
> On Tue, 24 Mar 2009, Zhao Zhang wrote:
>
>> Say, Job A is broadcasting common data shared for all jobs. And Job  
>> B only
>> needs to know that Job A is done, so he could read the common data.
>
> ok, so there is a data dependency.
>
> You can externals (like Mike has been using on the swift-user list) to
> represent data dependencies like that.
>
> app (external commonData) A() {
>  ...
> }
>
> app B(external commonData) {
> ...
> }
>
> external d = A();
> B(d);
>
> d represents your shared data set - by declaring it as 'external'  
> you say
> that Swift should do data dependency handling, but should not  
> attempt to
> manage the data itself.
>
> d is mapped to the data, but in your head, rather than in Swift.
>
> -- 
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