libstdc++
safe_sequence.tcc
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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
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
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
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
GNU debug classes for public use.
Base class for constructing a safe sequence type that tracks iterators that reference it.
void _M_invalidate_if(_Predicate __pred)
void _M_transfer_from_if(_Safe_sequence &__from, _Predicate __pred)
Basic functionality for a safe iterator.
Definition: safe_base.h:51
_Safe_sequence_base * _M_sequence
Definition: safe_base.h:57
_Safe_iterator_base * _M_prior
Definition: safe_base.h:70
_Safe_iterator_base * _M_next
Definition: safe_base.h:74
_Safe_iterator_base * _M_const_iterators
The list of constant iterators that reference this container.
Definition: safe_base.h:197
_Safe_iterator_base * _M_iterators
The list of mutable iterators that reference this container.
Definition: safe_base.h:194
__gnu_cxx::__mutex & _M_get_mutex()
Scoped lock idiom.
Definition: concurrence.h:229