* tangyong -- Friday 15 December 2006 09:22:
I found that there are many main() functions in the Flight Gear,
fgfs contains only one main(), and it's in src/Main/bootstrap.cxx.
All other main()s that you found are actually separate applications,
and of them only terrasync could be remotely considered a subsystem
(which communicates with fgfs exclusively via socket). Most of the
rest are standalone test applications or helpers that aren't meant
to run at the same time with fgfs (e.g. utils/fgadmin/) and don't
communicate with it.
they communicate with each other through setting and getting the
property tree nodes valus.
So-called subsystems are part of fgfs and linked into the executable.
They are managed by SimGear (see simgear/structure/subsystem_mgr.cxx).
Subsystems communicate in one of the following ways:
(a) properties: this was envisioned to be the main form, but this
isn't really the case
(b) export-ed global variables/classes directly (for example
SGShadowVolume and for communication with threads), or via ...
(c) global FGGlobals class, where many other classes/subsystems are
registered and can be accessed from everywhere
(see src/Main/globals.[ch]xx)
(Did I forget something?)
m.
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