mirror of
https://github.com/zeromq/libzmq.git
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131 lines
3.1 KiB
C++
131 lines
3.1 KiB
C++
/*
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Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_SELECT_HPP_INCLUDED__
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#define __ZMQ_SELECT_HPP_INCLUDED__
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// poller.hpp decides which polling mechanism to use.
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#include "poller.hpp"
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#if defined ZMQ_USE_SELECT
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#include "platform.hpp"
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#include <stddef.h>
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#include <vector>
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#ifdef ZMQ_HAVE_WINDOWS
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#include <winsock2.h>
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#elif defined ZMQ_HAVE_OPENVMS
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#include <sys/types.h>
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#include <sys/time.h>
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#else
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#include <sys/select.h>
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#endif
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#include "ctx.hpp"
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#include "fd.hpp"
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#include "thread.hpp"
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#include "poller_base.hpp"
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namespace zmq
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{
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struct i_poll_events;
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// Implements socket polling mechanism using POSIX.1-2001 select()
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// function.
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class select_t : public poller_base_t
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{
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public:
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typedef fd_t handle_t;
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select_t (const ctx_t &ctx_);
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~select_t ();
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// "poller" concept.
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handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
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void rm_fd (handle_t handle_);
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void set_pollin (handle_t handle_);
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void reset_pollin (handle_t handle_);
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void set_pollout (handle_t handle_);
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void reset_pollout (handle_t handle_);
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void start ();
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void stop ();
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static int max_fds ();
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private:
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// Main worker thread routine.
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static void worker_routine (void *arg_);
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// Main event loop.
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void loop ();
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// Reference to ZMQ context.
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const ctx_t &ctx;
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struct fd_entry_t
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{
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fd_t fd;
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zmq::i_poll_events *events;
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};
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// Checks if an fd_entry_t is retired.
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static bool is_retired_fd (const fd_entry_t &entry);
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// Set of file descriptors that are used to retreive
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// information for fd_set.
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typedef std::vector <fd_entry_t> fd_set_t;
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fd_set_t fds;
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fd_set source_set_in;
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fd_set source_set_out;
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fd_set source_set_err;
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fd_set readfds;
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fd_set writefds;
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fd_set exceptfds;
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// Maximum file descriptor.
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fd_t maxfd;
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// If true, at least one file descriptor has retired.
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bool retired;
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// If true, thread is shutting down.
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bool stopping;
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// Handle of the physical thread doing the I/O work.
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thread_t worker;
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select_t (const select_t&);
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const select_t &operator = (const select_t&);
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};
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typedef select_t poller_t;
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}
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#endif
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#endif
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