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
|
///////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2012. 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_EXPAND_BWD_TEST_ALLOCATOR_HPP
#define BOOST_INTERPROCESS_EXPAND_BWD_TEST_ALLOCATOR_HPP
#if defined (_MSC_VER)
# pragma once
#endif
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/interprocess/interprocess_fwd.hpp>
#include <boost/interprocess/containers/allocation_type.hpp>
#include <boost/assert.hpp>
#include <boost/interprocess/detail/utilities.hpp>
#include <boost/interprocess/containers/version_type.hpp>
#include <boost/interprocess/exceptions.hpp>
#include <boost/move/adl_move_swap.hpp>
#include <memory>
#include <cstddef>
#include <cassert>
#include <new>
//!\file
//!Describes an allocator to test expand capabilities
namespace boost {
namespace interprocess {
namespace test {
//This allocator just allows two allocations. The first one will return
//mp_buffer + m_offset configured in the constructor. The second one
//will return mp_buffer.
template<class T>
class expand_bwd_test_allocator
{
private:
typedef expand_bwd_test_allocator<T> self_t;
typedef void * aux_pointer_t;
typedef const void * cvoid_ptr;
template<class T2>
expand_bwd_test_allocator& operator=(const expand_bwd_test_allocator<T2>&);
expand_bwd_test_allocator& operator=(const expand_bwd_test_allocator&);
public:
typedef T value_type;
typedef T * pointer;
typedef const T * const_pointer;
typedef typename ipcdetail::add_reference
<value_type>::type reference;
typedef typename ipcdetail::add_reference
<const value_type>::type const_reference;
typedef std::size_t size_type;
typedef boost::interprocess::version_type<expand_bwd_test_allocator, 2> version;
//Dummy multiallocation chain
struct multiallocation_chain{};
template<class T2>
struct rebind
{ typedef expand_bwd_test_allocator<T2> other; };
//!Constructor from the segment manager. Never throws
expand_bwd_test_allocator(T *buf, size_type sz, size_type offset)
: mp_buffer(buf), m_size(sz)
, m_offset(offset), m_allocations(0){ }
//!Constructor from other expand_bwd_test_allocator. Never throws
expand_bwd_test_allocator(const expand_bwd_test_allocator &other)
: mp_buffer(other.mp_buffer), m_size(other.m_size)
, m_offset(other.m_offset), m_allocations(0){ }
//!Constructor from related expand_bwd_test_allocator. Never throws
template<class T2>
expand_bwd_test_allocator(const expand_bwd_test_allocator<T2> &other)
: mp_buffer(other.mp_buffer), m_size(other.m_size)
, m_offset(other.m_offset), m_allocations(0){ }
pointer address(reference value)
{ return pointer(addressof(value)); }
const_pointer address(const_reference value) const
{ return const_pointer(addressof(value)); }
pointer allocate(size_type , cvoid_ptr hint = 0)
{ (void)hint; return 0; }
void deallocate(const pointer &, size_type)
{}
template<class Convertible>
void construct(pointer ptr, const Convertible &value)
{ new((void*)ptr) value_type(value); }
void destroy(pointer ptr)
{ (*ptr).~value_type(); }
size_type max_size() const
{ return m_size; }
friend void swap(self_t &alloc1, self_t &alloc2)
{
::boost::adl_move_swap(alloc1.mp_buffer, alloc2.mp_buffer);
::boost::adl_move_swap(alloc1.m_size, alloc2.m_size);
::boost::adl_move_swap(alloc1.m_offset, alloc2.m_offset);
}
//Experimental version 2 expand_bwd_test_allocator functions
pointer allocation_command(boost::interprocess::allocation_type command,
size_type limit_size, size_type &prefer_in_recvd_out_size, pointer &reuse)
{
(void)reuse; (void)command;
//This allocator only expands backwards!
assert(m_allocations == 0 || (command & boost::interprocess::expand_bwd));
prefer_in_recvd_out_size = limit_size;
if(m_allocations == 0){
if((m_offset + limit_size) > m_size){
assert(0);
}
++m_allocations;
return mp_buffer + std::ptrdiff_t(m_offset);
}
else if(m_allocations == 1){
if(limit_size > m_size){
assert(0);
}
++m_allocations;
return mp_buffer;
}
else{
assert(0);
throw std::bad_alloc();
}
}
//!Returns maximum the number of objects the previously allocated memory
//!pointed by p can hold.
size_type size(const pointer &p) const
{ (void)p; return m_size; }
//!Allocates just one object. Memory allocated with this function
//!must be deallocated only with deallocate_one().
//!Throws boost::interprocess::bad_alloc if there is no enough memory
pointer allocate_one()
{ return this->allocate(1); }
//!Deallocates memory previously allocated with allocate_one().
//!You should never use deallocate_one to deallocate memory allocated
//!with other functions different from allocate_one(). Never throws
void deallocate_one(const pointer &p)
{ return this->deallocate(p, 1); }
pointer mp_buffer;
size_type m_size;
size_type m_offset;
char m_allocations;
};
//!Equality test for same type of expand_bwd_test_allocator
template<class T> inline
bool operator==(const expand_bwd_test_allocator<T> &,
const expand_bwd_test_allocator<T> &)
{ return false; }
//!Inequality test for same type of expand_bwd_test_allocator
template<class T> inline
bool operator!=(const expand_bwd_test_allocator<T> &,
const expand_bwd_test_allocator<T> &)
{ return true; }
} //namespace test {
} //namespace interprocess {
} //namespace boost {
#include <boost/interprocess/detail/config_end.hpp>
#endif //BOOST_INTERPROCESS_EXPAND_BWD_TEST_ALLOCATOR_HPP
|
