Did you know ... | Search Documentation: |
![]() | Pack logtalk -- logtalk-3.81.0/manuals/_sources/refman/predicates/threaded_engine_create_3.rst.txt |
.. This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2024 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
.. rst-class:: align-right
built-in predicate
.. index:: pair: threaded_engine_create/3; Built-in predicate .. _predicates_threaded_engine_create_3:
::
threaded_engine_create(AnswerTemplate, Goal, Engine)
Creates a new engine for proving the given goal and defines an answer template for retrieving the goal solution bindings. A message queue for passing arbitrary terms to the engine is also created. If the name for the engine is not given, a unique name is generated and returned. Engine names shall be regarded as opaque terms; users shall not rely on its type.
.. 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.
::
threaded_engine_create(*, 0, *)
::
threaded_engine_create(@term, @callable, @nonvar)
- one
threaded_engine_create(@term, @callable, --nonvar) - one
| Goal
is a variable:
| instantiation_error
| Goal
is neither a variable nor a callable term:
| type_error(callable, Goal)
| Engine
is the name of an existing engine:
| permission_error(create, engine, Engine)
::
% create a new engine for finding members of a list:
| ?- threaded_engine_create(X, member(X, [1,2,3]), worker_1)
.
.. seealso::
:ref:predicates_threaded_engine_destroy_1
,
:ref:predicates_threaded_engine_self_1
,
:ref:predicates_threaded_engine_1
,
:ref:predicates_threaded_engine_next_2
,
:ref:predicates_threaded_engine_next_reified_2