Subject:
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Re: Drive types
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 9 Jan 2007 23:23:26 GMT
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Viewed:
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3166 times
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In lugnet.robotics, Philippe Hurbain wrote:
> > Using Precedes and Follows you can define as complex (or simple) a net of thread
> > inter-dependencies as you may need.
> >
> > John Hansen
>
> Thanks John - quite clear now. Though I still don't understand why there are 2
> different opcodes that can be used for more or less the same thing???
The presence of both opcodes comes from the early days of NBC when I was trying
to understand the executable file format (before the days of documentation) and
I knew that in the NXT-G compiler a clump had both upstream and downstream
dependencies. So I came up with "uses" and "requires" which Michael Barrett
Anderson recommended that I rename as "precedes" and "follows".
They both work toward achieving the same goal but from different directions (as
it were). Since the compiler checks to make sure the names listed in either a
Precedes or Follows statement are known task names the order that the tasks
occur in your source code file somewhat determines which form of these
statements should be used.
John Hansen
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Message is in Reply To:
 | | Re: Drive types
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| (...) Thanks John - quite clear now. Though I still don't understand why there are 2 different opcodes that can be used for more or less the same thing??? Philo (18 years ago, 9-Jan-07, to lugnet.robotics)
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