// // detail/null_event.hpp // ~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2014 Christopher M. Kohlhoff (chris at kohlhoff dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #ifndef BOOST_ASIO_DETAIL_NULL_EVENT_HPP #define BOOST_ASIO_DETAIL_NULL_EVENT_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #if !defined(BOOST_ASIO_HAS_THREADS) #include <boost/asio/detail/noncopyable.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace detail { class null_event : private noncopyable { public: // Constructor. null_event() { } // Destructor. ~null_event() { } // Signal the event. (Retained for backward compatibility.) template <typename Lock> void signal(Lock&) { } // Signal all waiters. template <typename Lock> void signal_all(Lock&) { } // Unlock the mutex and signal one waiter. template <typename Lock> void unlock_and_signal_one(Lock&) { } // If there's a waiter, unlock the mutex and signal it. template <typename Lock> bool maybe_unlock_and_signal_one(Lock&) { return false; } // Reset the event. template <typename Lock> void clear(Lock&) { } // Wait for the event to become signalled. template <typename Lock> void wait(Lock&) { } }; } // namespace detail } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // !defined(BOOST_ASIO_HAS_THREADS) #endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP