ceph/src/boost/libs/asio/include/boost/asio/detail/pipe_select_interrupter.hpp

   1 //
   2 // detail/pipe_select_interrupter.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP
  12 #define BOOST_ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if !defined(BOOST_ASIO_WINDOWS)
  21 #if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  22 #if !defined(__CYGWIN__)
  23 #if !defined(__SYMBIAN32__)
  24 #if !defined(BOOST_ASIO_HAS_EVENTFD)
  25
  26 #include <boost/asio/detail/push_options.hpp>
  27
  28 namespace boost {
  29 namespace asio {
  30 namespace detail {
  31
  32 class pipe_select_interrupter
  33 {
  34 public:
  35   // Constructor.
  36   BOOST_ASIO_DECL pipe_select_interrupter();
  37
  38   // Destructor.
  39   BOOST_ASIO_DECL ~pipe_select_interrupter();
  40
  41   // Recreate the interrupter's descriptors. Used after a fork.
  42   BOOST_ASIO_DECL void recreate();
  43
  44   // Interrupt the select call.
  45   BOOST_ASIO_DECL void interrupt();
  46
  47   // Reset the select interrupt. Returns true if the call was interrupted.
  48   BOOST_ASIO_DECL bool reset();
  49
  50   // Get the read descriptor to be passed to select.
  51   int read_descriptor() const
  52   {
  53     return read_descriptor_;
  54   }
  55
  56 private:
  57   // Open the descriptors. Throws on error.
  58   BOOST_ASIO_DECL void open_descriptors();
  59
  60   // Close the descriptors.
  61   BOOST_ASIO_DECL void close_descriptors();
  62
  63   // The read end of a connection used to interrupt the select call. This file
  64   // descriptor is passed to select such that when it is time to stop, a single
  65   // byte will be written on the other end of the connection and this
  66   // descriptor will become readable.
  67   int read_descriptor_;
  68
  69   // The write end of a connection used to interrupt the select call. A single
  70   // byte may be written to this to wake up the select which is waiting for the
  71   // other end to become readable.
  72   int write_descriptor_;
  73 };
  74
  75 } // namespace detail
  76 } // namespace asio
  77 } // namespace boost
  78
  79 #include <boost/asio/detail/pop_options.hpp>
  80
  81 #if defined(BOOST_ASIO_HEADER_ONLY)
  82 # include <boost/asio/detail/impl/pipe_select_interrupter.ipp>
  83 #endif // defined(BOOST_ASIO_HEADER_ONLY)
  84
  85 #endif // !defined(BOOST_ASIO_HAS_EVENTFD)
  86 #endif // !defined(__SYMBIAN32__)
  87 #endif // !defined(__CYGWIN__)
  88 #endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  89 #endif // !defined(BOOST_ASIO_WINDOWS)
  90
  91 #endif // BOOST_ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP