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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_KQUEUE_HPP_INCLUDED__
+#define __ZMQ_KQUEUE_HPP_INCLUDED__
+
+//  poller.hpp decides which polling mechanism to use.
+#include "poller.hpp"
+#if defined ZMQ_USE_KQUEUE
+
+#include <vector>
+#include <unistd.h>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "poller_base.hpp"
+
+namespace zmq
+{
+
+    struct i_poll_events;
+
+    //  Implements socket polling mechanism using the BSD-specific
+    //  kqueue interface.
+
+    class kqueue_t : public poller_base_t
+    {
+    public:
+
+        typedef void* handle_t;
+
+        kqueue_t ();
+        ~kqueue_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 ();
+
+        //  File descriptor referring to the kernel event queue.
+        fd_t kqueue_fd;
+
+        //  Adds the event to the kqueue.
+        void kevent_add (fd_t fd_, short filter_, void *udata_);
+
+        //  Deletes the event from the kqueue.
+        void kevent_delete (fd_t fd_, short filter_);
+
+        struct poll_entry_t
+        {
+            fd_t fd;
+            bool flag_pollin;
+            bool flag_pollout;
+            zmq::i_poll_events *reactor;
+        };
+
+        //  List of retired event sources.
+        typedef std::vector <poll_entry_t*> retired_t;
+        retired_t retired;
+
+        //  If true, thread is in the process of shutting down.
+        bool stopping;
+
+        //  Handle of the physical thread doing the I/O work.
+        thread_t worker;
+
+        kqueue_t (const kqueue_t&);
+        const kqueue_t &operator = (const kqueue_t&);
+
+#ifdef HAVE_FORK
+        // the process that created this context. Used to detect forking.
+        pid_t pid;
+#endif
+    };
+
+    typedef kqueue_t poller_t;
+
+}
+
+#endif
+
+#endif