built-in predicate

threaded_engine_next_reified/2

Description

threaded_engine_next_reified(Engine, Answer)

Retrieves an answer from an engine and signals it to start computing the next answer. This predicate always succeeds and blocks until an answer becomes available. Answers are returned using the terms the(Answer), no, and exception(Error).

Note

This predicate requires a backend Prolog compiler providing compatible multi-threading primitives. The value of the read-only engines flag is set to supported when that is the case.

Modes and number of proofs

threaded_engine_next_reified(@nonvar, ?nonvar) - one

Errors

Engine is a variable:

instantiation_error

Engine is neither a variable nor the name of an existing engine:

existence_error(engine, Engine)

Examples

% get the next reified answer from the worker_1 engine:
| ?- threaded_engine_next_reified(worker_1, Answer).

See also

threaded_engine_create/3, threaded_engine_next/2, threaded_engine_yield/1