[Scons-users] Making some tools run only one at a time

[Plunket, Tom]

Hey gang,

I've searched the archives but haven't come up with anything; apologies
if this is obvious somewhere but I haven't seen it.

I'm building a data processing pipeline backed by SCons. I've defined a
few tools to do the things that need to be done but I would like to flag
a couple of them as "only run one of these at a time."

SCons is the framework that I'm relying on as I split a
mega-do-everything tool into smaller tools that do different aspects of
the build job. One stage of the pipeline opens up a heavyweight art
package and drives an export of the data into a file format that I can
process elsewhere. Another stage of the pipeline will take a list of
bitmaps and send them to a video compressor.

It doesn't really matter what the tools are but the problem I'm looking
to address is that when I multithread my build, it starts with the art
export and so it fires up eight (on my machine) instances of this
heavyweight art package when running them serially (or better yet,
collecting all of the files that need to be exported and then just
process them all serially in one instance of the tool) would actually be
prefereable. And then on the video compressor tool, that tool already
takes advantage of multiple cores so I'd like to only execute those one
at a time as well. Certianly I could put a wait into the generator but
that would presumably prevent other things from running.

Is there a way to do this that I've missed? Even maybe something like
returning from a generator, "not yet, homeboy, wait your turn"?

Thanks.





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