summaryrefslogtreecommitdiff
path: root/boost/interprocess/smart_ptr/detail/shared_count.hpp
blob: 0150ef6c0086b7d09dac951c5abdf87bbb8abdf3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
//////////////////////////////////////////////////////////////////////////////
//
// This file is the adaptation for Interprocess of boost/detail/shared_count.hpp
//
// (C) Copyright Peter Dimov and Multi Media Ltd. 2001, 2002, 2003
// (C) Copyright Peter Dimov 2004-2005
// (C) Copyright Ion Gaztanaga 2006-2011. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_DETAIL_SHARED_COUNT_HPP_INCLUDED
#define BOOST_INTERPROCESS_DETAIL_SHARED_COUNT_HPP_INCLUDED

// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>

#include <boost/checked_delete.hpp>
#include <boost/intrusive/pointer_traits.hpp>
#include <boost/interprocess/smart_ptr/detail/bad_weak_ptr.hpp>
#include <boost/interprocess/smart_ptr/detail/sp_counted_impl.hpp>
#include <boost/interprocess/detail/utilities.hpp>
#include <boost/container/allocator/allocator_traits.hpp>
#include <boost/detail/no_exceptions_support.hpp>
#include <functional>       // std::less

namespace boost {
namespace interprocess {
namespace ipcdetail{

template<class T, class VoidAllocator, class Deleter>
class weak_count;

template<class T, class VoidAllocator, class Deleter>
class shared_count
{
   public:
   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<T>::type                         pointer;

   private:
   typedef sp_counted_impl_pd<VoidAllocator, Deleter>       counted_impl;

   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<counted_impl>::type                         counted_impl_ptr;
   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<sp_counted_base>::type                       counted_base_ptr;

   typedef boost::container::allocator_traits<VoidAllocator>         vallocator_traits;

   typedef typename vallocator_traits::template
      portable_rebind_alloc<counted_impl>::type                      counted_impl_allocator;

   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<const Deleter>::type                         const_deleter_pointer;

   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<const VoidAllocator>::type                   const_allocator_pointer;

   pointer           m_px;
   counted_impl_ptr  m_pi;

   template <class T2, class VoidAllocator2, class Deleter2>
   friend class weak_count;

   template <class T2, class VoidAllocator2, class Deleter2>
   friend class shared_count;

   public:

   shared_count()
      :  m_px(0), m_pi(0) // nothrow
   {}

   template <class Ptr>
   shared_count(const shared_count &other_shared_count, const Ptr &p)
      :  m_px(p), m_pi(other_shared_count.m_pi)
   {}

   template <class Ptr>
   shared_count(const Ptr &p, const VoidAllocator &a, Deleter d)
      :  m_px(p), m_pi(0)
   {
      BOOST_TRY{
         if(p){
            counted_impl_allocator alloc(a);
            m_pi = alloc.allocate(1);
            //Anti-exception deallocator
            scoped_ptr<counted_impl, 
                     scoped_ptr_dealloc_functor<counted_impl_allocator> >
                        deallocator(m_pi, alloc);
            //It's more correct to use VoidAllocator::construct but
            //this needs copy constructor and we don't like it
            new(ipcdetail::to_raw_pointer(m_pi))counted_impl(p, a, d);
            deallocator.release();
         }
      }
      BOOST_CATCH (...){
         d(p); // delete p
         BOOST_RETHROW
      }
      BOOST_CATCH_END
   }

   ~shared_count() // nothrow
   {  
      if(m_pi)
         m_pi->release();
   }

   shared_count(shared_count const & r)
      :  m_px(r.m_px), m_pi(r.m_pi) // nothrow
   { if( m_pi != 0 ) m_pi->add_ref_copy(); }

   //this is a test
   template<class Y>
   explicit shared_count(shared_count<Y, VoidAllocator, Deleter> const & r)
      :  m_px(r.m_px), m_pi(r.m_pi) // nothrow
   {  if( m_pi != 0 ) m_pi->add_ref_copy();  }

   //this is a test
   template<class Y>
   explicit shared_count(const pointer & ptr, shared_count<Y, VoidAllocator, Deleter> const & r)
      :  m_px(ptr), m_pi(r.m_pi) // nothrow
   {  if( m_pi != 0 ) m_pi->add_ref_copy();  }

/*
   explicit shared_count(weak_count<Y, VoidAllocator, Deleter> const & r)
      // throws bad_weak_ptr when r.use_count() == 0
      : m_pi( r.m_pi )
   {
      if( m_pi == 0 || !m_pi->add_ref_lock() ){
         boost::throw_exception( boost::interprocess::bad_weak_ptr() );
      }
   }
*/
   template<class Y>
   explicit shared_count(weak_count<Y, VoidAllocator, Deleter> const & r)
      // throws bad_weak_ptr when r.use_count() == 0
      : m_px(r.m_px), m_pi( r.m_pi )
   {
      if( m_pi == 0 || !m_pi->add_ref_lock() ){
         throw( boost::interprocess::bad_weak_ptr() );
      }
   }

   const pointer &to_raw_pointer() const
   {  return m_px;   }

   pointer &to_raw_pointer()
   {  return m_px;   }

   shared_count & operator= (shared_count const & r) // nothrow
   {
      m_px = r.m_px;
      counted_impl_ptr tmp = r.m_pi;
      if( tmp != m_pi ){
         if(tmp != 0)   tmp->add_ref_copy();
         if(m_pi != 0)  m_pi->release();
         m_pi = tmp;
      }
      return *this;
   }

   template<class Y>
   shared_count & operator= (shared_count<Y, VoidAllocator, Deleter> const & r) // nothrow
   {
      m_px = r.m_px;
      counted_impl_ptr tmp = r.m_pi;
      if( tmp != m_pi ){
         if(tmp != 0)   tmp->add_ref_copy();
         if(m_pi != 0)  m_pi->release();
         m_pi = tmp;
      }
      return *this;
   }

   void swap(shared_count & r) // nothrow
   {  ipcdetail::do_swap(m_px, r.m_px);   ipcdetail::do_swap(m_pi, r.m_pi);   }

   long use_count() const // nothrow
   {  return m_pi != 0? m_pi->use_count(): 0;  }

   bool unique() const // nothrow
   {  return use_count() == 1;   }

   const_deleter_pointer get_deleter() const
   {  return m_pi ? m_pi->get_deleter() : 0; }

//   const_allocator_pointer get_allocator() const
//   {  return m_pi ? m_pi->get_allocator() : 0; }

   template<class T2, class VoidAllocator2, class Deleter2>
   bool internal_equal (shared_count<T2, VoidAllocator2, Deleter2> const & other) const
   {  return this->m_pi == other.m_pi;   }

   template<class T2, class VoidAllocator2, class Deleter2>
   bool internal_less  (shared_count<T2, VoidAllocator2, Deleter2> const & other) const
   {  return std::less<counted_base_ptr>()(this->m_pi, other.m_pi);  }
};

template<class T, class VoidAllocator, class Deleter, class T2, class VoidAllocator2, class Deleter2> inline
bool operator==(shared_count<T, VoidAllocator, Deleter> const & a, shared_count<T2, VoidAllocator2, Deleter2> const & b)
{  return a.internal_equal(b);  }

template<class T, class VoidAllocator, class Deleter, class T2, class VoidAllocator2, class Deleter2> inline
bool operator<(shared_count<T, VoidAllocator, Deleter> const & a, shared_count<T2, VoidAllocator2, Deleter2> const & b)
{  return a.internal_less(b);   }


template<class T, class VoidAllocator, class Deleter>
class weak_count
{
   public:
   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<T>::type                         pointer;

   private:

   typedef sp_counted_impl_pd<VoidAllocator, Deleter>                counted_impl;

   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<counted_impl>::type                          counted_impl_ptr;
   typedef typename boost::intrusive::
      pointer_traits<typename VoidAllocator::pointer>::template
         rebind_pointer<sp_counted_base>::type                       counted_base_ptr;

   pointer           m_px;
   counted_impl_ptr  m_pi;

   template <class T2, class VoidAllocator2, class Deleter2>
   friend class weak_count;

   template <class T2, class VoidAllocator2, class Deleter2>
   friend class shared_count;

   public:

   weak_count(): m_px(0), m_pi(0) // nothrow
   {}

   template <class Y>
   explicit weak_count(shared_count<Y, VoidAllocator, Deleter> const & r)
      :  m_px(r.m_px), m_pi(r.m_pi) // nothrow
   {  if(m_pi != 0) m_pi->weak_add_ref(); }

   weak_count(weak_count const & r)
      :  m_px(r.m_px), m_pi(r.m_pi) // nothrow
   {  if(m_pi != 0) m_pi->weak_add_ref(); }

   template<class Y>
   weak_count(weak_count<Y, VoidAllocator, Deleter> const & r)
      : m_px(r.m_px), m_pi(r.m_pi) // nothrow
   {  if(m_pi != 0) m_pi->weak_add_ref(); }

   ~weak_count() // nothrow
   {  if(m_pi != 0) m_pi->weak_release(); }

   template<class Y>
   weak_count & operator= (shared_count<Y, VoidAllocator, Deleter> const & r) // nothrow
   {
      m_px = r.m_px;
      counted_impl_ptr tmp = r.m_pi;
      if(tmp != 0)   tmp->weak_add_ref();
      if(m_pi != 0)  m_pi->weak_release();
      m_pi = tmp;
      return *this;
   }

   weak_count & operator= (weak_count const & r) // nothrow
   {
      counted_impl_ptr tmp = r.m_pi;
      if(tmp != 0) tmp->weak_add_ref();
      if(m_pi != 0) m_pi->weak_release();
      m_pi = tmp;
      return *this;
   }

   void set_pointer(const pointer &ptr)
   {  m_px = ptr; }

   template<class Y>
   weak_count & operator= (weak_count<Y, VoidAllocator, Deleter> const& r) // nothrow
   {
      counted_impl_ptr tmp = r.m_pi;
      if(tmp != 0) tmp->weak_add_ref();
      if(m_pi != 0) m_pi->weak_release();
      m_pi = tmp;
      return *this;
   }

   void swap(weak_count & r) // nothrow
   {  ipcdetail::do_swap(m_px, r.m_px);  ipcdetail::do_swap(m_pi, r.m_pi);   }

   long use_count() const // nothrow
   {  return m_pi != 0? m_pi->use_count() : 0;   }

   template<class T2, class VoidAllocator2, class Deleter2>
   bool internal_equal (weak_count<T2, VoidAllocator2, Deleter2> const & other) const
   {  return this->m_pi == other.m_pi;   }

   template<class T2, class VoidAllocator2, class Deleter2>
   bool internal_less (weak_count<T2, VoidAllocator2, Deleter2> const & other) const
   {  return std::less<counted_base_ptr>()(this->m_pi, other.m_pi);  }
};

template<class T, class VoidAllocator, class Deleter, class T2, class VoidAllocator2, class Deleter2> inline
bool operator==(weak_count<T, VoidAllocator, Deleter> const & a, weak_count<T2, VoidAllocator2, Deleter2> const & b)
{  return a.internal_equal(b);  }

template<class T, class VoidAllocator, class Deleter, class T2, class VoidAllocator2, class Deleter2> inline
bool operator<(weak_count<T, VoidAllocator, Deleter> const & a, weak_count<T2, VoidAllocator2, Deleter2> const & b)
{  return a.internal_less(b);   }

} // namespace ipcdetail
} // namespace interprocess
} // namespace boost


#include <boost/interprocess/detail/config_end.hpp>


#endif  // #ifndef BOOST_INTERPROCESS_DETAIL_SHARED_COUNT_HPP_INCLUDED