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  1. // mutex -*- C++ -*-
  2.  
  3. // Copyright (C) 2008-2015 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. #include <mutex>
  26.  
  27. #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
  28. #ifndef _GLIBCXX_HAVE_TLS
  29. namespace
  30. {
  31.   inline std::unique_lock<std::mutex>*&
  32.   __get_once_functor_lock_ptr()
  33.   {
  34.     static std::unique_lock<std::mutex>* __once_functor_lock_ptr = 0;
  35.     return __once_functor_lock_ptr;
  36.   }
  37. }
  38. #endif
  39.  
  40. namespace std _GLIBCXX_VISIBILITY(default)
  41. {
  42. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  43.  
  44. #ifdef _GLIBCXX_HAVE_TLS
  45.   __thread void* __once_callable;
  46.   __thread void (*__once_call)();
  47. #else
  48.   // Explicit instantiation due to -fno-implicit-instantiation.
  49.   template class function<void()>;
  50.   function<void()> __once_functor;
  51.  
  52.   mutex&
  53.   __get_once_mutex()
  54.   {
  55.     static mutex once_mutex;
  56.     return once_mutex;
  57.   }
  58.  
  59.   // code linked against ABI 3.4.12 and later uses this
  60.   void
  61.   __set_once_functor_lock_ptr(unique_lock<mutex>* __ptr)
  62.   {
  63.     __get_once_functor_lock_ptr() = __ptr;
  64.   }
  65.  
  66.   // unsafe - retained for compatibility with ABI 3.4.11
  67.   unique_lock<mutex>&
  68.   __get_once_functor_lock()
  69.   {
  70.     static unique_lock<mutex> once_functor_lock(__get_once_mutex(), defer_lock);
  71.     return once_functor_lock;
  72.   }
  73. #endif
  74.  
  75.   extern "C"
  76.   {
  77.     void __once_proxy()
  78.     {
  79. #ifndef _GLIBCXX_HAVE_TLS
  80.       function<void()> __once_call = std::move(__once_functor);
  81.       if (unique_lock<mutex>* __lock = __get_once_functor_lock_ptr())
  82.       {
  83.         // caller is using new ABI and provided lock ptr
  84.         __get_once_functor_lock_ptr() = 0;
  85.         __lock->unlock();
  86.       }
  87.       else
  88.         __get_once_functor_lock().unlock();  // global lock
  89. #endif
  90.       __once_call();
  91.     }
  92.   }
  93.  
  94. _GLIBCXX_END_NAMESPACE_VERSION
  95. } // namespace std
  96.  
  97. #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
  98.