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Predicate pengine_event_loop/2
Availability::- use_module(library(pengines)).
Source[det]pengine_event_loop(:Closure, +Options)
Starts an event loop accepting event terms sent to the current pengine or thread. For each such event E, calls ignore(call(Closure, E)). A closure thus acts as a handler for the event. Some events are also treated specially:
create(ID, Term)
The ID is placed in a list of active pengines.
destroy(ID)
The ID is removed from the list of active pengines. When the last pengine ID is removed, the loop terminates.
output(ID, Term)
The predicate pengine_pull_response/2 is called.

Valid options are:

autoforward(+To)
Forwards received event terms to slaves. To is either all, all_but_sender or a Prolog list of NameOrIDs. [not yet implemented]
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LogicalCaptain said (2020-01-26T18:53:02):0 upvotes 0 0 downvotes
Picture of user LogicalCaptain.

I think the use of "Closure" here is a bit misleading. It's just a "Goal" (necessarily atomic, as call/2 is used, so an "Event Handler Predicate"). There is no "code to be executed" in a context that was in existence when that code was wrapped into a manipulable object. In fact, the only execution contexts that Prolog knows are the contexts of the clause (not even of the procedure) and procedures or clauses cannot be passed around semi-evaluated, hence no Closures.

See also: https://www.swi-prolog.org/pldoc/doc_for?object=call/2