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.. rst-class:: align-right

built-in predicate

.. index:: pair: threaded_engine_self/1; Built-in predicate .. _predicates_threaded_engine_self_1:

threaded_engine_self/1

Description

::

threaded_engine_self(Engine)

Queries the name of engine calling the predicate. Fails if not called from within an engine or if the argument doesn't unify with the engine name.

.. note::

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

Modes and number of proofs

::

threaded_engine_self(?nonvar) - zero_or_one

Errors

(none)

Examples

::

% find the name of the engine making the query: ..., threaded_engine_self(Engine), ...

% check if the the engine making the query is worker_1: ..., threaded_engine_self(worker_1), ...

.. seealso::

:ref:predicates_threaded_engine_create_3, :ref:predicates_threaded_engine_destroy_1, :ref:predicates_threaded_engine_1