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85 lines
2.5 KiB
85 lines
2.5 KiB
// |
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// detail/eventfd_select_interrupter.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 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 BOOST_ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP |
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#define BOOST_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 <boost/asio/detail/config.hpp> |
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#if defined(BOOST_ASIO_HAS_EVENTFD) |
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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 eventfd_select_interrupter |
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{ |
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public: |
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// Constructor. |
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BOOST_ASIO_DECL eventfd_select_interrupter(); |
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// Destructor. |
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BOOST_ASIO_DECL ~eventfd_select_interrupter(); |
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// Recreate the interrupter's descriptors. Used after a fork. |
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BOOST_ASIO_DECL void recreate(); |
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// Interrupt the select call. |
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BOOST_ASIO_DECL void interrupt(); |
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// Reset the select interrupt. Returns true if the call was interrupted. |
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BOOST_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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BOOST_ASIO_DECL void open_descriptors(); |
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// Close the descriptors. |
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BOOST_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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} // namespace boost |
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#include <boost/asio/detail/pop_options.hpp> |
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#if defined(BOOST_ASIO_HEADER_ONLY) |
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# include <boost/asio/detail/impl/eventfd_select_interrupter.ipp> |
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#endif // defined(BOOST_ASIO_HEADER_ONLY) |
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#endif // defined(BOOST_ASIO_HAS_EVENTFD) |
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#endif // BOOST_ASIO_DETAIL_EVENTFD_SELECT_INTERRUPTER_HPP
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