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 #include <boost/interprocess/detail/config_begin.hpp>
11 #include <boost/interprocess/detail/workaround.hpp>
12 //[doc_spawn_vector
13 #include <boost/interprocess/managed_shared_memory.hpp>
14 #include <boost/interprocess/containers/vector.hpp>
15 #include <boost/interprocess/allocators/allocator.hpp>
16 #include <string>
17 #include <cstdlib> //std::system
18 //<-
19 #include "../test/get_process_id_name.hpp"
20 //->
21
22 using namespace boost::interprocess;
23
24 //Define an STL compatible allocator of ints that allocates from the managed_shared_memory.
25 //This allocator will allow placing containers in the segment
26 typedef allocator<int, managed_shared_memory::segment_manager> ShmemAllocator;
27
28 //Alias a vector that uses the previous STL-like allocator so that allocates
29 //its values from the segment
30 typedef vector<int, ShmemAllocator> MyVector;
31
32 //Main function. For parent process argc == 1, for child process argc == 2
main(int argc,char * argv[])33 int main(int argc, char *argv[])
34 {
35 if(argc == 1){ //Parent process
36 //Remove shared memory on construction and destruction
37 struct shm_remove
38 {
39 //<-
40 #if 1
41 shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
42 ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
43 #else
44 //->
45 shm_remove() { shared_memory_object::remove("MySharedMemory"); }
46 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
47 //<-
48 #endif
49 //->
50 } remover;
51 //<-
52 (void)remover;
53 //->
54
55 //Create a new segment with given name and size
56 //<-
57 #if 1
58 managed_shared_memory segment(create_only, test::get_process_id_name(), 65536);
59 #else
60 //->
61 managed_shared_memory segment(create_only, "MySharedMemory", 65536);
62 //<-
63 #endif
64 //->
65
66 //Initialize shared memory STL-compatible allocator
67 const ShmemAllocator alloc_inst (segment.get_segment_manager());
68
69 //Construct a vector named "MyVector" in shared memory with argument alloc_inst
70 MyVector *myvector = segment.construct<MyVector>("MyVector")(alloc_inst);
71
72 for(int i = 0; i < 100; ++i) //Insert data in the vector
73 myvector->push_back(i);
74
75 //Launch child process
76 std::string s(argv[0]); s += " child ";
77 //<-
78 s += test::get_process_id_name();
79 //->
80 if(0 != std::system(s.c_str()))
81 return 1;
82
83 //Check child has destroyed the vector
84 if(segment.find<MyVector>("MyVector").first)
85 return 1;
86 }
87 else{ //Child process
88 //Open the managed segment
89 //<-
90 #if 1
91 managed_shared_memory segment(open_only, argv[2]);
92 #else
93 //->
94 managed_shared_memory segment(open_only, "MySharedMemory");
95 //<-
96 #endif
97 //->
98
99 //Find the vector using the c-string name
100 MyVector *myvector = segment.find<MyVector>("MyVector").first;
101
102 //Use vector in reverse order
103 std::sort(myvector->rbegin(), myvector->rend());
104
105 //When done, destroy the vector from the segment
106 segment.destroy<MyVector>("MyVector");
107 }
108
109 return 0;
110 }
111
112 //]
113 #include <boost/interprocess/detail/config_end.hpp>
114