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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq 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 (LGPL) as published
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by 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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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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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_POLL_HPP_INCLUDED__
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#define __ZMQ_POLL_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_IOTHREAD_POLLER_USE_POLL
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#if defined ZMQ_HAVE_WINDOWS
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#error \
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"poll is broken on Windows for the purpose of the I/O thread poller, use select instead; "\
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"see https://github.com/zeromq/libzmq/issues/3107"
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#endif
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#include <poll.h>
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#include <stddef.h>
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#include <vector>
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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 the POSIX.1-2001
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// poll() system call.
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class poll_t ZMQ_FINAL : public worker_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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poll_t (const thread_ctx_t &ctx_);
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~poll_t ();
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// "poller" concept.
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// These methods may only be called from an event callback; add_fd may also be called before start.
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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 stop ();
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static int max_fds ();
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private:
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// Main event loop.
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void loop () ZMQ_FINAL;
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void cleanup_retired ();
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struct fd_entry_t
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{
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fd_t index;
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zmq::i_poll_events *events;
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};
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// This table stores data for registered descriptors.
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typedef std::vector<fd_entry_t> fd_table_t;
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fd_table_t fd_table;
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// Pollset to pass to the poll function.
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typedef std::vector<pollfd> pollset_t;
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pollset_t pollset;
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// If true, there's at least one retired event source.
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bool retired;
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ZMQ_NON_COPYABLE_NOR_MOVABLE (poll_t)
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};
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typedef poll_t poller_t;
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}
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#endif
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#endif
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