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// <atomic> compatibility -*- 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 "gstdint.h"

#include <atomic>

#include <mutex>

// XXX GLIBCXX_ABI Deprecated

// gcc-4.7.0

#define LOGSIZE 4

namespace

{

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

  std::mutex&

  get_atomic_mutex()

  {

    static std::mutex atomic_mutex;

    return atomic_mutex;

  }

#endif

  std::__atomic_flag_base flag_table[ 1 << LOGSIZE ] =

    {

      ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT,

      ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT,

      ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT,

      ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT,

    };

} // anonymous namespace

namespace std _GLIBCXX_VISIBILITY(default)

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  namespace __atomic0

  {

    struct atomic_flag : public __atomic_flag_base

    {

     bool

     test_and_set(memory_order) noexcept;

     void

     clear(memory_order) noexcept;

    };

    bool

    atomic_flag::test_and_set(memory_order) noexcept

    {

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

      lock_guard<mutex> __lock(get_atomic_mutex());

#endif

      bool result = _M_i;

      _M_i = true;

      return result;

    }

    void

    atomic_flag::clear(memory_order) noexcept

    {

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

      lock_guard<mutex> __lock(get_atomic_mutex());

#endif

      _M_i = false;

    }

  } // namespace __atomic0

  _GLIBCXX_BEGIN_EXTERN_C

  bool

  atomic_flag_test_and_set_explicit(__atomic_flag_base* __a,

                                    memory_order __m) _GLIBCXX_NOTHROW

  {

    atomic_flag* d = static_cast<atomic_flag*>(__a);

    return d->test_and_set(__m);

  }

  void

  atomic_flag_clear_explicit(__atomic_flag_base* __a,

                             memory_order __m) _GLIBCXX_NOTHROW

  {

    atomic_flag* d = static_cast<atomic_flag*>(__a);

    return d->clear(__m);

  }

  void

  __atomic_flag_wait_explicit(__atomic_flag_base* __a,

                              memory_order __x) _GLIBCXX_NOTHROW

  {

    while (atomic_flag_test_and_set_explicit(__a, __x))

      { };

  }

  _GLIBCXX_CONST __atomic_flag_base*

  __atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW

  {

    uintptr_t __u = reinterpret_cast<uintptr_t>(__z);

    __u += (__u >> 2) + (__u << 4);

    __u += (__u >> 7) + (__u << 5);

    __u += (__u >> 17) + (__u << 13);

    if (sizeof(uintptr_t) > 4)

      __u += (__u >> 31);

    __u &= ~((~uintptr_t(0)) << LOGSIZE);

    return flag_table + __u;

  }

  _GLIBCXX_END_EXTERN_C

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace std

// XXX GLIBCXX_ABI Deprecated

// gcc-4.5.0

// <atomic> signature changes

// The rename syntax for default exported names is

//   asm (".symver name1,exportedname@GLIBCXX_3.4")

//   asm (".symver name2,exportedname@@GLIBCXX_3.4.5")

// In the future, GLIBCXX_ABI > 6 should remove all uses of

// _GLIBCXX_*_SYMVER macros in this file.

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

    && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \

    && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT)

#define _GLIBCXX_ASM_SYMVER(cur, old, version) \

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

_GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag5clearESt12memory_order, _ZNVSt9__atomic011atomic_flag5clearESt12memory_order, GLIBCXX_3.4.11)

_GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag12test_and_setESt12memory_order, _ZNVSt9__atomic011atomic_flag12test_and_setESt12memory_order, GLIBCXX_3.4.11)

#endif