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![]() | Pack logtalk -- logtalk-3.81.0/manuals/_sources/refman/predicates/threaded_cancel_1.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
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.. rst-class:: align-right
built-in predicate
.. index:: pair: threaded_cancel/1; Built-in predicate .. _predicates_threaded_cancel_1:
::
threaded_cancel(Tag)
Cancels a tagged threaded call. When there is no asynchronous call with the given tag, calling this predicate succeeds assuming the asynchronous call have already terminated or canceled. The threaded call identifier tag is generated by calls to the :ref:`threaded_call/2 <predicates_threaded_call_1_2>` and :ref:`threaded_once/2 <predicates_threaded_once_1_2>` predicates. Tags shall be regarded as an opaque term; 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:`threads <flag_threads>` flag is set to supported
when that
is the case.
::
threaded_cancel(+nonvar)
- one
| Tag
is a variable:
| instantiation_error
(none)
.. seealso::
:ref:predicates_threaded_call_1_2
,
:ref:predicates_threaded_exit_1_2
,
:ref:predicates_threaded_ignore_1
,
:ref:predicates_threaded_once_1_2
,
:ref:predicates_threaded_1