1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___STOP_TOKEN_STOP_TOKEN_H
11#define _LIBCPP___STOP_TOKEN_STOP_TOKEN_H
12
13#include <__availability>
14#include <__config>
15#include <__stop_token/intrusive_shared_ptr.h>
16#include <__stop_token/stop_state.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN) && !defined(_LIBCPP_HAS_NO_THREADS)
25
26class _LIBCPP_AVAILABILITY_SYNC stop_token {
27public:
28  _LIBCPP_HIDE_FROM_ABI stop_token() noexcept = default;
29
30  _LIBCPP_HIDE_FROM_ABI stop_token(const stop_token&) noexcept            = default;
31  _LIBCPP_HIDE_FROM_ABI stop_token(stop_token&&) noexcept                 = default;
32  _LIBCPP_HIDE_FROM_ABI stop_token& operator=(const stop_token&) noexcept = default;
33  _LIBCPP_HIDE_FROM_ABI stop_token& operator=(stop_token&&) noexcept      = default;
34  _LIBCPP_HIDE_FROM_ABI ~stop_token()                                     = default;
35
36  _LIBCPP_HIDE_FROM_ABI void swap(stop_token& __other) noexcept { __state_.swap(__other.__state_); }
37
38  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool stop_requested() const noexcept {
39    return __state_ != nullptr && __state_->__stop_requested();
40  }
41
42  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool stop_possible() const noexcept {
43    return __state_ != nullptr && __state_->__stop_possible_for_stop_token();
44  }
45
46  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI friend bool operator==(const stop_token&, const stop_token&) noexcept = default;
47
48  _LIBCPP_HIDE_FROM_ABI friend void swap(stop_token& __lhs, stop_token& __rhs) noexcept { __lhs.swap(__rhs); }
49
50private:
51  __intrusive_shared_ptr<__stop_state> __state_;
52
53  friend class stop_source;
54  template <class _Tp>
55  friend class stop_callback;
56
57  _LIBCPP_HIDE_FROM_ABI explicit stop_token(const __intrusive_shared_ptr<__stop_state>& __state) : __state_(__state) {}
58};
59
60#endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN) && !defined(_LIBCPP_HAS_NO_THREADS)
61
62_LIBCPP_END_NAMESPACE_STD
63
64#endif // _LIBCPP___STOP_TOKEN_STOP_TOKEN_H
65