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
|
//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2012.
// 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.
//
//////////////////////////////////////////////////////////////////////////////
#include <boost/interprocess/detail/workaround.hpp>
//[doc_shared_ptr_explicit
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/smart_ptr/shared_ptr.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/smart_ptr/deleter.hpp>
#include <cassert>
//<-
#include "../test/get_process_id_name.hpp"
//->
using namespace boost::interprocess;
//This is type of the object we want to share
class MyType
{};
typedef managed_shared_memory::segment_manager segment_manager_type;
typedef allocator<void, segment_manager_type> void_allocator_type;
typedef deleter<MyType, segment_manager_type> deleter_type;
typedef shared_ptr<MyType, void_allocator_type, deleter_type> my_shared_ptr;
int main ()
{
//Remove shared memory on construction and destruction
struct shm_remove
{
//<-
#if 1
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
#else
//->
shm_remove() { shared_memory_object::remove("MySharedMemory"); }
~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
//<-
#endif
//->
} remover;
//<-
(void)remover;
//->
//<-
#if 1
managed_shared_memory segment(create_only, test::get_process_id_name(), 4096);
#else
//->
managed_shared_memory segment(create_only, "MySharedMemory", 4096);
//<-
#endif
//->
//Create a shared pointer in shared memory
//pointing to a newly created object in the segment
my_shared_ptr &shared_ptr_instance =
*segment.construct<my_shared_ptr>("shared ptr")
//Arguments to construct the shared pointer
( segment.construct<MyType>("object to share")() //object to own
, void_allocator_type(segment.get_segment_manager()) //allocator
, deleter_type(segment.get_segment_manager()) //deleter
);
assert(shared_ptr_instance.use_count() == 1);
//Destroy "shared ptr". "object to share" will be automatically destroyed
segment.destroy_ptr(&shared_ptr_instance);
return 0;
}
//]
|
