libstdc++-v3/src/thread.cc

   1 // thread -*- C++ -*-
   2
   3 // Copyright (C) 2008, 2009, 2010, 2011 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #include <thread>
  27 #include <cerrno>
  28
  29 #if defined(_GLIBCXX_USE_GET_NPROCS)
  30 # include <sys/sysinfo.h>
  31 # define _GLIBCXX_NPROCS get_nprocs()
  32 #elif defined(_GLIBCXX_USE_SC_NPROCESSORS_ONLN)
  33 # include <unistd.h>
  34 # define _GLIBCXX_NPROCS sysconf(_SC_NPROCESSORS_ONLN)
  35 #else
  36 # define _GLIBCXX_NPROCS 0
  37 #endif
  38
  39 #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  40
  41 namespace std _GLIBCXX_VISIBILITY(default)
  42 {
  43   namespace
  44   {
  45     extern "C" void*
  46     execute_native_thread_routine(void* __p)
  47     {
  48       thread::_Impl_base* __t = static_cast<thread::_Impl_base*>(__p);
  49       thread::__shared_base_type __local;
  50       __local.swap(__t->_M_this_ptr);
  51
  52       __try
  53         {
  54           __t->_M_run();
  55         }
  56       __catch(...)
  57         {
  58           std::terminate();
  59         }
  60
  61       return 0;
  62     }
  63   }
  64
  65 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  66
  67   void
  68   thread::join()
  69   {
  70     int __e = EINVAL;
  71
  72     if (_M_id != id())
  73       __e = __gthread_join(_M_id._M_thread, 0);
  74
  75     if (__e)
  76       __throw_system_error(__e);
  77
  78     _M_id = id();
  79   }
  80
  81   void
  82   thread::detach()
  83   {
  84     int __e = EINVAL;
  85
  86     if (_M_id != id())
  87       __e = __gthread_detach(_M_id._M_thread);
  88
  89     if (__e)
  90       __throw_system_error(__e);
  91
  92     _M_id = id();
  93   }
  94
  95   void
  96   thread::_M_start_thread(__shared_base_type __b)
  97   {
  98     if (!__gthread_active_p())
  99       __throw_system_error(int(errc::operation_not_permitted));
 100
 101     __b->_M_this_ptr = __b;
 102     int __e = __gthread_create(&_M_id._M_thread,
 103                                &execute_native_thread_routine, __b.get());
 104     if (__e)
 105     {
 106       __b->_M_this_ptr.reset();
 107       __throw_system_error(__e);
 108     }
 109   }
 110
 111   unsigned int
 112   thread::hardware_concurrency() noexcept
 113   {
 114     int __n = _GLIBCXX_NPROCS;
 115     if (__n < 0)
 116       __n = 0;
 117     return __n;
 118   }
 119
 120 _GLIBCXX_END_NAMESPACE_VERSION
 121 } // namespace std
 122
 123 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1