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