boost/asio/detail/posix_thread.hpp

   1 //
   2 // posix_thread.hpp
   3 // ~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2008 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/push_options.hpp>
  19
  20 #include <boost/asio/detail/push_options.hpp>
  21 #include <boost/config.hpp>
  22 #include <boost/system/system_error.hpp>
  23 #include <boost/asio/detail/pop_options.hpp>
  24
  25 #if defined(BOOST_HAS_PTHREADS)
  26
  27 #include <boost/asio/detail/push_options.hpp>
  28 #include <memory>
  29 #include <boost/throw_exception.hpp>
  30 #include <pthread.h>
  31 #include <boost/asio/detail/pop_options.hpp>
  32
  33 #include <boost/asio/error.hpp>
  34 #include <boost/asio/detail/noncopyable.hpp>
  35
  36 namespace boost {
  37 namespace asio {
  38 namespace detail {
  39
  40 extern "C" void* asio_detail_posix_thread_function(void* arg);
  41
  42 class posix_thread
  43   : private noncopyable
  44 {
  45 public:
  46   // Constructor.
  47   template <typename Function>
  48   posix_thread(Function f)
  49     : joined_(false)
  50   {
  51     std::auto_ptr<func_base> arg(new func<Function>(f));
  52     int error = ::pthread_create(&thread_, 0,
  53           asio_detail_posix_thread_function, arg.get());
  54     if (error != 0)
  55     {
  56       boost::system::system_error e(
  57           boost::system::error_code(error,
  58             boost::asio::error::get_system_category()),
  59           "thread");
  60       boost::throw_exception(e);
  61     }
  62     arg.release();
  63   }
  64
  65   // Destructor.
  66   ~posix_thread()
  67   {
  68     if (!joined_)
  69       ::pthread_detach(thread_);
  70   }
  71
  72   // Wait for the thread to exit.
  73   void join()
  74   {
  75     if (!joined_)
  76     {
  77       ::pthread_join(thread_, 0);
  78       joined_ = true;
  79     }
  80   }
  81
  82 private:
  83   friend void* asio_detail_posix_thread_function(void* arg);
  84
  85   class func_base
  86   {
  87   public:
  88     virtual ~func_base() {}
  89     virtual void run() = 0;
  90   };
  91
  92   template <typename Function>
  93   class func
  94     : public func_base
  95   {
  96   public:
  97     func(Function f)
  98       : f_(f)
  99     {
 100     }
 101
 102     virtual void run()
 103     {
 104       f_();
 105     }
 106
 107   private:
 108     Function f_;
 109   };
 110
 111   ::pthread_t thread_;
 112   bool joined_;
 113 };
 114
 115 inline void* asio_detail_posix_thread_function(void* arg)
 116 {
 117   std::auto_ptr<posix_thread::func_base> f(
 118       static_cast<posix_thread::func_base*>(arg));
 119   f->run();
 120   return 0;
 121 }
 122
 123 } // namespace detail
 124 } // namespace asio
 125 } // namespace boost
 126
 127 #endif // defined(BOOST_HAS_PTHREADS)
 128
 129 #include <boost/asio/detail/pop_options.hpp>
 130
 131 #endif // BOOST_ASIO_DETAIL_POSIX_THREAD_HPP