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1 | // <semaphore> -*- C++ -*- |
2 | ||
a945c346 | 3 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
83a1beee | 4 | // |
88202c88 | 5 | // This file is part of the GNU ISO C++ Library. This library is free |
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6 | // software; you can redistribute it and/or modify it under the |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
88202c88 | 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
83a1beee TR |
14 | // GNU General Public License for more details. |
15 | ||
16 | // Under Section 7 of GPL version 3, you are granted additional | |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
88202c88 | 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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23 | // <http://www.gnu.org/licenses/>. |
24 | ||
25 | /** @file include/semaphore | |
26 | * This is a Standard C++ Library header. | |
27 | */ | |
28 | ||
29 | #ifndef _GLIBCXX_SEMAPHORE | |
61c71a62 | 30 | #define _GLIBCXX_SEMAPHORE 1 |
83a1beee TR |
31 | |
32 | #pragma GCC system_header | |
33 | ||
18f176d0 AA |
34 | #include <bits/requires_hosted.h> // concurrency |
35 | ||
83a1beee | 36 | #if __cplusplus > 201703L |
83a1beee | 37 | #include <bits/semaphore_base.h> |
83a1beee | 38 | |
083b7f28 AA |
39 | #define __glibcxx_want_semaphore |
40 | #include <bits/version.h> | |
41 | ||
42 | #ifdef __cpp_lib_semaphore // C++ >= 20 && hosted && (atomic_wait || posix_sem) | |
83a1beee TR |
43 | namespace std _GLIBCXX_VISIBILITY(default) |
44 | { | |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
46 | ||
b52aef3a | 47 | template<ptrdiff_t __least_max_value = __semaphore_impl::_S_max> |
83a1beee TR |
48 | class counting_semaphore |
49 | { | |
50 | static_assert(__least_max_value >= 0); | |
b52aef3a | 51 | static_assert(__least_max_value <= __semaphore_impl::_S_max); |
83a1beee | 52 | |
b52aef3a | 53 | __semaphore_impl _M_sem; |
83a1beee TR |
54 | |
55 | public: | |
56 | explicit counting_semaphore(ptrdiff_t __desired) noexcept | |
57 | : _M_sem(__desired) | |
58 | { } | |
59 | ||
60 | ~counting_semaphore() = default; | |
61 | ||
62 | counting_semaphore(const counting_semaphore&) = delete; | |
63 | counting_semaphore& operator=(const counting_semaphore&) = delete; | |
64 | ||
65 | static constexpr ptrdiff_t | |
66 | max() noexcept | |
67 | { return __least_max_value; } | |
68 | ||
69 | void | |
70 | release(ptrdiff_t __update = 1) noexcept(noexcept(_M_sem._M_release(1))) | |
71 | { _M_sem._M_release(__update); } | |
72 | ||
73 | void | |
74 | acquire() noexcept(noexcept(_M_sem._M_acquire())) | |
75 | { _M_sem._M_acquire(); } | |
76 | ||
77 | bool | |
78 | try_acquire() noexcept(noexcept(_M_sem._M_try_acquire())) | |
79 | { return _M_sem._M_try_acquire(); } | |
80 | ||
81 | template<typename _Rep, typename _Period> | |
82 | bool | |
83 | try_acquire_for(const std::chrono::duration<_Rep, _Period>& __rtime) | |
84 | { return _M_sem._M_try_acquire_for(__rtime); } | |
85 | ||
86 | template<typename _Clock, typename _Dur> | |
87 | bool | |
88 | try_acquire_until(const std::chrono::time_point<_Clock, _Dur>& __atime) | |
89 | { return _M_sem._M_try_acquire_until(__atime); } | |
90 | }; | |
91 | ||
3621a7bb JW |
92 | using binary_semaphore = std::counting_semaphore<1>; |
93 | ||
83a1beee TR |
94 | _GLIBCXX_END_NAMESPACE_VERSION |
95 | } // namespace | |
4b2db807 | 96 | #endif // cpp_lib_atomic_wait || _GLIBCXX_HAVE_POSIX_SEMAPHORE |
083b7f28 | 97 | #endif // __cpp_lib_semaphore |
83a1beee | 98 | #endif // _GLIBCXX_SEMAPHORE |