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  1. // Bitmap Allocator. Out of line function definitions. -*- C++ -*-
  2.  
  3. // Copyright (C) 2004-2013 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 <ext/bitmap_allocator.h>
  26.  
  27. namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  28. {
  29.   namespace __detail
  30.   {
  31.   _GLIBCXX_BEGIN_NAMESPACE_VERSION
  32.     template class __mini_vector<
  33.       std::pair<bitmap_allocator<char>::_Alloc_block*,
  34.                 bitmap_allocator<char>::_Alloc_block*> >;
  35.  
  36.     template class __mini_vector<
  37.       std::pair<bitmap_allocator<wchar_t>::_Alloc_block*,
  38.                 bitmap_allocator<wchar_t>::_Alloc_block*> >;
  39.  
  40.     template class __mini_vector<size_t*>;
  41.  
  42.     template size_t** __lower_bound(size_t**, size_t**, size_t const&,
  43.                                     free_list::_LT_pointer_compare);
  44.   _GLIBCXX_END_NAMESPACE_VERSION
  45.   }
  46.  
  47. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  48.  
  49.   size_t*
  50.   free_list::
  51.   _M_get(size_t __sz) throw(std::bad_alloc)
  52.   {
  53. #if defined __GTHREADS
  54.     __mutex_type& __bfl_mutex = _M_get_mutex();
  55.     __bfl_mutex.lock();
  56. #endif
  57.     const vector_type& __free_list = _M_get_free_list();
  58.     using __gnu_cxx::__detail::__lower_bound;
  59.     iterator __tmp = __lower_bound(__free_list.begin(), __free_list.end(),
  60.                                    __sz, _LT_pointer_compare());
  61.  
  62.     if (__tmp == __free_list.end() || !_M_should_i_give(**__tmp, __sz))
  63.       {
  64.         // We release the lock here, because operator new is
  65.         // guaranteed to be thread-safe by the underlying
  66.         // implementation.
  67. #if defined __GTHREADS
  68.         __bfl_mutex.unlock();
  69. #endif
  70.         // Try twice to get the memory: once directly, and the 2nd
  71.         // time after clearing the free list. If both fail, then throw
  72.         // std::bad_alloc().
  73.         int __ctr = 2;
  74.         while (__ctr)
  75.           {
  76.             size_t* __ret = 0;
  77.             --__ctr;
  78.             __try
  79.               {
  80.                 __ret = reinterpret_cast<size_t*>
  81.                   (::operator new(__sz + sizeof(size_t)));
  82.               }
  83.             __catch(const std::bad_alloc&)
  84.               {
  85.                 this->_M_clear();
  86.               }
  87.             if (!__ret)
  88.               continue;
  89.             *__ret = __sz;
  90.             return __ret + 1;
  91.           }
  92.         std::__throw_bad_alloc();
  93.       }
  94.     else
  95.       {
  96.         size_t* __ret = *__tmp;
  97.         _M_get_free_list().erase(__tmp);
  98. #if defined __GTHREADS
  99.         __bfl_mutex.unlock();
  100. #endif
  101.         return __ret + 1;
  102.       }
  103.   }
  104.  
  105.   void
  106.   free_list::
  107.   _M_clear()
  108.   {
  109. #if defined __GTHREADS
  110.     __gnu_cxx::__scoped_lock __bfl_lock(_M_get_mutex());
  111. #endif
  112.     vector_type& __free_list = _M_get_free_list();
  113.     iterator __iter = __free_list.begin();
  114.     while (__iter != __free_list.end())
  115.       {
  116.         ::operator delete((void*)*__iter);
  117.         ++__iter;
  118.       }
  119.     __free_list.clear();
  120.   }
  121.  
  122.   // Instantiations.
  123.   template class bitmap_allocator<char>;
  124.   template class bitmap_allocator<wchar_t>;
  125.  
  126. _GLIBCXX_END_NAMESPACE_VERSION
  127. } // namespace
  128.