* Melchior FRANZ -- Wednesday 03 December 2008:
> JSBSim manages this property and writes to it once per
> FDM cycle[1], [...]
> [1] JSBSim.cxx:881 -- FGJSBsim::copy_from_JSBsim()
And here's the "Making-Of" this little analysis, in case
someone needs something like that in other cases:
- open the property browser in /gear/tailhook/ and
Ctrl-click on the "." entry. This enables a verbose
mode. You see that there is no 'w' (write-protected)
or 'r'. Alternatively, you can type this into the
Nasal console:
debug.tree("/gear/tailhook");
and get this in the terminal window:
tailhook/
. position-norm = 0 (DOUBLE, #4)
again: no 'r' or 'w' [would have been (DOUBLE, w, #4) then]
- in the Nasal console attach a listener to see what's up
with that property:
setlistener("/gear/tailhook/position-norm", func(n) print(n.getValue()));
You see the terminal flooded with "0". So apparently
something is writing zeros.
- attach an abort listener to see which code is doing that:
setlistener("/gear/tailhook/position-norm", abort);
This generates a core dump, and the backtrace looks like
this:
#13 0x085cfc3c in SGPropertyNode::setDoubleValue
(this=0x1047af90, value=1) at simgear/props/props.cxx:1427
#14 0x0813ad29 in FGJSBsim::copy_from_JSBsim
(this=0x1083f088) at src/FDM/JSBSim/JSBSim.cxx:881
#15 0x0815f608 in FGJSBsim::update (this=0x1083f088,
dt=0.041666666666666664) at src/FDM/JSBSim/JSBSim.cxx:514
#16 0x0806f41a in fgUpdateTimeDepCalcs () at src/Main/main.cxx:157
m.
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