1/*
2 Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#ifndef __ZMQ_KQUEUE_HPP_INCLUDED__
31#define __ZMQ_KQUEUE_HPP_INCLUDED__
32
33// poller.hpp decides which polling mechanism to use.
34#include "poller.hpp"
35#if defined ZMQ_IOTHREAD_POLLER_USE_KQUEUE
36
37#include <vector>
38#include <unistd.h>
39
40#include "ctx.hpp"
41#include "fd.hpp"
42#include "thread.hpp"
43#include "poller_base.hpp"
44
45namespace zmq
46{
47struct i_poll_events;
48
49// Implements socket polling mechanism using the BSD-specific
50// kqueue interface.
51
52class kqueue_t : public worker_poller_base_t
53{
54 public:
55 typedef void *handle_t;
56
57 kqueue_t (const thread_ctx_t &ctx_);
58 ~kqueue_t ();
59
60 // "poller" concept.
61 handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
62 void rm_fd (handle_t handle_);
63 void set_pollin (handle_t handle_);
64 void reset_pollin (handle_t handle_);
65 void set_pollout (handle_t handle_);
66 void reset_pollout (handle_t handle_);
67 void stop ();
68
69 static int max_fds ();
70
71 private:
72 // Main event loop.
73 void loop ();
74
75 // File descriptor referring to the kernel event queue.
76 fd_t kqueue_fd;
77
78 // Adds the event to the kqueue.
79 void kevent_add (fd_t fd_, short filter_, void *udata_);
80
81 // Deletes the event from the kqueue.
82 void kevent_delete (fd_t fd_, short filter_);
83
84 struct poll_entry_t
85 {
86 fd_t fd;
87 bool flag_pollin;
88 bool flag_pollout;
89 zmq::i_poll_events *reactor;
90 };
91
92 // List of retired event sources.
93 typedef std::vector<poll_entry_t *> retired_t;
94 retired_t retired;
95
96 ZMQ_NON_COPYABLE_NOR_MOVABLE (kqueue_t)
97
98#ifdef HAVE_FORK
99 // the process that created this context. Used to detect forking.
100 pid_t pid;
101#endif
102};
103
104typedef kqueue_t poller_t;
105}
106
107#endif
108
109#endif
110