libstdc++
safe_sequence.tcc
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1// Safe sequence implementation -*- C++ -*-
2
3// Copyright (C) 2010-2017 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
32namespace __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 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
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;
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 }
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
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
__gnu_cxx::__mutex & _M_get_mutex()
_Safe_iterator_base * _M_iterators
The list of mutable iterators that reference this container.
Definition: safe_base.h:194
Scoped lock idiom.
Definition: concurrence.h:232