96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// <semaphore> -*- C++ -*-
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// Copyright (C) 2020-2022 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/semaphore
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_SEMAPHORE
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#define _GLIBCXX_SEMAPHORE 1
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#pragma GCC system_header
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#if __cplusplus > 201703L
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#include <bits/semaphore_base.h>
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#if __cpp_lib_atomic_wait || _GLIBCXX_HAVE_POSIX_SEMAPHORE
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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#define __cpp_lib_semaphore 201907L
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template<ptrdiff_t __least_max_value = __semaphore_impl::_S_max>
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class counting_semaphore
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{
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static_assert(__least_max_value >= 0);
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static_assert(__least_max_value <= __semaphore_impl::_S_max);
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__semaphore_impl _M_sem;
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public:
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explicit counting_semaphore(ptrdiff_t __desired) noexcept
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: _M_sem(__desired)
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{ }
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~counting_semaphore() = default;
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counting_semaphore(const counting_semaphore&) = delete;
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counting_semaphore& operator=(const counting_semaphore&) = delete;
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static constexpr ptrdiff_t
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max() noexcept
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{ return __least_max_value; }
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void
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release(ptrdiff_t __update = 1) noexcept(noexcept(_M_sem._M_release(1)))
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{ _M_sem._M_release(__update); }
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void
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acquire() noexcept(noexcept(_M_sem._M_acquire()))
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{ _M_sem._M_acquire(); }
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bool
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try_acquire() noexcept(noexcept(_M_sem._M_try_acquire()))
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{ return _M_sem._M_try_acquire(); }
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template<typename _Rep, typename _Period>
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bool
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try_acquire_for(const std::chrono::duration<_Rep, _Period>& __rtime)
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{ return _M_sem._M_try_acquire_for(__rtime); }
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template<typename _Clock, typename _Dur>
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bool
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try_acquire_until(const std::chrono::time_point<_Clock, _Dur>& __atime)
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{ return _M_sem._M_try_acquire_until(__atime); }
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};
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using binary_semaphore = std::counting_semaphore<1>;
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // cpp_lib_atomic_wait || _GLIBCXX_HAVE_POSIX_SEMAPHORE
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#endif // C++20
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#endif // _GLIBCXX_SEMAPHORE
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