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// mutex -*- 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

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

#include <mutex>

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

#ifndef _GLIBCXX_HAVE_TLS

namespace

{

  inline std::unique_lock<std::mutex>*&

  __get_once_functor_lock_ptr()

  {

    static std::unique_lock<std::mutex>* __once_functor_lock_ptr = 0;

    return __once_functor_lock_ptr;

  }

}

#endif

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

#ifdef _GLIBCXX_HAVE_TLS

  __thread void* __once_callable;

  __thread void (*__once_call)();

#else

  // Explicit instantiation due to -fno-implicit-instantiation.

  template class function<void()>;

  function<void()> __once_functor;

  mutex&

  __get_once_mutex()

  {

    static mutex once_mutex;

    return once_mutex;

  }

  // code linked against ABI 3.4.12 and later uses this

  void

  __set_once_functor_lock_ptr(unique_lock<mutex>* __ptr)

  {

    __get_once_functor_lock_ptr() = __ptr;

  }

  // unsafe - retained for compatibility with ABI 3.4.11

  unique_lock<mutex>&

  __get_once_functor_lock()

  {

    static unique_lock<mutex> once_functor_lock(__get_once_mutex(), defer_lock);

    return once_functor_lock;

  }

#endif

  extern "C"

  {

    void __once_proxy()

    {

#ifndef _GLIBCXX_HAVE_TLS

      function<void()> __once_call = std::move(__once_functor);

      if (unique_lock<mutex>* __lock = __get_once_functor_lock_ptr())

      {

        // caller is using new ABI and provided lock ptr

        __get_once_functor_lock_ptr() = 0;

        __lock->unlock();

      }

      else

        __get_once_functor_lock().unlock();  // global lock

#endif

      __once_call();

    }

  }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace

// XXX GLIBCXX_ABI Deprecated

// gcc-4.6.0

// <mutex> export changes

#if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \

    && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \

    && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)

{

  std::defer_lock_t defer_lock;

  std::try_to_lock_t try_to_lock;

  std::adopt_lock_t adopt_lock;

}

#define _GLIBCXX_ASM_SYMVER(cur, old, version) \

   asm (".symver " #cur "," #old "@@" #version);

_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10adopt_lockE, _ZSt10adopt_lock, GLIBCXX_3.4.11)

_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx10defer_lockE, _ZSt10defer_lock, GLIBCXX_3.4.11)

_GLIBCXX_ASM_SYMVER(_ZN9__gnu_cxx11try_to_lockE, _ZSt11try_to_lock, GLIBCXX_3.4.11)

#endif

#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1