I have a question about signal in openGEODO

[zongz1024]

I wonder where the signal is defined. I can only get its name in the example . I wonder some other information about the siganl such as the type of this signal(int ? float ? or something else?) .

[maxime-esa]

Sorry I don't understand the question.
The signal declarations are visible on your screenshot:

signal run;
signal saved_signal (BoolType);   -- means the parameter is of type BoolType
...

[zongz1024]

Sorry I don't understand the question.
The signal declarations are visible on your screenshot:

signal run;
signal saved_signal (BoolType);   -- means the parameter is of type BoolType
...

what type of the signal named run?????

signal run ; -- int ???? bool ???? or something else ????

[maxime-esa]

A signal in SDL is an asynchronous message, which (by definition) does not return a value. Therefore what you call type of the signal does not exist in SDL.