84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
//
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// detail/eventfd_select_interrupter.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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// Copyright (c) 2008 Roelof Naude (roelof.naude at gmail 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 ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
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#define ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_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 "asio/detail/config.hpp"
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#if defined(ASIO_HAS_EVENTFD)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class eventfd_select_interrupter
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{
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public:
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// Constructor.
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ASIO_DECL eventfd_select_interrupter();
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// Destructor.
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ASIO_DECL ~eventfd_select_interrupter();
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// Recreate the interrupter's descriptors. Used after a fork.
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ASIO_DECL void recreate();
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// Interrupt the select call.
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ASIO_DECL void interrupt();
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// Reset the select interrupter. Returns true if the reset was successful.
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ASIO_DECL bool reset();
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// Get the read descriptor to be passed to select.
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int read_descriptor() const
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{
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return read_descriptor_;
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}
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private:
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// Open the descriptors. Throws on error.
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ASIO_DECL void open_descriptors();
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// Close the descriptors.
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ASIO_DECL void close_descriptors();
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// The read end of a connection used to interrupt the select call. This file
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// descriptor is passed to select such that when it is time to stop, a single
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// 64bit value will be written on the other end of the connection and this
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// descriptor will become readable.
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int read_descriptor_;
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// The write end of a connection used to interrupt the select call. A single
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// 64bit non-zero value may be written to this to wake up the select which is
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// waiting for the other end to become readable. This descriptor will only
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// differ from the read descriptor when a pipe is used.
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int write_descriptor_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/eventfd_select_interrupter.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // defined(ASIO_HAS_EVENTFD)
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#endif // ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
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