1 //
2 // detail/posix_thread.hpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 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_THREAD_HPP
12 #define BOOST_ASIO_DETAIL_POSIX_THREAD_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 <cstddef>
23 #include <pthread.h>
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 extern "C"
33 {
34   BOOST_ASIO_DECL void* boost_asio_detail_posix_thread_function(void* arg);
35 }
36 
37 class posix_thread
38   : private noncopyable
39 {
40 public:
41   // Constructor.
42   template <typename Function>
posix_thread(Function f,unsigned int=0)43   posix_thread(Function f, unsigned int = 0)
44     : joined_(false)
45   {
46     start_thread(new func<Function>(f));
47   }
48 
49   // Destructor.
50   BOOST_ASIO_DECL ~posix_thread();
51 
52   // Wait for the thread to exit.
53   BOOST_ASIO_DECL void join();
54 
55   // Get number of CPUs.
56   BOOST_ASIO_DECL static std::size_t hardware_concurrency();
57 
58 private:
59   friend void* boost_asio_detail_posix_thread_function(void* arg);
60 
61   class func_base
62   {
63   public:
~func_base()64     virtual ~func_base() {}
65     virtual void run() = 0;
66   };
67 
68   struct auto_func_base_ptr
69   {
70     func_base* ptr;
~auto_func_base_ptrboost::asio::detail::posix_thread::auto_func_base_ptr71     ~auto_func_base_ptr() { delete ptr; }
72   };
73 
74   template <typename Function>
75   class func
76     : public func_base
77   {
78   public:
func(Function f)79     func(Function f)
80       : f_(f)
81     {
82     }
83 
run()84     virtual void run()
85     {
86       f_();
87     }
88 
89   private:
90     Function f_;
91   };
92 
93   BOOST_ASIO_DECL void start_thread(func_base* arg);
94 
95   ::pthread_t thread_;
96   bool joined_;
97 };
98 
99 } // namespace detail
100 } // namespace asio
101 } // namespace boost
102 
103 #include <boost/asio/detail/pop_options.hpp>
104 
105 #if defined(BOOST_ASIO_HEADER_ONLY)
106 # include <boost/asio/detail/impl/posix_thread.ipp>
107 #endif // defined(BOOST_ASIO_HEADER_ONLY)
108 
109 #endif // defined(BOOST_ASIO_HAS_PTHREADS)
110 
111 #endif // BOOST_ASIO_DETAIL_POSIX_THREAD_HPP
112