1 // 2 // detail/pipe_select_interrupter.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2015 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 ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP 12 #define ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP 13 14 15 #include "asio/detail/config.hpp" 16 17 18 #include "asio/detail/push_options.hpp" 19 20 namespace asio { 21 namespace detail { 22 23 class pipe_select_interrupter 24 { 25 public: 26 // Constructor. 27 ASIO_DECL pipe_select_interrupter(); 28 29 // Destructor. 30 ASIO_DECL ~pipe_select_interrupter(); 31 32 // Recreate the interrupter's descriptors. Used after a fork. 33 ASIO_DECL void recreate(); 34 35 // Interrupt the select call. 36 ASIO_DECL void interrupt(); 37 38 // Reset the select interrupt. Returns true if the call was interrupted. 39 ASIO_DECL bool reset(); 40 41 // Get the read descriptor to be passed to select. 42 int read_descriptor() const 43 { 44 return read_descriptor_; 45 } 46 47 private: 48 // Open the descriptors. Throws on error. 49 ASIO_DECL void open_descriptors(); 50 51 // Close the descriptors. 52 ASIO_DECL void close_descriptors(); 53 54 // The read end of a connection used to interrupt the select call. This file 55 // descriptor is passed to select such that when it is time to stop, a single 56 // byte will be written on the other end of the connection and this 57 // descriptor will become readable. 58 int read_descriptor_; 59 60 // The write end of a connection used to interrupt the select call. A single 61 // byte may be written to this to wake up the select which is waiting for the 62 // other end to become readable. 63 int write_descriptor_; 64 }; 65 66 } // namespace detail 67 } // namespace asio 68 69 #include "asio/detail/pop_options.hpp" 70 71 # include "asio/detail/impl/pipe_select_interrupter.ipp" 72 73 74 #endif // ASIO_DETAIL_PIPE_SELECT_INTERRUPTER_HPP 75
