Chris@16: //
Chris@16: // detail/null_event.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_DETAIL_NULL_EVENT_HPP
Chris@16: #define BOOST_ASIO_DETAIL_NULL_EVENT_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/detail/config.hpp>
Chris@16: 
Chris@16: #if !defined(BOOST_ASIO_HAS_THREADS)
Chris@16: 
Chris@16: #include <boost/asio/detail/noncopyable.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: namespace detail {
Chris@16: 
Chris@16: class null_event
Chris@16:   : private noncopyable
Chris@16: {
Chris@16: public:
Chris@16:   // Constructor.
Chris@16:   null_event()
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@16:   // Destructor.
Chris@16:   ~null_event()
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@101:   // Signal the event. (Retained for backward compatibility.)
Chris@16:   template <typename Lock>
Chris@16:   void signal(Lock&)
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@101:   // Signal all waiters.
Chris@16:   template <typename Lock>
Chris@101:   void signal_all(Lock&)
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@101:   // Unlock the mutex and signal one waiter.
Chris@101:   template <typename Lock>
Chris@101:   void unlock_and_signal_one(Lock&)
Chris@101:   {
Chris@101:   }
Chris@101: 
Chris@101:   // If there's a waiter, unlock the mutex and signal it.
Chris@101:   template <typename Lock>
Chris@101:   bool maybe_unlock_and_signal_one(Lock&)
Chris@101:   {
Chris@101:     return false;
Chris@101:   }
Chris@101: 
Chris@16:   // Reset the event.
Chris@16:   template <typename Lock>
Chris@16:   void clear(Lock&)
Chris@16:   {
Chris@16:   }
Chris@16: 
Chris@16:   // Wait for the event to become signalled.
Chris@16:   template <typename Lock>
Chris@16:   void wait(Lock&)
Chris@16:   {
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // !defined(BOOST_ASIO_HAS_THREADS)
Chris@16: 
Chris@16: #endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP