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\part{Application thorn writing}
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\chapter{Thorn concepts}
(This section has to contain enough explanation to make the rest of
the writers guide readable the first time through)
(The hardest bugs to find are
those arising from plausible but incorrect assumptions about the
behavior of someone else's thorn.)
a) Again probably emphasize collaboration, what are thorns,
toolkits, how to share them.
b) Things to think about before you start programming:
Language, read all the documentation, emphasize use of
standard supported Cactus infrastructure
c) Available data types
i) Scalars
ii) Arrays and GFs
iii) Groups
d) Ghost zones and parallelism
e) Understanding the RFR concept
f) Understanding the GH concept
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\chapter{Anatomy of a thorn}
Each thorn must be in a toolkit. Toolkits are fairly informal. If you
want, you can just make your own toolkit directory, and stick your new
thorn into it.
a) Creating a thorn (gmake new thorn)
b) Thorn directory structure
c) Thorn make files
d) Thorn configuration
(i) Parameters (param.ccl)
(ii) Variables (interface.ccl)
(iii) Scheduler (schedule.ccl)
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\chapter{Putting code into your thorn}
a) What the flesh basically provides (header files, macros, ...)
b) Argument lists and parameters
c) A simple example (Baloney)
d) Differences between F and C with the interface
e) A more complex example (Wavetoy)
f) Error handling and code stopping
g) Calling C from F, F from C, (C++ from F? ....)
h) Good Cactus Style Programming Guidelines
i) Adding a test suite
j) Sharing your thorn with the world.
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