libstdc++-v3/src/thread.cc

   1 // thread -*- C++ -*-
   2
   3 // Copyright (C) 2008 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #include <thread>
  31 #include <bits/move.h> // std::move
  32
  33 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  34
  35 namespace std
  36 {
  37   namespace
  38   {
  39     extern "C"
  40     {
  41       void* __thread_proxy(void* __p)
  42       {
  43         __thread_data_base* __t = static_cast<__thread_data_base*>(__p);
  44         __thread_data_ptr __local_thread_data = __t->_M_this_ptr;
  45         __t->_M_this_ptr.reset();
  46
  47         try
  48           {
  49             __local_thread_data->__run();
  50           }
  51         catch(...)
  52           {
  53             std::terminate();
  54           }
  55
  56         return 0;
  57       }
  58     }
  59   }
  60
  61   thread::thread()
  62   { }
  63
  64   thread::~thread()
  65   {
  66     detach();
  67   }
  68
  69   thread::id
  70   thread::get_id() const
  71   {
  72     if(_M_thread_data)
  73       return thread::id(_M_thread_data->_M_thread_handle);
  74     else
  75       return thread::id();
  76   }
  77
  78   bool
  79   thread::joinable() const
  80   { return get_id() != id(); }
  81
  82   void
  83   thread::join()
  84   {
  85     if(joinable())
  86       {
  87         void* __r = 0;
  88         int __e = __gthread_join(_M_thread_data->_M_thread_handle, &__r);
  89         if(__e)
  90           __throw_system_error(__e);
  91
  92         lock_guard<mutex> __lock(_M_thread_data_mutex);
  93         _M_thread_data.reset();
  94       }
  95   }
  96
  97   void
  98   thread::detach()
  99   {
 100     if(joinable())
 101       {
 102         int __e = __gthread_detach(_M_thread_data->_M_thread_handle);
 103         if(__e)
 104           __throw_system_error(__e);
 105
 106         lock_guard<mutex> __lock(_M_thread_data_mutex);
 107         _M_thread_data.reset();
 108       }
 109   }
 110
 111   void
 112   thread::swap(thread&& __t)
 113   {
 114     std::swap(_M_thread_data, __t._M_thread_data);
 115   }
 116
 117   void
 118   thread::__start_thread()
 119   {
 120     _M_thread_data->_M_this_ptr = _M_thread_data;
 121     int __e = __gthread_create(&_M_thread_data->_M_thread_handle,
 122                                &__thread_proxy, _M_thread_data.get());
 123     if(__e)
 124       __throw_system_error(__e);
 125   }
 126
 127   namespace this_thread
 128   {
 129     thread::id
 130     get_id()
 131     { return thread::id(__gthread_self()); }
 132
 133     void
 134     yield()
 135     { __gthread_yield(); }
 136   }
 137 }
 138
 139 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1