* 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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