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

   1 // Safe sequence implementation  -*- C++ -*-
   2
   3 // Copyright (C) 2010-2020 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         if (this == std::__addressof(__from))
  72           return;
  73
  74         typedef typename _Sequence::iterator iterator;
  75         typedef typename _Sequence::const_iterator const_iterator;
  76
  77         _Safe_iterator_base* __transfered_iterators = 0;
  78         _Safe_iterator_base* __transfered_const_iterators = 0;
  79         _Safe_iterator_base* __last_iterator = 0;
  80         _Safe_iterator_base* __last_const_iterator = 0;
  81         {
  82           // We lock __from first and detach iterator(s) to transfer
  83           __gnu_cxx::__scoped_lock sentry(__from._M_get_mutex());
  84
  85           for (_Safe_iterator_base* __iter = __from._M_iterators; __iter;)
  86             {
  87               _Safe_iterator_base* __victim_base = __iter;
  88               iterator* __victim = static_cast<iterator*>(__victim_base);
  89               __iter = __iter->_M_next;
  90               if (!__victim->_M_singular() && __pred(__victim->base()))
  91                 {
  92                   __victim->_M_detach_single();
  93                   if (__transfered_iterators)
  94                     {
  95                       __victim_base->_M_next = __transfered_iterators;
  96                       __transfered_iterators->_M_prior = __victim_base;
  97                     }
  98                   else
  99                     __last_iterator = __victim_base;
 100                   __victim_base->_M_sequence = this;
 101                   __victim_base->_M_version = this->_M_version;
 102                   __transfered_iterators = __victim_base;
 103                 }
 104             }
 105
 106           for (_Safe_iterator_base* __iter2 = __from._M_const_iterators;
 107                  __iter2;)
 108             {
 109               _Safe_iterator_base* __victim_base = __iter2;
 110               const_iterator* __victim =
 111                 static_cast<const_iterator*>(__victim_base);
 112               __iter2 = __iter2->_M_next;
 113               if (!__victim->_M_singular() && __pred(__victim->base()))
 114                 {
 115                   __victim->_M_detach_single();
 116                   if (__transfered_const_iterators)
 117                     {
 118                       __victim_base->_M_next = __transfered_const_iterators;
 119                       __transfered_const_iterators->_M_prior = __victim_base;
 120                     }
 121                   else
 122                     __last_const_iterator = __victim;
 123                   __victim_base->_M_sequence = this;
 124                   __victim_base->_M_version = this->_M_version;
 125                   __transfered_const_iterators = __victim_base;
 126                 }
 127             }
 128         }
 129
 130         // Now we can lock *this and add the transfered iterators if any
 131         if (__last_iterator || __last_const_iterator)
 132           {
 133             __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
 134             if (__last_iterator)
 135               {
 136                 if (this->_M_iterators)
 137                   {
 138                     this->_M_iterators->_M_prior = __last_iterator;
 139                     __last_iterator->_M_next = this->_M_iterators;
 140                   }
 141                 this->_M_iterators = __transfered_iterators;
 142               }
 143             if (__last_const_iterator)
 144               {
 145                 if (this->_M_const_iterators)
 146                   {
 147                     this->_M_const_iterators->_M_prior = __last_const_iterator;
 148                     __last_const_iterator->_M_next = this->_M_const_iterators;
 149                   }
 150                 this->_M_const_iterators = __transfered_const_iterators;
 151               }
 152           }
 153       }
 154 } // namespace __gnu_debug
 155
 156 #endif