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
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
151