mirror of https://github.com/axmolengine/axmol.git
132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
//////////////////////////////////////////////////////////////////////////////////////////
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// A multi-platform support c++11 library with focus on asynchronous socket I/O for any
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// client application.
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//////////////////////////////////////////////////////////////////////////////////////////
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//
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// detail/socket_select_interrupter.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2012-2021 halx99 (halx99 at live dot com)
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// Copyright (c) 2003-2020 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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// see also: https://github.com/chriskohlhoff/asio
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//
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#ifndef YASIO__SOCKET_SELECT_INTERRUPTER_HPP
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#define YASIO__SOCKET_SELECT_INTERRUPTER_HPP
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#include "yasio/xxsocket.hpp"
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namespace yasio
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{
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namespace inet
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{
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class socket_select_interrupter
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{
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public:
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// Constructor.
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inline socket_select_interrupter() { open_descriptors(); }
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// Destructor.
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inline ~socket_select_interrupter() { close_descriptors(); }
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// Recreate the interrupter's descriptors. Used after a fork.
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inline void recreate()
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{
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close_descriptors();
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write_descriptor_ = invalid_socket;
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read_descriptor_ = invalid_socket;
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open_descriptors();
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}
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// Interrupt the select call.
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inline void interrupt() { xxsocket::send(write_descriptor_, "\0", 1); }
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// Reset the select interrupter. Returns true if the reset was successful.
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inline bool reset()
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{
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char data[1024];
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for (;;)
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{
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int bytes_read = xxsocket::recv(read_descriptor_, data, sizeof(data), 0);
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if (bytes_read == sizeof(data))
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continue;
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if (bytes_read > 0)
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return true;
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if (bytes_read == 0)
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return false;
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int ec = xxsocket::get_last_errno();
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if (ec == EINTR)
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continue;
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return (ec == EWOULDBLOCK || ec == EAGAIN);
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}
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}
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// Get the read descriptor to be passed to select.
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socket_native_type read_descriptor() const { return read_descriptor_; }
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private:
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// Open the descriptors. Throws on error.
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inline void open_descriptors()
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{
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xxsocket acceptor(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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acceptor.set_optval(SOL_SOCKET, SO_REUSEADDR, 1);
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int error = 0;
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ip::endpoint ep(INADDR_LOOPBACK);
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error = acceptor.bind(ep);
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ep = acceptor.local_endpoint();
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// Some broken firewalls on Windows will intermittently cause getsockname to
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// return 0.0.0.0 when the socket is actually bound to 127.0.0.1. We
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// explicitly specify the target address here to work around this problem.
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if (INADDR_ANY == ep.addr_v4())
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ep.addr_v4(INADDR_LOOPBACK);
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error = acceptor.listen();
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xxsocket client(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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error = client.connect(ep);
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auto server = acceptor.accept();
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client.set_nonblocking(true);
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client.set_optval(IPPROTO_TCP, TCP_NODELAY, 1);
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server.set_nonblocking(true);
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server.set_optval(IPPROTO_TCP, TCP_NODELAY, 1);
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read_descriptor_ = server.release_handle();
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write_descriptor_ = client.release_handle();
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}
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// Close the descriptors.
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inline void close_descriptors()
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{
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if (read_descriptor_ != invalid_socket)
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::closesocket(read_descriptor_);
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if (write_descriptor_ != invalid_socket)
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::closesocket(write_descriptor_);
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}
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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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// byte will be written on the other end of the connection and this
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// descriptor will become readable.
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socket_native_type read_descriptor_;
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// The write end of a connection used to interrupt the select call. A single
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// byte may be written to this to wake up the select which is waiting for the
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// other end to become readable.
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socket_native_type write_descriptor_;
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};
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} // namespace inet
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} // namespace yasio
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#endif // YASIO__SOCKET_SELECT_INTERRUPTER_HPP
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