threaded_peek(Goal) threaded_peek(Goal, Tag)
Checks if the result of proving
Goal in a new thread is already
available. This call succeeds or fails without blocking execution
waiting for a reply to be available.
The argument of this predicate should be a variant of the argument of
the corresponding threaded_call/1-2 call.
When the predicate argument is subsumed by the
threaded_peek/1 call will succeed iff its argument
unifies with an already available solution of the (more general) goal.
threaded_peek/2 accepts a threaded call identifier tag
generated by the calls to the threaded_call/1-2 and
threaded_once/1-2 predicates. Tags shall
be regarded as an opaque term; users shall not rely on its type.
Modes and number of proofs¶
threaded_peek(+callable) - zero_or_one threaded_peek(+callable, +nonvar) - zero_or_one