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b32b8144 FG |
1 | // |
2 | // detail/impl/strand_executor_service.ipp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
1e59de90 | 5 | // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
b32b8144 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_IMPL_STRAND_EXECUTOR_SERVICE_IPP | |
12 | #define BOOST_ASIO_DETAIL_IMPL_STRAND_EXECUTOR_SERVICE_IPP | |
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 | #include <boost/asio/detail/strand_executor_service.hpp> | |
20 | ||
21 | #include <boost/asio/detail/push_options.hpp> | |
22 | ||
23 | namespace boost { | |
24 | namespace asio { | |
25 | namespace detail { | |
26 | ||
27 | strand_executor_service::strand_executor_service(execution_context& ctx) | |
28 | : execution_context_service_base<strand_executor_service>(ctx), | |
29 | mutex_(), | |
30 | salt_(0), | |
31 | impl_list_(0) | |
32 | { | |
33 | } | |
34 | ||
35 | void strand_executor_service::shutdown() | |
36 | { | |
37 | op_queue<scheduler_operation> ops; | |
38 | ||
39 | boost::asio::detail::mutex::scoped_lock lock(mutex_); | |
40 | ||
41 | strand_impl* impl = impl_list_; | |
42 | while (impl) | |
43 | { | |
11fdf7f2 TL |
44 | impl->mutex_->lock(); |
45 | impl->shutdown_ = true; | |
b32b8144 FG |
46 | ops.push(impl->waiting_queue_); |
47 | ops.push(impl->ready_queue_); | |
11fdf7f2 | 48 | impl->mutex_->unlock(); |
b32b8144 FG |
49 | impl = impl->next_; |
50 | } | |
51 | } | |
52 | ||
53 | strand_executor_service::implementation_type | |
54 | strand_executor_service::create_implementation() | |
55 | { | |
56 | implementation_type new_impl(new strand_impl); | |
57 | new_impl->locked_ = false; | |
11fdf7f2 | 58 | new_impl->shutdown_ = false; |
b32b8144 FG |
59 | |
60 | boost::asio::detail::mutex::scoped_lock lock(mutex_); | |
61 | ||
62 | // Select a mutex from the pool of shared mutexes. | |
63 | std::size_t salt = salt_++; | |
64 | std::size_t mutex_index = reinterpret_cast<std::size_t>(new_impl.get()); | |
65 | mutex_index += (reinterpret_cast<std::size_t>(new_impl.get()) >> 3); | |
66 | mutex_index ^= salt + 0x9e3779b9 + (mutex_index << 6) + (mutex_index >> 2); | |
67 | mutex_index = mutex_index % num_mutexes; | |
68 | if (!mutexes_[mutex_index].get()) | |
69 | mutexes_[mutex_index].reset(new mutex); | |
70 | new_impl->mutex_ = mutexes_[mutex_index].get(); | |
71 | ||
72 | // Insert implementation into linked list of all implementations. | |
73 | new_impl->next_ = impl_list_; | |
74 | new_impl->prev_ = 0; | |
75 | if (impl_list_) | |
76 | impl_list_->prev_ = new_impl.get(); | |
77 | impl_list_ = new_impl.get(); | |
78 | new_impl->service_ = this; | |
79 | ||
80 | return new_impl; | |
81 | } | |
82 | ||
83 | strand_executor_service::strand_impl::~strand_impl() | |
84 | { | |
85 | boost::asio::detail::mutex::scoped_lock lock(service_->mutex_); | |
86 | ||
87 | // Remove implementation from linked list of all implementations. | |
88 | if (service_->impl_list_ == this) | |
89 | service_->impl_list_ = next_; | |
90 | if (prev_) | |
91 | prev_->next_ = next_; | |
92 | if (next_) | |
93 | next_->prev_= prev_; | |
94 | } | |
95 | ||
96 | bool strand_executor_service::enqueue(const implementation_type& impl, | |
97 | scheduler_operation* op) | |
98 | { | |
99 | impl->mutex_->lock(); | |
11fdf7f2 TL |
100 | if (impl->shutdown_) |
101 | { | |
102 | impl->mutex_->unlock(); | |
103 | op->destroy(); | |
104 | return false; | |
105 | } | |
106 | else if (impl->locked_) | |
b32b8144 FG |
107 | { |
108 | // Some other function already holds the strand lock. Enqueue for later. | |
109 | impl->waiting_queue_.push(op); | |
110 | impl->mutex_->unlock(); | |
111 | return false; | |
112 | } | |
113 | else | |
114 | { | |
115 | // The function is acquiring the strand lock and so is responsible for | |
116 | // scheduling the strand. | |
117 | impl->locked_ = true; | |
118 | impl->mutex_->unlock(); | |
119 | impl->ready_queue_.push(op); | |
120 | return true; | |
121 | } | |
122 | } | |
123 | ||
124 | bool strand_executor_service::running_in_this_thread( | |
125 | const implementation_type& impl) | |
126 | { | |
127 | return !!call_stack<strand_impl>::contains(impl.get()); | |
128 | } | |
129 | ||
1e59de90 TL |
130 | bool strand_executor_service::push_waiting_to_ready(implementation_type& impl) |
131 | { | |
132 | impl->mutex_->lock(); | |
133 | impl->ready_queue_.push(impl->waiting_queue_); | |
134 | bool more_handlers = impl->locked_ = !impl->ready_queue_.empty(); | |
135 | impl->mutex_->unlock(); | |
136 | return more_handlers; | |
137 | } | |
138 | ||
139 | void strand_executor_service::run_ready_handlers(implementation_type& impl) | |
140 | { | |
141 | // Indicate that this strand is executing on the current thread. | |
142 | call_stack<strand_impl>::context ctx(impl.get()); | |
143 | ||
144 | // Run all ready handlers. No lock is required since the ready queue is | |
145 | // accessed only within the strand. | |
146 | boost::system::error_code ec; | |
147 | while (scheduler_operation* o = impl->ready_queue_.front()) | |
148 | { | |
149 | impl->ready_queue_.pop(); | |
150 | o->complete(impl.get(), ec, 0); | |
151 | } | |
152 | } | |
153 | ||
b32b8144 FG |
154 | } // namespace detail |
155 | } // namespace asio | |
156 | } // namespace boost | |
157 | ||
158 | #include <boost/asio/detail/pop_options.hpp> | |
159 | ||
160 | #endif // BOOST_ASIO_DETAIL_IMPL_STRAND_EXECUTOR_SERVICE_IPP |