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_private_node_allocator
13 #include <boost/interprocess/managed_shared_memory.hpp>
14 #include <boost/interprocess/allocators/private_node_allocator.hpp>
15 #include <cassert>
16 //<-
17 #include "../test/get_process_id_name.hpp"
18 //->
19 
20 using namespace boost::interprocess;
21 
main()22 int main ()
23 {
24    //Remove shared memory on construction and destruction
25    struct shm_remove
26    {
27    //<-
28    #if 1
29       shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
30       ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
31    #else
32    //->
33       shm_remove() { shared_memory_object::remove("MySharedMemory"); }
34       ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
35    //<-
36    #endif
37    //->
38    }  remover;
39    //<-
40    (void)remover;
41    //->
42 
43    //Create shared memory
44    //<-
45    #if 1
46    managed_shared_memory segment(create_only,
47                                  test::get_process_id_name(),  //segment name
48                                  65536);
49    #else
50    //->
51    managed_shared_memory segment(create_only,
52                                  "MySharedMemory",  //segment name
53                                  65536);
54    //<-
55    #endif
56    //->
57 
58    //Create a private_node_allocator that allocates ints from the managed segment
59    //The number of chunks per segment is the default value
60    typedef private_node_allocator<int, managed_shared_memory::segment_manager>
61       private_node_allocator_t;
62    private_node_allocator_t allocator_instance(segment.get_segment_manager());
63 
64    //Create another private_node_allocator.
65    private_node_allocator_t allocator_instance2(segment.get_segment_manager());
66 
67    //Although the segment manager address
68    //is the same, this private_node_allocator will have its own pool so
69    //"allocator_instance2" CAN'T deallocate nodes allocated by "allocator_instance".
70    //"allocator_instance2" is NOT equal to "allocator_instance"
71    assert(allocator_instance != allocator_instance2);
72 
73    //Create another node_allocator using copy-constructor.
74    private_node_allocator_t allocator_instance3(allocator_instance2);
75 
76    //This allocator is also unequal to allocator_instance2
77    assert(allocator_instance2 != allocator_instance3);
78 
79    //Pools are destroyed with the allocators
80    return 0;
81 }
82 //]
83 #include <boost/interprocess/detail/config_end.hpp>
84