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

[Ben Clifford]

you can express sequencing. that's what extern lets you do.

On Tue, 24 Mar 2009, Ian Foster wrote:

> 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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>