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
|
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2004-2007. 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.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <cstdio>
#include <string>
#include "get_process_id_name.hpp"
using namespace boost::interprocess;
int main ()
{
const int ShmemSize = 65536;
const char *const ShmemName = test::get_process_id_name();
//STL compatible allocator object for memory-mapped shmem
typedef allocator<int, managed_shared_memory::segment_manager>
allocator_int_t;
//A vector that uses that allocator
typedef boost::interprocess::vector<int, allocator_int_t> MyVect;
{
//Remove the shmem it is already created
shared_memory_object::remove(ShmemName);
const int max = 100;
void *array[max];
//Named allocate capable shared memory allocator
managed_shared_memory shmem(create_only, ShmemName, ShmemSize);
int i;
//Let's allocate some memory
for(i = 0; i < max; ++i){
array[i] = shmem.allocate(i+1);
}
//Deallocate allocated memory
for(i = 0; i < max; ++i){
shmem.deallocate(array[i]);
}
}
{
//Remove the shmem it is already created
shared_memory_object::remove(ShmemName);
//Named allocate capable memory mapped shmem managed memory class
managed_shared_memory shmem(create_only, ShmemName, ShmemSize);
//Construct the STL-like allocator with the segment manager
const allocator_int_t myallocator (shmem.get_segment_manager());
//Construct vector
MyVect *shmem_vect = shmem.construct<MyVect> ("MyVector") (myallocator);
//Test that vector can be found via name
if(shmem_vect != shmem.find<MyVect>("MyVector").first)
return -1;
//Destroy and check it is not present
shmem.destroy<MyVect> ("MyVector");
if(0 != shmem.find<MyVect>("MyVector").first)
return -1;
//Construct a vector in the memory-mapped shmem
shmem_vect = shmem.construct<MyVect> ("MyVector") (myallocator);
}
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
//Check vector is still there
MyVect *shmem_vect = shmem.find<MyVect>("MyVector").first;
if(!shmem_vect)
return -1;
}
{
std::size_t old_free_memory;
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
old_free_memory = shmem.get_free_memory();
}
//Now grow the shmem
managed_shared_memory::grow(ShmemName, ShmemSize);
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
//Check vector is still there
MyVect *shmem_vect = shmem.find<MyVect>("MyVector").first;
if(!shmem_vect)
return -1;
if(shmem.get_size() != (ShmemSize*2))
return -1;
if(shmem.get_free_memory() <= old_free_memory)
return -1;
}
{
std::size_t old_free_memory, next_free_memory,
old_shmem_size, next_shmem_size, final_shmem_size;
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
old_free_memory = shmem.get_free_memory();
old_shmem_size = shmem.get_size();
}
//Now shrink the shmem
managed_shared_memory::shrink_to_fit(ShmemName);
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
next_shmem_size = shmem.get_size();
//Check vector is still there
MyVect *shmem_vect = shmem.find<MyVect>("MyVector").first;
if(!shmem_vect)
return -1;
next_free_memory = shmem.get_free_memory();
if(next_free_memory >= old_free_memory)
return -1;
if(old_shmem_size <= next_shmem_size)
return -1;
}
//Now destroy the vector
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
//Destroy and check it is not present
shmem.destroy<MyVect>("MyVector");
if(0 != shmem.find<MyVect>("MyVector").first)
return -1;
}
//Now shrink the shmem
managed_shared_memory::shrink_to_fit(ShmemName);
{
//Map preexisting shmem again in memory
managed_shared_memory shmem(open_only, ShmemName);
final_shmem_size = shmem.get_size();
if(next_shmem_size <= final_shmem_size)
return -1;
}
}
shared_memory_object::remove(ShmemName);
return 0;
}
#include <boost/interprocess/detail/config_end.hpp>
|
