Did you know ... | Search Documentation: |
Pack logtalk -- logtalk-3.77.0/manuals/_sources/refman/predicates/threaded_engine_next_reified_2.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_next_reified/2; Built-in predicate .. _predicates_threaded_engine_next_reified_2:
::
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 :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_next_reified(@nonvar, ?nonvar) - one
| Engine
is a variable:
| instantiation_error
| Engine
is neither a variable nor the name of an existing engine:
| existence_error(engine, Engine)
::
% get the next reified answer from the worker_1 engine:
| ?- threaded_engine_next_reified(worker_1, Answer)
.
.. seealso::
:ref:predicates_threaded_engine_create_3
,
:ref:predicates_threaded_engine_next_2
,
:ref:predicates_threaded_engine_yield_1