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1 | // | |
2 | // detail/thread_group.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2022 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_THREAD_GROUP_HPP | |
12 | #define BOOST_ASIO_DETAIL_THREAD_GROUP_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 | #include <boost/asio/detail/scoped_ptr.hpp> | |
20 | #include <boost/asio/detail/thread.hpp> | |
21 | ||
22 | #include <boost/asio/detail/push_options.hpp> | |
23 | ||
24 | namespace boost { | |
25 | namespace asio { | |
26 | namespace detail { | |
27 | ||
28 | class thread_group | |
29 | { | |
30 | public: | |
31 | // Constructor initialises an empty thread group. | |
32 | thread_group() | |
33 | : first_(0) | |
34 | { | |
35 | } | |
36 | ||
37 | // Destructor joins any remaining threads in the group. | |
38 | ~thread_group() | |
39 | { | |
40 | join(); | |
41 | } | |
42 | ||
43 | // Create a new thread in the group. | |
44 | template <typename Function> | |
45 | void create_thread(Function f) | |
46 | { | |
47 | first_ = new item(f, first_); | |
48 | } | |
49 | ||
50 | // Create new threads in the group. | |
51 | template <typename Function> | |
52 | void create_threads(Function f, std::size_t num_threads) | |
53 | { | |
54 | for (std::size_t i = 0; i < num_threads; ++i) | |
55 | create_thread(f); | |
56 | } | |
57 | ||
58 | // Wait for all threads in the group to exit. | |
59 | void join() | |
60 | { | |
61 | while (first_) | |
62 | { | |
63 | first_->thread_.join(); | |
64 | item* tmp = first_; | |
65 | first_ = first_->next_; | |
66 | delete tmp; | |
67 | } | |
68 | } | |
69 | ||
70 | // Test whether the group is empty. | |
71 | bool empty() const | |
72 | { | |
73 | return first_ == 0; | |
74 | } | |
75 | ||
76 | private: | |
77 | // Structure used to track a single thread in the group. | |
78 | struct item | |
79 | { | |
80 | template <typename Function> | |
81 | explicit item(Function f, item* next) | |
82 | : thread_(f), | |
83 | next_(next) | |
84 | { | |
85 | } | |
86 | ||
87 | boost::asio::detail::thread thread_; | |
88 | item* next_; | |
89 | }; | |
90 | ||
91 | // The first thread in the group. | |
92 | item* first_; | |
93 | }; | |
94 | ||
95 | } // namespace detail | |
96 | } // namespace asio | |
97 | } // namespace boost | |
98 | ||
99 | #include <boost/asio/detail/pop_options.hpp> | |
100 | ||
101 | #endif // BOOST_ASIO_DETAIL_THREAD_GROUP_HPP |