//
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// detail/conditionally_enabled_event.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 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 BOOST_ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
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#define BOOST_ASIO_DETAIL_CONDITIONALLY_ENABLED_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 <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/conditionally_enabled_mutex.hpp>
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#include <boost/asio/detail/event.hpp>
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/null_event.hpp>
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#include <boost/asio/detail/scoped_lock.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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// Mutex adapter used to conditionally enable or disable locking.
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class conditionally_enabled_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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conditionally_enabled_event()
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{
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}
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// Destructor.
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~conditionally_enabled_event()
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{
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}
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// Signal the event. (Retained for backward compatibility.)
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void signal(conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.signal(lock);
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}
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// Signal all waiters.
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void signal_all(conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.signal_all(lock);
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}
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// Unlock the mutex and signal one waiter.
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void unlock_and_signal_one(
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conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.unlock_and_signal_one(lock);
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}
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// Unlock the mutex and signal one waiter who may destroy us.
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void unlock_and_signal_one_for_destruction(
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conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.unlock_and_signal_one(lock);
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}
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// If there's a waiter, unlock the mutex and signal it.
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bool maybe_unlock_and_signal_one(
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conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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return event_.maybe_unlock_and_signal_one(lock);
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else
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return false;
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}
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// Reset the event.
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void clear(conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.clear(lock);
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}
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// Wait for the event to become signalled.
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void wait(conditionally_enabled_mutex::scoped_lock& lock)
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{
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if (lock.mutex_.enabled_)
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event_.wait(lock);
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else
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null_event().wait(lock);
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}
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// Timed wait for the event to become signalled.
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bool wait_for_usec(
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conditionally_enabled_mutex::scoped_lock& lock, long usec)
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{
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if (lock.mutex_.enabled_)
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return event_.wait_for_usec(lock, usec);
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else
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return null_event().wait_for_usec(lock, usec);
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}
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private:
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boost::asio::detail::event event_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
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