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//
// detail/null_event.hpp
// ~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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 ASIO_DETAIL_NULL_EVENT_HPP
#define ASIO_DETAIL_NULL_EVENT_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/push_options.hpp"
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&)
{
do_wait();
}
// Timed wait for the event to become signalled.
template <typename Lock>
bool wait_for_usec(Lock&, long usec)
{
do_wait_for_usec(usec);
return true;
}
private:
ASIO_DECL static void do_wait();
ASIO_DECL static void do_wait_for_usec(long usec);
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/detail/impl/null_event.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // ASIO_DETAIL_NULL_EVENT_HPP
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