pengine_event/1

Availability::- use_module(library(pengines)).

[det]pengine_event(?EventTerm)

[det]pengine_event(?EventTerm, +Options)

Examines the pengine's event queue and if necessary blocks execution until a term that unifies to Term arrives in the queue. After a term from the queue has been unified to Term, the term is deleted from the queue.

Valid options are:

timeout(+Time): Time is a float or integer and specifies the maximum time to wait in seconds. If no event has arrived before the time is up EventTerm is bound to the atom timeout.
listen(+Id): Only listen to events from the pengine identified by Id.