1 // Safe sequence implementation -*- C++ -*- 2 3 // Copyright (C) 2010-2021 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>:: _M_invalidate_if(_Predicate __pred)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>:: _M_transfer_from_if(_Safe_sequence & __from,_Predicate __pred)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