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1 | // |
2 | // detail/null_event.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_NULL_EVENT_HPP | |
12 | #define BOOST_ASIO_DETAIL_NULL_EVENT_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | ||
20 | #if !defined(BOOST_ASIO_HAS_THREADS) | |
21 | ||
22 | #include <boost/asio/detail/noncopyable.hpp> | |
23 | ||
24 | #include <boost/asio/detail/push_options.hpp> | |
25 | ||
26 | namespace boost { | |
27 | namespace asio { | |
28 | namespace detail { | |
29 | ||
30 | class null_event | |
31 | : private noncopyable | |
32 | { | |
33 | public: | |
34 | // Constructor. | |
35 | null_event() | |
36 | { | |
37 | } | |
38 | ||
39 | // Destructor. | |
40 | ~null_event() | |
41 | { | |
42 | } | |
43 | ||
44 | // Signal the event. (Retained for backward compatibility.) | |
45 | template <typename Lock> | |
46 | void signal(Lock&) | |
47 | { | |
48 | } | |
49 | ||
50 | // Signal all waiters. | |
51 | template <typename Lock> | |
52 | void signal_all(Lock&) | |
53 | { | |
54 | } | |
55 | ||
56 | // Unlock the mutex and signal one waiter. | |
57 | template <typename Lock> | |
58 | void unlock_and_signal_one(Lock&) | |
59 | { | |
60 | } | |
61 | ||
62 | // If there's a waiter, unlock the mutex and signal it. | |
63 | template <typename Lock> | |
64 | bool maybe_unlock_and_signal_one(Lock&) | |
65 | { | |
66 | return false; | |
67 | } | |
68 | ||
69 | // Reset the event. | |
70 | template <typename Lock> | |
71 | void clear(Lock&) | |
72 | { | |
73 | } | |
74 | ||
75 | // Wait for the event to become signalled. | |
76 | template <typename Lock> | |
77 | void wait(Lock&) | |
78 | { | |
79 | } | |
80 | }; | |
81 | ||
82 | } // namespace detail | |
83 | } // namespace asio | |
84 | } // namespace boost | |
85 | ||
86 | #include <boost/asio/detail/pop_options.hpp> | |
87 | ||
88 | #endif // !defined(BOOST_ASIO_HAS_THREADS) | |
89 | ||
90 | #endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP |