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//  -*- C++ -*-

// Copyright (C) 2008, 2009, 2010 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

// .

/** @file thread

 *  This is a Standard C++ Library header.

 */

#ifndef _GLIBCXX_THREAD

#define _GLIBCXX_THREAD 1

#pragma GCC system_header

#ifndef __GXX_EXPERIMENTAL_CXX0X__

# include 

#else

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

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

namespace std

{

  /**

   * @defgroup threads Threads

   * @ingroup concurrency

   *

   * Classes for thread support.

   * @{

   */

  template

    struct hash;

  /// thread

  class thread

  {

  public:

    typedef __gthread_t                 native_handle_type;

    struct _Impl_base;

    typedef shared_ptr<_Impl_base>  __shared_base_type;

    /// thread::id

    class id

    {

      native_handle_type        _M_thread;

    public:

      id() : _M_thread() { }

      explicit

      id(native_handle_type __id) : _M_thread(__id) { }

    private:

      friend class thread;

      friend class hash;

      friend bool

      operator==(thread::id __x, thread::id __y)

      { return __gthread_equal(__x._M_thread, __y._M_thread); }

      friend bool

      operator<(thread::id __x, thread::id __y)

      { return __x._M_thread < __y._M_thread; }

      template

        friend basic_ostream<_CharT, _Traits>&

        operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id);

    };

    // Simple base type that the templatized, derived class containing

    // an arbitrary functor can be converted to and called.

    struct _Impl_base

    {

      __shared_base_type        _M_this_ptr;

      inline virtual ~_Impl_base();

      virtual void _M_run() = 0;

    };

    template

      struct _Impl : public _Impl_base

      {

        _Callable               _M_func;

        _Impl(_Callable&& __f) : _M_func(std::forward<_Callable>(__f))

        { }

        void

        _M_run() { _M_func(); }

      };

  private:

    id                          _M_id;

  public:

    thread() = default;

    thread(const thread&) = delete;

    thread(thread&& __t)

    { swap(__t); }

    template

      explicit thread(_Callable __f)

      {

        _M_start_thread(_M_make_routine<_Callable>

                        (std::forward<_Callable>(__f)));

      }

    template

      thread(_Callable&& __f, _Args&&... __args)

      { _M_start_thread(_M_make_routine(std::bind(__f, __args...))); }

    ~thread()

    {

      if (joinable())

        std::terminate();

    }

    thread& operator=(const thread&) = delete;

    thread& operator=(thread&& __t)

    {

      if (joinable())

        std::terminate();

      swap(__t);

      return *this;

    }

    void

    swap(thread& __t)

    { std::swap(_M_id, __t._M_id); }

    bool

    joinable() const

    { return !(_M_id == id()); }

    void

    join();

    void

    detach();

    thread::id

    get_id() const

    { return _M_id; }

    /** @pre thread is joinable

     */

    native_handle_type

    native_handle()

    { return _M_id._M_thread; }

    // Returns a value that hints at the number of hardware thread contexts.

    static unsigned int

    hardware_concurrency()

    { return 0; }

  private:

    void

    _M_start_thread(__shared_base_type);

    template

      shared_ptr<_Impl<_Callable>>

      _M_make_routine(_Callable&& __f)

      {

        // Create and allocate full data structure, not base.

        return make_shared<_Impl<_Callable>>(std::forward<_Callable>(__f));

      }

  };

  inline thread::_Impl_base::~_Impl_base() = default;

  inline void

  swap(thread& __x, thread& __y)

  { __x.swap(__y); }

  inline bool

  operator!=(thread::id __x, thread::id __y)

  { return !(__x == __y); }

  inline bool

  operator<=(thread::id __x, thread::id __y)

  { return !(__y < __x); }

  inline bool

  operator>(thread::id __x, thread::id __y)

  { return __y < __x; }

  inline bool

  operator>=(thread::id __x, thread::id __y)

  { return !(__x < __y); }

  // DR 889.

  /// std::hash specialization for thread::id.

  template<>

    struct hash

    : public std::unary_function

    {

      size_t

      operator()(const thread::id& __id) const

      { return std::_Fnv_hash::hash(__id._M_thread); }

    };

  template

    inline basic_ostream<_CharT, _Traits>&

    operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id)

    {

      if (__id == thread::id())

        return __out << "thread::id of a non-executing thread";

      else

        return __out << __id._M_thread;

    }

  /** @namespace std::this_thread

   *  @brief ISO C++ 0x entities sub namespace for thread.

   *  30.2.2 Namespace this_thread.

   */

  namespace this_thread

  {

    /// get_id

    inline thread::id

    get_id() { return thread::id(__gthread_self()); }

#ifdef _GLIBCXX_USE_SCHED_YIELD

    /// yield

    inline void

    yield()

    { __gthread_yield(); }

#endif

#ifdef _GLIBCXX_USE_NANOSLEEP

    /// sleep_until

    template

      inline void

      sleep_until(const chrono::time_point<_Clock, _Duration>& __atime)

      { sleep_for(__atime - _Clock::now()); }

    /// sleep_for

    template

      inline void

      sleep_for(const chrono::duration<_Rep, _Period>& __rtime)

      {

        chrono::seconds __s =

          chrono::duration_cast(__rtime);

        chrono::nanoseconds __ns =

          chrono::duration_cast(__rtime - __s);

        __gthread_time_t __ts =

          {

            static_cast(__s.count()),

            static_cast(__ns.count())

          };

        ::nanosleep(&__ts, 0);

      }

#endif

  }

  // @} group threads

}

#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1

#endif // __GXX_EXPERIMENTAL_CXX0X__

#endif // _GLIBCXX_THREAD