built-in predicate

`threaded_engine/1`ï

Descriptionï

threaded_engine(Engine)

Enumerates, by backtracking, all existing engines. Engine names shall be regarded as opaque terms; users shall not rely on their type.

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 proofsï

threaded_engine(?nonvar) - zero_or_more

Errorsï

(none)

Examplesï

% check that the worker_1 engine exists:
| ?- threaded_engine(worker_1).

% write the names of all existing engines:
| ?- forall(
         threaded_engine(Engine),
         (writeq(Engine), nl)
     ).

See also

threaded_engine_create/3, threaded_engine_self/1, threaded_engine_destroy/1