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      1 // Safe sequence implementation  -*- C++ -*-
      2 
      3 // Copyright (C) 2010-2024 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
    157