[fpc-devel] "Signals"

[Michael Schnell]

Yesterday, I had a discussion with a colleague about programming languages.

He said that he did not like Object-Pascal / fpc because it lacks the 
concept of "signals" he finds in other languages / libraries. (He is not 
an expert but discusses on base of rumors he collected.)

With "signals" he meant a kind of multi-target events.

He described that multiple parts (units) of a program (or even units 
within a set of sunning programs) can "subscribe" to a signal (or 
several of them), and whenever anyone "rises" a signal all subscribers 
get notified and can react.

Seemingly the execution line in such a "unit" might be as well the main 
thread or a worker-thread (or even another task/program) and the event 
handler can be defined to work on this thread (he did not elaborate if 
always or optionally a newly created thread can be used).

Unfortunately I was not able to come up with a similarly powerful 
concept available in fpc.

Any suggestions ?

-Michael