1//////////////////////////////////////////////////////////////////////////////
2//
3// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
4// Software License, Version 1.0. (See accompanying file
5// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6//
7// See http://www.boost.org/libs/interprocess for documentation.
8//
9//////////////////////////////////////////////////////////////////////////////
10
11#include <boost/interprocess/detail/workaround.hpp>
12//[doc_named_alloc
13#include <boost/interprocess/managed_shared_memory.hpp>
14#include <cstdlib> //std::system
15#include <cstddef>
16#include <cassert>
17#include <utility>
18//<-
19#include "../test/get_process_id_name.hpp"
20//->
21
22int main(int argc, char *argv[])
23{
24 using namespace boost::interprocess;
25 typedef std::pair<double, int> MyType;
26
27 if(argc == 1){ //Parent process
28 //Remove shared memory on construction and destruction
29 struct shm_remove
30 {
31 //<-
32 #if 1
33 shm_remove() { shared_memory_object::remove(filename: test::get_process_id_name()); }
34 ~shm_remove(){ shared_memory_object::remove(filename: test::get_process_id_name()); }
35 #else
36 //->
37 shm_remove() { shared_memory_object::remove("MySharedMemory"); }
38 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
39 //<-
40 #endif
41 //->
42 } remover;
43 //<-
44 (void)remover;
45 //->
46
47 //Construct managed shared memory
48 //<-
49 #if 1
50 managed_shared_memory segment(create_only, test::get_process_id_name(), 65536);
51 #else
52 //->
53 managed_shared_memory segment(create_only, "MySharedMemory", 65536);
54 //<-
55 #endif
56 //->
57
58 //Create an object of MyType initialized to {0.0, 0}
59 MyType *instance = segment.construct<MyType>
60 (name: "MyType instance") //name of the object
61 (0.0, 0); //ctor first argument
62
63 //Create an array of 10 elements of MyType initialized to {0.0, 0}
64 MyType *array = segment.construct<MyType>
65 (name: "MyType array") //name of the object
66 [10] //number of elements
67 (0.0, 0); //Same two ctor arguments for all objects
68
69 //Create an array of 3 elements of MyType initializing each one
70 //to a different value {0.0, 0}, {1.0, 1}, {2.0, 2}...
71 float float_initializer[3] = { 0.0, 1.0, 2.0 };
72 int int_initializer[3] = { 0, 1, 2 };
73
74 MyType *array_it = segment.construct_it<MyType>
75 (name: "MyType array from it") //name of the object
76 [3] //number of elements
77 ( &float_initializer[0] //Iterator for the 1st ctor argument
78 , &int_initializer[0]); //Iterator for the 2nd ctor argument
79
80 //Launch child process
81 std::string s(argv[0]); s += " child ";
82 //<-
83 s += test::get_process_id_name();
84 //->
85 if(0 != std::system(command: s.c_str()))
86 return 1;
87
88 //<-
89 (void)instance;
90 (void)array;
91 (void)array_it;
92 //->
93
94 //Check child has destroyed all objects
95 if(segment.find<MyType>(name: "MyType array").first ||
96 segment.find<MyType>(name: "MyType instance").first ||
97 segment.find<MyType>(name: "MyType array from it").first)
98 return 1;
99 }
100 else{
101 //Open managed shared memory
102 //<-
103 #if 1
104 managed_shared_memory segment(open_only, argv[2]);
105 #else
106 //->
107 managed_shared_memory segment(open_only, "MySharedMemory");
108 //<-
109 #endif
110 //->
111
112 std::pair<MyType*, managed_shared_memory::size_type> res;
113
114 //Find the array
115 res = segment.find<MyType> (name: "MyType array");
116 //Length should be 10
117 if(res.second != 10) return 1;
118
119 //Find the object
120 res = segment.find<MyType> (name: "MyType instance");
121 //Length should be 1
122 if(res.second != 1) return 1;
123
124 //Find the array constructed from iterators
125 res = segment.find<MyType> (name: "MyType array from it");
126 //Length should be 3
127 if(res.second != 3) return 1;
128
129 //We're done, delete all the objects
130 segment.destroy<MyType>(name: "MyType array");
131 segment.destroy<MyType>(name: "MyType instance");
132 segment.destroy<MyType>(name: "MyType array from it");
133 }
134 return 0;
135}
136//]
137
138

source code of boost/libs/interprocess/example/doc_named_alloc.cpp