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// <latch> -*- C++ -*- // Copyright (C) 2020-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/latch * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_LATCH #define _GLIBCXX_LATCH 1 #pragma GCC system_header #if __cplusplus > 201703L #include <bits/atomic_base.h> #include <ext/numeric_traits.h> #if __cpp_lib_atomic_wait namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #define __cpp_lib_latch 201907L class latch { public: static constexpr ptrdiff_t max() noexcept { return __gnu_cxx::__int_traits<__detail::__platform_wait_t>::__max; } constexpr explicit latch(ptrdiff_t __expected) noexcept : _M_a(__expected) { } ~latch() = default; latch(const latch&) = delete; latch& operator=(const latch&) = delete; _GLIBCXX_ALWAYS_INLINE void count_down(ptrdiff_t __update = 1) { auto const __old = __atomic_impl::fetch_sub(&_M_a, __update, memory_order::release); if (__old == __update) __atomic_impl::notify_all(&_M_a); } _GLIBCXX_ALWAYS_INLINE bool try_wait() const noexcept { return __atomic_impl::load(&_M_a, memory_order::acquire) == 0; } _GLIBCXX_ALWAYS_INLINE void wait() const noexcept { auto const __pred = [this] { return this->try_wait(); }; std::__atomic_wait_address(&_M_a, __pred); } _GLIBCXX_ALWAYS_INLINE void arrive_and_wait(ptrdiff_t __update = 1) noexcept { count_down(__update); wait(); } private: alignas(__alignof__(__detail::__platform_wait_t)) __detail::__platform_wait_t _M_a; }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // __cpp_lib_atomic_wait #endif // __cplusplus > 201703L #endif // _GLIBCXX_LATCH
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