libstdc++

safe_sequence.tcc
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1 // Safe sequence implementation -*- C++ -*-
2
3 // Copyright (C) 2010-2013 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 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
80 __gnu_cxx::__scoped_lock sentry(__from._M_get_mutex());
81
82 for (_Safe_iterator_base* __iter = __from._M_iterators; __iter;)
83 {
84 iterator* __victim = static_cast<iterator*>(__iter);
85 __iter = __iter->_M_next;
86 if (!__victim->_M_singular() && __pred(__victim->base()))
87 {
88 __victim->_M_detach_single();
89 if (__transfered_iterators)
90 {
91 __victim->_M_next = __transfered_iterators;
92 __transfered_iterators->_M_prior = __victim;
93 }
94 else
95 __last_iterator = __victim;
96 __victim->_M_sequence = this;
97 __victim->_M_version = this->_M_version;
98 __transfered_iterators = __victim;
99 }
100 }
101
102 for (_Safe_iterator_base* __iter2 = __from._M_const_iterators;
103 __iter2;)
104 {
105 const_iterator* __victim = static_cast<const_iterator*>(__iter2);
106 __iter2 = __iter2->_M_next;
107 if (!__victim->_M_singular() && __pred(__victim->base()))
108 {
109 __victim->_M_detach_single();
110 if (__transfered_const_iterators)
111 {
112 __victim->_M_next = __transfered_const_iterators;
113 __transfered_const_iterators->_M_prior = __victim;
114 }
115 else
116 __last_const_iterator = __victim;
117 __victim->_M_sequence = this;
118 __victim->_M_version = this->_M_version;
119 __transfered_const_iterators = __victim;
120 }
121 }
122 }
123
124 // Now we can lock *this and add the transfered iterators if any
125 if (__last_iterator || __last_const_iterator)
126 {
127 __gnu_cxx::__scoped_lock sentry(this->_M_get_mutex());
128 if (__last_iterator)
129 {
130 if (this->_M_iterators)
131 {
132 this->_M_iterators->_M_prior = __last_iterator;
133 __last_iterator->_M_next = this->_M_iterators;
134 }
135 this->_M_iterators = __transfered_iterators;
136 }
137 if (__last_const_iterator)
138 {
139 if (this->_M_const_iterators)
140 {
141 this->_M_const_iterators->_M_prior = __last_const_iterator;
142 __last_const_iterator->_M_next = this->_M_const_iterators;
143 }
144 this->_M_const_iterators = __transfered_const_iterators;
145 }
146 }
147 }
148 } // namespace __gnu_debug
149
150 #endif