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_EPOLL_HPP_INCLUDED__
31#define __ZMQ_EPOLL_HPP_INCLUDED__
32
33// poller.hpp decides which polling mechanism to use.
34#include "poller.hpp"
35#if defined ZMQ_IOTHREAD_POLLER_USE_EPOLL
36
37#include <vector>
38
39#if defined ZMQ_HAVE_WINDOWS
40#include "../external/wepoll/wepoll.h"
41#else
42#include <sys/epoll.h>
43#endif
44
45#include "ctx.hpp"
46#include "fd.hpp"
47#include "thread.hpp"
48#include "poller_base.hpp"
49#include "mutex.hpp"
50
51namespace zmq
52{
53struct i_poll_events;
54
55// This class implements socket polling mechanism using the Linux-specific
56// epoll mechanism.
57
58class epoll_t : public worker_poller_base_t
59{
60 public:
61 typedef void *handle_t;
62
63 epoll_t (const thread_ctx_t &ctx_);
64 ~epoll_t ();
65
66 // "poller" concept.
67 handle_t add_fd (fd_t fd_, zmq::i_poll_events *events_);
68 void rm_fd (handle_t handle_);
69 void set_pollin (handle_t handle_);
70 void reset_pollin (handle_t handle_);
71 void set_pollout (handle_t handle_);
72 void reset_pollout (handle_t handle_);
73 void stop ();
74
75 static int max_fds ();
76
77 private:
78#if defined ZMQ_HAVE_WINDOWS
79 typedef HANDLE epoll_fd_t;
80 static const epoll_fd_t epoll_retired_fd;
81#else
82 typedef fd_t epoll_fd_t;
83 enum
84 {
85 epoll_retired_fd = retired_fd
86 };
87#endif
88
89 // Main event loop.
90 void loop ();
91
92 // Main epoll file descriptor
93 epoll_fd_t _epoll_fd;
94
95 struct poll_entry_t
96 {
97 fd_t fd;
98 epoll_event ev;
99 zmq::i_poll_events *events;
100 };
101
102 // List of retired event sources.
103 typedef std::vector<poll_entry_t *> retired_t;
104 retired_t _retired;
105
106 ZMQ_NON_COPYABLE_NOR_MOVABLE (epoll_t)
107};
108
109typedef epoll_t poller_t;
110}
111
112#endif
113
114#endif
115