libstdc++-v3/include/debug/safe_sequence.tcc

   1 // Safe sequence implementation  -*- C++ -*-
   2
   3 // Copyright (C) 2010-2018 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 /** @file debug/safe_sequence.tcc
  26  *  This file is a GNU debug extension to the Standard C++ Library.
  27  */
  28
  29 #ifndef _GLIBCXX_DEBUG_SAFE_SEQUENCE_TCC
  30 #define _GLIBCXX_DEBUG_SAFE_SEQUENCE_TCC 1
  31
  32 namespace __gnu_debug
  33 {
  34   template<typename _Sequence>
  35     template<typename _Predicate>
  36       void
  37       _Safe_sequence<_Sequence>::
  38       _M_invalidate_if(_Predicate __pred)
  39       {
  40         typedef typename _Sequence::iterator iterator;
  41         typedef typename _Sequence::const_iterator const_iterator;
  42
  43         __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
  44         for (_Safe_iterator_base* __iter = _M_iterators; __iter;)
  45           {
  46             iterator* __victim = static_cast<iterator*>(__iter);
  47             __iter = __iter->_M_next;
  48             if (!__victim->_M_singular() && __pred(__victim->base()))
  49               {
  50                 __victim->_M_invalidate();
  51               }
  52           }
  53
  54         for (_Safe_iterator_base* __iter2 = _M_const_iterators; __iter2;)
  55           {
  56             const_iterator* __victim = static_cast<const_iterator*>(__iter2);
  57             __iter2 = __iter2->_M_next;
  58             if (!__victim->_M_singular() && __pred(__victim->base()))
  59               {
  60                 __victim->_M_invalidate();
  61               }
  62           }
  63       }
  64
  65   template<typename _Sequence>
  66     template<typename _Predicate>
  67       void
  68       _Safe_sequence<_Sequence>::
  69       _M_transfer_from_if(_Safe_sequence& __from, _Predicate __pred)
  70       {
  71         typedef typename _Sequence::iterator iterator;
  72         typedef typename _Sequence::const_iterator const_iterator;
  73
  74         _Safe_iterator_base* __transfered_iterators = 0;
  75         _Safe_iterator_base* __transfered_const_iterators = 0;
  76         _Safe_iterator_base* __last_iterator = 0;
  77         _Safe_iterator_base* __last_const_iterator = 0;
  78         {
  79           // We lock __from first and detach iterator(s) to transfer
  80           __gnu_cxx::__scoped_lock sentry(__from._M_get_mutex());
  81
  82           for (_Safe_iterator_base* __iter = __from._M_iterators; __iter;)
  83             {
  84               _Safe_iterator_base* __victim_base = __iter;
  85               iterator* __victim = static_cast<iterator*>(__victim_base);
  86               __iter = __iter->_M_next;
  87               if (!__victim->_M_singular() && __pred(__victim->base()))
  88                 {
  89                   __victim->_M_detach_single();
  90                   if (__transfered_iterators)
  91                     {
  92                       __victim_base->_M_next = __transfered_iterators;
  93                       __transfered_iterators->_M_prior = __victim_base;
  94                     }
  95                   else
  96                     __last_iterator = __victim_base;
  97                   __victim_base->_M_sequence = this;
  98                   __victim_base->_M_version = this->_M_version;
  99                   __transfered_iterators = __victim_base;
 100                 }
 101             }
 102
 103           for (_Safe_iterator_base* __iter2 = __from._M_const_iterators;
 104                  __iter2;)
 105             {
 106               _Safe_iterator_base* __victim_base = __iter2;
 107               const_iterator* __victim =
 108                 static_cast<const_iterator*>(__victim_base);
 109               __iter2 = __iter2->_M_next;
 110               if (!__victim->_M_singular() && __pred(__victim->base()))
 111                 {
 112                   __victim->_M_detach_single();
 113                   if (__transfered_const_iterators)
 114                     {
 115                       __victim_base->_M_next = __transfered_const_iterators;
 116                       __transfered_const_iterators->_M_prior = __victim_base;
 117                     }
 118                   else
 119                     __last_const_iterator = __victim;
 120                   __victim_base->_M_sequence = this;
 121                   __victim_base->_M_version = this->_M_version;
 122                   __transfered_const_iterators = __victim_base;
 123                 }
 124             }
 125         }
 126
 127         // Now we can lock *this and add the transfered iterators if any
 128         if (__last_iterator || __last_const_iterator)
 129           {
 130             __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
 131             if (__last_iterator)
 132               {
 133                 if (this->_M_iterators)
 134                   {
 135                     this->_M_iterators->_M_prior = __last_iterator;
 136                     __last_iterator->_M_next = this->_M_iterators;
 137                   }
 138                 this->_M_iterators = __transfered_iterators;
 139               }
 140             if (__last_const_iterator)
 141               {
 142                 if (this->_M_const_iterators)
 143                   {
 144                     this->_M_const_iterators->_M_prior = __last_const_iterator;
 145                     __last_const_iterator->_M_next = this->_M_const_iterators;
 146                   }
 147                 this->_M_const_iterators = __transfered_const_iterators;
 148               }
 149           }
 150       }
 151 } // namespace __gnu_debug
 152
 153 #endif