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1 | // |
2 | // detail/win_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_WIN_EVENT_HPP | |
12 | #define BOOST_ASIO_DETAIL_WIN_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_WINDOWS) | |
21 | ||
22 | #include <boost/asio/detail/assert.hpp> | |
23 | #include <boost/asio/detail/noncopyable.hpp> | |
24 | #include <boost/asio/detail/socket_types.hpp> | |
25 | ||
26 | #include <boost/asio/detail/push_options.hpp> | |
27 | ||
28 | namespace boost { | |
29 | namespace asio { | |
30 | namespace detail { | |
31 | ||
32 | class win_event | |
33 | : private noncopyable | |
34 | { | |
35 | public: | |
36 | // Constructor. | |
37 | BOOST_ASIO_DECL win_event(); | |
38 | ||
39 | // Destructor. | |
40 | BOOST_ASIO_DECL ~win_event(); | |
41 | ||
42 | // Signal the event. (Retained for backward compatibility.) | |
43 | template <typename Lock> | |
44 | void signal(Lock& lock) | |
45 | { | |
46 | this->signal_all(lock); | |
47 | } | |
48 | ||
49 | // Signal all waiters. | |
50 | template <typename Lock> | |
51 | void signal_all(Lock& lock) | |
52 | { | |
53 | BOOST_ASIO_ASSERT(lock.locked()); | |
54 | (void)lock; | |
55 | state_ |= 1; | |
56 | ::SetEvent(events_[0]); | |
57 | } | |
58 | ||
59 | // Unlock the mutex and signal one waiter. | |
60 | template <typename Lock> | |
61 | void unlock_and_signal_one(Lock& lock) | |
62 | { | |
63 | BOOST_ASIO_ASSERT(lock.locked()); | |
64 | state_ |= 1; | |
65 | bool have_waiters = (state_ > 1); | |
66 | lock.unlock(); | |
67 | if (have_waiters) | |
68 | ::SetEvent(events_[1]); | |
69 | } | |
70 | ||
71 | // If there's a waiter, unlock the mutex and signal it. | |
72 | template <typename Lock> | |
73 | bool maybe_unlock_and_signal_one(Lock& lock) | |
74 | { | |
75 | BOOST_ASIO_ASSERT(lock.locked()); | |
76 | state_ |= 1; | |
77 | if (state_ > 1) | |
78 | { | |
79 | lock.unlock(); | |
80 | ::SetEvent(events_[1]); | |
81 | return true; | |
82 | } | |
83 | return false; | |
84 | } | |
85 | ||
86 | // Reset the event. | |
87 | template <typename Lock> | |
88 | void clear(Lock& lock) | |
89 | { | |
90 | BOOST_ASIO_ASSERT(lock.locked()); | |
91 | (void)lock; | |
92 | ::ResetEvent(events_[0]); | |
93 | state_ &= ~std::size_t(1); | |
94 | } | |
95 | ||
96 | // Wait for the event to become signalled. | |
97 | template <typename Lock> | |
98 | void wait(Lock& lock) | |
99 | { | |
100 | BOOST_ASIO_ASSERT(lock.locked()); | |
101 | while ((state_ & 1) == 0) | |
102 | { | |
103 | state_ += 2; | |
104 | lock.unlock(); | |
105 | #if defined(BOOST_ASIO_WINDOWS_APP) | |
106 | ::WaitForMultipleObjectsEx(2, events_, false, INFINITE, false); | |
107 | #else // defined(BOOST_ASIO_WINDOWS_APP) | |
108 | ::WaitForMultipleObjects(2, events_, false, INFINITE); | |
109 | #endif // defined(BOOST_ASIO_WINDOWS_APP) | |
110 | lock.lock(); | |
111 | state_ -= 2; | |
112 | } | |
113 | } | |
114 | ||
115 | private: | |
116 | HANDLE events_[2]; | |
117 | std::size_t state_; | |
118 | }; | |
119 | ||
120 | } // namespace detail | |
121 | } // namespace asio | |
122 | } // namespace boost | |
123 | ||
124 | #include <boost/asio/detail/pop_options.hpp> | |
125 | ||
126 | #if defined(BOOST_ASIO_HEADER_ONLY) | |
127 | # include <boost/asio/detail/impl/win_event.ipp> | |
128 | #endif // defined(BOOST_ASIO_HEADER_ONLY) | |
129 | ||
130 | #endif // defined(BOOST_ASIO_WINDOWS) | |
131 | ||
132 | #endif // BOOST_ASIO_DETAIL_WIN_EVENT_HPP |