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authorMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
committerMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
commit686958a9db9b140c9665af8fd001e7032a37a46e (patch)
treec0f1a7b4f7d1ffc12ce54271da73edefee18e5b6 /src/select.hpp
initial debian package import
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+/*
+ Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ 0MQ is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_SELECT_HPP_INCLUDED__
+#define __ZMQ_SELECT_HPP_INCLUDED__
+
+// poller.hpp decides which polling mechanism to use.
+#include "poller.hpp"
+#if defined ZMQ_USE_SELECT
+
+#include "platform.hpp"
+
+#include <stddef.h>
+#include <vector>
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "winsock2.h"
+#elif defined ZMQ_HAVE_OPENVMS
+#include <sys/types.h>
+#include <sys/time.h>
+#else
+#include <sys/select.h>
+#endif
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "poller_base.hpp"
+
+namespace zmq
+{
+
+ struct i_poll_events;
+
+ // Implements socket polling mechanism using POSIX.1-2001 select()
+ // function.
+
+ class select_t : public poller_base_t
+ {
+ public:
+
+ typedef fd_t handle_t;
+
+ select_t ();
+ ~select_t ();
+
+ // "poller" concept.
+ handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
+ void rm_fd (handle_t handle_);
+ void set_pollin (handle_t handle_);
+ void reset_pollin (handle_t handle_);
+ void set_pollout (handle_t handle_);
+ void reset_pollout (handle_t handle_);
+ void start ();
+ void stop ();
+
+ static int max_fds ();
+
+ private:
+
+ // Main worker thread routine.
+ static void worker_routine (void *arg_);
+
+ // Main event loop.
+ void loop ();
+
+ struct fd_entry_t
+ {
+ fd_t fd;
+ zmq::i_poll_events *events;
+ };
+
+ // Checks if an fd_entry_t is retired.
+ static bool is_retired_fd (const fd_entry_t &entry);
+
+ // Set of file descriptors that are used to retreive
+ // information for fd_set.
+ typedef std::vector <fd_entry_t> fd_set_t;
+ fd_set_t fds;
+
+ fd_set source_set_in;
+ fd_set source_set_out;
+ fd_set source_set_err;
+
+ fd_set readfds;
+ fd_set writefds;
+ fd_set exceptfds;
+
+ // Maximum file descriptor.
+ fd_t maxfd;
+
+ // If true, at least one file descriptor has retired.
+ bool retired;
+
+ // If true, thread is shutting down.
+ bool stopping;
+
+ // Handle of the physical thread doing the I/O work.
+ thread_t worker;
+
+ select_t (const select_t&);
+ const select_t &operator = (const select_t&);
+ };
+
+ typedef select_t poller_t;
+
+}
+
+#endif
+
+#endif