libstdc++
safe_sequence.tcc
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1 // Safe sequence implementation -*- C++ -*-
2 
3 // Copyright (C) 2010 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  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
_Safe_iterator_base * _M_next
Definition: safe_base.h:73
unsigned int _M_version
The container version number. This number may never be 0.
Definition: safe_base.h:188
_Safe_iterator_base * _M_iterators
The list of mutable iterators that reference this container.
Definition: safe_base.h:182
void _M_invalidate_if(_Predicate __pred)
_Safe_sequence_base * _M_sequence
Definition: safe_base.h:56
_Safe_iterator_base * _M_prior
Definition: safe_base.h:69
Base class for constructing a safe sequence type that tracks iterators that reference it...
Definition: formatter.h:50
void _M_transfer_from_if(_Safe_sequence &__from, _Predicate __pred)
__gnu_cxx::__mutex & _M_get_mutex()
Basic functionality for a safe iterator.
Definition: safe_base.h:51
_Safe_iterator_base * _M_const_iterators
The list of constant iterators that reference this container.
Definition: safe_base.h:185
Scoped lock idiom.
Definition: concurrence.h:311