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_cached_adaptive_pool
13#include <boost/interprocess/managed_shared_memory.hpp>
14#include <boost/interprocess/allocators/cached_adaptive_pool.hpp>
15#include <cassert>
16//<-
17#include "../test/get_process_id_name.hpp"
18//->
19
20using namespace boost::interprocess;
21
22int 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(filename: test::get_process_id_name()); }
30 ~shm_remove(){ shared_memory_object::remove(filename: 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,test::get_process_id_name(), 65536);
47 #else
48 //->
49 managed_shared_memory segment(create_only,
50 "MySharedMemory", //segment name
51 65536);
52 //<-
53 #endif
54 //->
55
56 //Create a cached_adaptive_pool that allocates ints from the managed segment
57 //The number of chunks per segment is the default value
58 typedef cached_adaptive_pool<int, managed_shared_memory::segment_manager>
59 cached_adaptive_pool_t;
60 cached_adaptive_pool_t allocator_instance(segment.get_segment_manager());
61
62 //The max cached nodes are configurable per instance
63 allocator_instance.set_max_cached_nodes(3);
64
65 //Create another cached_adaptive_pool. Since the segment manager address
66 //is the same, this cached_adaptive_pool will be
67 //attached to the same pool so "allocator_instance2" can deallocate
68 //nodes allocated by "allocator_instance"
69 cached_adaptive_pool_t allocator_instance2(segment.get_segment_manager());
70
71 //The max cached nodes are configurable per instance
72 allocator_instance2.set_max_cached_nodes(5);
73
74 //Create another cached_adaptive_pool using copy-constructor. This
75 //cached_adaptive_pool will also be attached to the same pool
76 cached_adaptive_pool_t allocator_instance3(allocator_instance2);
77
78 //We can clear the cache
79 allocator_instance3.deallocate_cache();
80
81 //All allocators are equal
82 assert(allocator_instance == allocator_instance2);
83 assert(allocator_instance2 == allocator_instance3);
84
85 //So memory allocated with one can be deallocated with another
86 allocator_instance2.deallocate(ptr: allocator_instance.allocate(count: 1), count: 1);
87 allocator_instance3.deallocate(ptr: allocator_instance2.allocate(count: 1), count: 1);
88
89 //The common pool will be destroyed here, since no allocator is
90 //attached to the pool
91 return 0;
92}
93//]
94
95

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