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// <experimental/timer> -*- C++ -*- |
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// Copyright (C) 2015-2021 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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|
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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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|
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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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|
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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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|
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/** @file experimental/timer |
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* This is a TS C++ Library header. |
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* @ingroup networking-ts |
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*/ |
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|
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#ifndef _GLIBCXX_EXPERIMENTAL_TIMER |
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#define _GLIBCXX_EXPERIMENTAL_TIMER 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus >= 201402L |
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|
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#include <chrono> |
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#include <system_error> |
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#include <thread> |
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#include <experimental/netfwd> |
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#include <experimental/io_context> |
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#include <experimental/bits/net.h> |
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|
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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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namespace experimental |
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{ |
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namespace net |
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{ |
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inline namespace v1 |
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{ |
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|
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/** @addtogroup networking-ts |
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* @{ |
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*/ |
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|
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template<typename _Clock> |
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struct wait_traits |
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{ |
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static typename _Clock::duration |
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to_wait_duration(const typename _Clock::duration& __d) |
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{ return __d; } |
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|
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static typename _Clock::duration |
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to_wait_duration(const typename _Clock::time_point& __t) |
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{ |
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auto __now = _Clock::now(); |
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auto __diff = __t - __now; |
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if (__diff > _Clock::duration::max()) |
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return _Clock::duration::max(); |
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if (__diff < _Clock::duration::min()) |
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return _Clock::duration::min(); |
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return __diff; |
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} |
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}; |
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|
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template<typename _Clock, typename _WaitTraits> |
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class basic_waitable_timer |
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{ |
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public: |
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// types: |
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|
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using executor_type = io_context::executor_type; |
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using clock_type = _Clock; |
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using duration = typename clock_type::duration; |
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using time_point = typename clock_type::time_point; |
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using traits_type = _WaitTraits; |
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|
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// construct / copy / destroy: |
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|
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explicit |
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basic_waitable_timer(io_context& __ctx) |
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: _M_ex(__ctx.get_executor()), _M_expiry() |
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{ } |
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|
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basic_waitable_timer(io_context& __ctx, const time_point& __t) |
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: _M_ex(__ctx.get_executor()), _M_expiry(__t) |
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{ } |
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|
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basic_waitable_timer(io_context& __ctx, const duration& __d) |
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: _M_ex(__ctx.get_executor()), _M_expiry(_Clock::now() + __d) |
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{ } |
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|
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basic_waitable_timer(const basic_waitable_timer&) = delete; |
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|
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basic_waitable_timer(basic_waitable_timer&& __rhs) |
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: _M_ex(std::move(__rhs._M_ex)), _M_expiry(__rhs._M_expiry) |
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{ |
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_M_key.swap(__rhs._M_key); |
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__rhs._M_expiry = time_point{}; |
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} |
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|
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~basic_waitable_timer() { cancel(); } |
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|
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basic_waitable_timer& operator=(const basic_waitable_timer&) = delete; |
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|
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basic_waitable_timer& |
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operator=(basic_waitable_timer&& __rhs) |
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{ |
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if (this == std::addressof(__rhs)) |
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return *this; |
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cancel(); |
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_M_ex = std::move(__rhs._M_ex); |
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_M_expiry = __rhs._M_expiry; |
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__rhs._M_expiry = time_point{}; |
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_M_key.swap(__rhs._M_key); |
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return *this; |
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} |
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|
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// basic_waitable_timer operations: |
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|
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executor_type get_executor() noexcept { return _M_ex; } |
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|
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size_t cancel() { return _M_ex.context().cancel(*this); } |
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size_t cancel_one() { return _M_ex.context().cancel_one(*this); } |
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|
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time_point expiry() const { return _M_expiry; } |
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|
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size_t expires_at(const time_point& __t) |
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{ |
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size_t __cancelled = cancel(); |
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_M_expiry = __t; |
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return __cancelled; |
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} |
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|
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size_t expires_after(const duration& __d) |
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{ return expires_at(_Clock::now() + __d); } |
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|
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void wait(); |
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void wait(error_code& __ec); |
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|
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template<typename _CompletionToken> |
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__deduced_t<_CompletionToken, void(error_code)> |
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async_wait(_CompletionToken&& __token) |
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{ |
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async_completion<_CompletionToken, void(error_code)> __init(__token); |
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_M_ex.context().async_wait(*this, |
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std::move(__init.completion_handler)); |
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return __init.result.get(); |
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} |
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private: |
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executor_type _M_ex; |
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time_point _M_expiry; |
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|
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struct _Key { }; // TODO move _M_expiry into here? |
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unique_ptr<_Key> _M_key{new _Key}; |
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|
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friend class io_context; |
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}; |
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|
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using system_timer = basic_waitable_timer<chrono::system_clock>; |
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using steady_timer = basic_waitable_timer<chrono::steady_clock>; |
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using high_resolution_timer |
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= basic_waitable_timer<chrono::high_resolution_clock>; |
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|
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template<typename _Clock, typename _WaitTraits> |
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void |
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basic_waitable_timer<_Clock, _WaitTraits>::wait() |
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{ |
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_M_ex.dispatch([this] { |
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while (clock_type::now() < _M_expiry) |
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this_thread::sleep_for(traits_type::to_wait_duration(_M_expiry)); |
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}, allocator<void>{}); |
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} |
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|
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template<typename _Clock, typename _WaitTraits> |
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void |
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basic_waitable_timer<_Clock, _WaitTraits>::wait(error_code&) |
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{ |
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_M_ex.dispatch([this] { |
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while (clock_type::now() < _M_expiry) |
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this_thread::sleep_for(traits_type::to_wait_duration(_M_expiry)); |
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}, allocator<void>{}); |
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} |
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/// @} |
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|
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} // namespace v1 |
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} // namespace net |
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} // namespace experimental |
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace std |
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|
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#endif // C++14 |
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|
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#endif // _GLIBCXX_EXPERIMENTAL_TIMER |
