130 lines
2.8 KiB
C++
130 lines
2.8 KiB
C++
//
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// detail/std_event.hpp
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// ~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2013 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_STD_EVENT_HPP
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#define BOOST_ASIO_DETAIL_STD_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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#if defined(BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR)
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#include <chrono>
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#include <condition_variable>
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#include <boost/asio/detail/assert.hpp>
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#include <boost/asio/detail/noncopyable.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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class std_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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std_event()
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: signalled_(false)
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{
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}
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// Destructor.
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~std_event()
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{
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}
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// Signal the event.
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template <typename Lock>
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void signal(Lock& lock)
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{
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BOOST_ASIO_ASSERT(lock.locked());
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(void)lock;
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signalled_ = true;
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cond_.notify_one();
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}
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// Signal the event and unlock the mutex.
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template <typename Lock>
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void signal_and_unlock(Lock& lock)
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{
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BOOST_ASIO_ASSERT(lock.locked());
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signalled_ = true;
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lock.unlock();
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cond_.notify_one();
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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& lock)
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{
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BOOST_ASIO_ASSERT(lock.locked());
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(void)lock;
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signalled_ = false;
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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& lock)
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{
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BOOST_ASIO_ASSERT(lock.locked());
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unique_lock_adapter u_lock(lock);
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while (!signalled_)
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cond_.wait(u_lock.unique_lock_);
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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& lock, long usec)
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{
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BOOST_ASIO_ASSERT(lock.locked());
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unique_lock_adapter u_lock(lock);
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if (!signalled_)
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cond_.wait_for(u_lock.unique_lock_, std::chrono::microseconds(usec));
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return signalled_;
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}
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private:
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// Helper class to temporarily adapt a scoped_lock into a unique_lock so that
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// it can be passed to std::condition_variable::wait().
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struct unique_lock_adapter
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{
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template <typename Lock>
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explicit unique_lock_adapter(Lock& lock)
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: unique_lock_(lock.mutex().mutex_, std::adopt_lock)
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{
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}
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~unique_lock_adapter()
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{
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unique_lock_.release();
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}
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std::unique_lock<std::mutex> unique_lock_;
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};
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std::condition_variable cond_;
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bool signalled_;
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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 // defined(BOOST_ASIO_HAS_STD_MUTEX_AND_CONDVAR)
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#endif // BOOST_ASIO_DETAIL_STD_EVENT_HPP
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