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// thread -*- C++ -*-

// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

#include <thread>

#include <system_error>

#include <cerrno>

#if defined(_GLIBCXX_USE_GET_NPROCS)

# include <sys/sysinfo.h>

# define _GLIBCXX_NPROCS get_nprocs()

#elif defined(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP)

# define _GLIBCXX_NPROCS pthread_num_processors_np()

#elif defined(_GLIBCXX_USE_SYSCTL_HW_NCPU)

# include <stddef.h>

# include <sys/sysctl.h>

static inline int get_nprocs()

{

 int count;

 size_t size = sizeof(count);

 int mib[] = { CTL_HW, HW_NCPU };

 if (!sysctl(mib, 2, &count, &size, NULL, 0))

   return count;

 return 0;

}

# define _GLIBCXX_NPROCS get_nprocs()

#elif defined(_GLIBCXX_USE_SC_NPROCESSORS_ONLN)

# include <unistd.h>

# define _GLIBCXX_NPROCS sysconf(_SC_NPROCESSORS_ONLN)

#elif defined(_GLIBCXX_USE_SC_NPROC_ONLN)

# include <unistd.h>

# define _GLIBCXX_NPROCS sysconf(_SC_NPROC_ONLN)

#else

# define _GLIBCXX_NPROCS 0

#endif

#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)

namespace std _GLIBCXX_VISIBILITY(default)

{

  namespace

  {

    extern "C" void*

    execute_native_thread_routine(void* __p)

    {

      thread::_Impl_base* __t = static_cast<thread::_Impl_base*>(__p);

      thread::__shared_base_type __local;

      __local.swap(__t->_M_this_ptr);

      __try

        {

          __t->_M_run();

        }

      __catch(...)

        {

          std::terminate();

        }

      return 0;

    }

  }

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  void

  thread::join()

  {

    int __e = EINVAL;

    if (_M_id != id())

      __e = __gthread_join(_M_id._M_thread, 0);

    if (__e)

      __throw_system_error(__e);

    _M_id = id();

  }

  void

  thread::detach()

  {

    int __e = EINVAL;

    if (_M_id != id())

      __e = __gthread_detach(_M_id._M_thread);

    if (__e)

      __throw_system_error(__e);

    _M_id = id();

  }

  void

  thread::_M_start_thread(__shared_base_type __b)

  {

    if (!__gthread_active_p())

      __throw_system_error(int(errc::operation_not_permitted));

    __b->_M_this_ptr = __b;

    int __e = __gthread_create(&_M_id._M_thread,

                               &execute_native_thread_routine, __b.get());

    if (__e)

    {

      __b->_M_this_ptr.reset();

      __throw_system_error(__e);

    }

  }

  unsigned int

  thread::hardware_concurrency() noexcept

  {

    int __n = _GLIBCXX_NPROCS;

    if (__n < 0)

      __n = 0;

    return __n;

  }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace std

#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1