107 lines
2.0 KiB
C++
107 lines
2.0 KiB
C++
//
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// detail/null_event.hpp
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// ~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_NULL_EVENT_HPP
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#define ASIO_DETAIL_NULL_EVENT_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class null_event
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: private noncopyable
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{
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public:
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// Constructor.
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null_event()
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{
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}
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// Destructor.
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~null_event()
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{
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}
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// Signal the event. (Retained for backward compatibility.)
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template <typename Lock>
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void signal(Lock&)
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{
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}
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// Signal all waiters.
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template <typename Lock>
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void signal_all(Lock&)
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{
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}
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// Unlock the mutex and signal one waiter.
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template <typename Lock>
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void unlock_and_signal_one(Lock&)
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{
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}
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// Unlock the mutex and signal one waiter who may destroy us.
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template <typename Lock>
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void unlock_and_signal_one_for_destruction(Lock&)
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{
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}
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// If there's a waiter, unlock the mutex and signal it.
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template <typename Lock>
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bool maybe_unlock_and_signal_one(Lock&)
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{
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return false;
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}
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// Reset the event.
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template <typename Lock>
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void clear(Lock&)
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{
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}
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// Wait for the event to become signalled.
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template <typename Lock>
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void wait(Lock&)
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{
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do_wait();
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}
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// Timed wait for the event to become signalled.
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template <typename Lock>
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bool wait_for_usec(Lock&, long usec)
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{
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do_wait_for_usec(usec);
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return true;
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}
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private:
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ASIO_DECL static void do_wait();
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ASIO_DECL static void do_wait_for_usec(long usec);
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/null_event.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // ASIO_DETAIL_NULL_EVENT_HPP
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