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7c673cae FG |
1 | // |
2 | // detail/win_event.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
f67539c2 | 5 | // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
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 | ||
20effc67 | 22 | #include <cstddef> |
7c673cae FG |
23 | #include <boost/asio/detail/assert.hpp> |
24 | #include <boost/asio/detail/noncopyable.hpp> | |
25 | #include <boost/asio/detail/socket_types.hpp> | |
26 | ||
27 | #include <boost/asio/detail/push_options.hpp> | |
28 | ||
29 | namespace boost { | |
30 | namespace asio { | |
31 | namespace detail { | |
32 | ||
33 | class win_event | |
34 | : private noncopyable | |
35 | { | |
36 | public: | |
37 | // Constructor. | |
38 | BOOST_ASIO_DECL win_event(); | |
39 | ||
40 | // Destructor. | |
41 | BOOST_ASIO_DECL ~win_event(); | |
42 | ||
43 | // Signal the event. (Retained for backward compatibility.) | |
44 | template <typename Lock> | |
45 | void signal(Lock& lock) | |
46 | { | |
47 | this->signal_all(lock); | |
48 | } | |
49 | ||
50 | // Signal all waiters. | |
51 | template <typename Lock> | |
52 | void signal_all(Lock& lock) | |
53 | { | |
54 | BOOST_ASIO_ASSERT(lock.locked()); | |
55 | (void)lock; | |
56 | state_ |= 1; | |
57 | ::SetEvent(events_[0]); | |
58 | } | |
59 | ||
60 | // Unlock the mutex and signal one waiter. | |
61 | template <typename Lock> | |
62 | void unlock_and_signal_one(Lock& lock) | |
63 | { | |
64 | BOOST_ASIO_ASSERT(lock.locked()); | |
65 | state_ |= 1; | |
66 | bool have_waiters = (state_ > 1); | |
67 | lock.unlock(); | |
68 | if (have_waiters) | |
69 | ::SetEvent(events_[1]); | |
70 | } | |
71 | ||
20effc67 TL |
72 | // Unlock the mutex and signal one waiter who may destroy us. |
73 | template <typename Lock> | |
74 | void unlock_and_signal_one_for_destruction(Lock& lock) | |
75 | { | |
76 | BOOST_ASIO_ASSERT(lock.locked()); | |
77 | state_ |= 1; | |
78 | bool have_waiters = (state_ > 1); | |
79 | if (have_waiters) | |
80 | ::SetEvent(events_[1]); | |
81 | lock.unlock(); | |
82 | } | |
83 | ||
7c673cae FG |
84 | // If there's a waiter, unlock the mutex and signal it. |
85 | template <typename Lock> | |
86 | bool maybe_unlock_and_signal_one(Lock& lock) | |
87 | { | |
88 | BOOST_ASIO_ASSERT(lock.locked()); | |
89 | state_ |= 1; | |
90 | if (state_ > 1) | |
91 | { | |
92 | lock.unlock(); | |
93 | ::SetEvent(events_[1]); | |
94 | return true; | |
95 | } | |
96 | return false; | |
97 | } | |
98 | ||
99 | // Reset the event. | |
100 | template <typename Lock> | |
101 | void clear(Lock& lock) | |
102 | { | |
103 | BOOST_ASIO_ASSERT(lock.locked()); | |
104 | (void)lock; | |
105 | ::ResetEvent(events_[0]); | |
106 | state_ &= ~std::size_t(1); | |
107 | } | |
108 | ||
109 | // Wait for the event to become signalled. | |
110 | template <typename Lock> | |
111 | void wait(Lock& lock) | |
112 | { | |
113 | BOOST_ASIO_ASSERT(lock.locked()); | |
114 | while ((state_ & 1) == 0) | |
115 | { | |
116 | state_ += 2; | |
117 | lock.unlock(); | |
118 | #if defined(BOOST_ASIO_WINDOWS_APP) | |
119 | ::WaitForMultipleObjectsEx(2, events_, false, INFINITE, false); | |
120 | #else // defined(BOOST_ASIO_WINDOWS_APP) | |
121 | ::WaitForMultipleObjects(2, events_, false, INFINITE); | |
122 | #endif // defined(BOOST_ASIO_WINDOWS_APP) | |
123 | lock.lock(); | |
124 | state_ -= 2; | |
125 | } | |
126 | } | |
127 | ||
b32b8144 FG |
128 | // Timed wait for the event to become signalled. |
129 | template <typename Lock> | |
130 | bool wait_for_usec(Lock& lock, long usec) | |
131 | { | |
132 | BOOST_ASIO_ASSERT(lock.locked()); | |
133 | if ((state_ & 1) == 0) | |
134 | { | |
135 | state_ += 2; | |
136 | lock.unlock(); | |
137 | DWORD msec = usec > 0 ? (usec < 1000 ? 1 : usec / 1000) : 0; | |
138 | #if defined(BOOST_ASIO_WINDOWS_APP) | |
139 | ::WaitForMultipleObjectsEx(2, events_, false, msec, false); | |
140 | #else // defined(BOOST_ASIO_WINDOWS_APP) | |
141 | ::WaitForMultipleObjects(2, events_, false, msec); | |
142 | #endif // defined(BOOST_ASIO_WINDOWS_APP) | |
143 | lock.lock(); | |
144 | state_ -= 2; | |
145 | } | |
146 | return (state_ & 1) != 0; | |
147 | } | |
148 | ||
7c673cae FG |
149 | private: |
150 | HANDLE events_[2]; | |
151 | std::size_t state_; | |
152 | }; | |
153 | ||
154 | } // namespace detail | |
155 | } // namespace asio | |
156 | } // namespace boost | |
157 | ||
158 | #include <boost/asio/detail/pop_options.hpp> | |
159 | ||
160 | #if defined(BOOST_ASIO_HEADER_ONLY) | |
161 | # include <boost/asio/detail/impl/win_event.ipp> | |
162 | #endif // defined(BOOST_ASIO_HEADER_ONLY) | |
163 | ||
164 | #endif // defined(BOOST_ASIO_WINDOWS) | |
165 | ||
166 | #endif // BOOST_ASIO_DETAIL_WIN_EVENT_HPP |