Hi all,
There is a an option 'constructable' in halcompile that should make it
possible to instantiate a component from an already loaded module. The
halcmd instruction 'newinst' would then call down to the module via
rtapi_app and call the constructor.
However, the option 'constructable' is not documented in halcompile. The
'newinst' option to halcmd has been commented out with an #if 0 with the
comment "newinst deferred to version 2.2". The 'newinst' code is present
in rtapi_app.
The problem is that the constructor signature is missing "const" in its
arguments and the rtapi_app call down to HAL uses private internal
functions. Both can be fixed easily and are already prepared to be
fixed. There are no in-tree components or code using any of this.
However, out-of-tree code could potentially, however unlikely, use it.
Therefore, changing any of it is a risk, however small it may be.
So, the question is: Does anybody use 'constructable' components and
direct calls to rtapi_app with 'newinst' to instantiate components from
the same module?
--
Greetings Bertho
(disclaimers are disclaimed)
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