1 //////////////////////////////////////////////////////////////////////////////
3 // (C) Copyright Ion Gaztanaga 2006-2009. 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)
7 // See http://www.boost.org/libs/interprocess for documentation.
9 //////////////////////////////////////////////////////////////////////////////
10 #include <boost/interprocess/detail/config_begin.hpp>
11 #include <boost/interprocess/detail/workaround.hpp>
12 //[doc_cached_node_allocator
13 #include <boost/interprocess/managed_shared_memory.hpp>
14 #include <boost/interprocess/allocators/cached_node_allocator.hpp>
17 #include "../test/get_process_id_name.hpp"
20 using namespace boost::interprocess;
24 //Remove shared memory on construction and destruction
29 shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
30 ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
33 shm_remove() { shared_memory_object::remove("MySharedMemory"); }
34 ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
40 //Create shared memory
43 managed_shared_memory segment(create_only, test::get_process_id_name(), 65536);
46 managed_shared_memory segment(create_only,
47 "MySharedMemory", //segment name
53 //Create a cached_node_allocator that allocates ints from the managed segment
54 //The number of chunks per segment is the default value
55 typedef cached_node_allocator<int, managed_shared_memory::segment_manager>
56 cached_node_allocator_t;
57 cached_node_allocator_t allocator_instance(segment.get_segment_manager());
59 //The max cached nodes are configurable per instance
60 allocator_instance.set_max_cached_nodes(3);
62 //Create another cached_node_allocator. Since the segment manager address
63 //is the same, this cached_node_allocator will be
64 //attached to the same pool so "allocator_instance2" can deallocate
65 //nodes allocated by "allocator_instance"
66 cached_node_allocator_t allocator_instance2(segment.get_segment_manager());
68 //The max cached nodes are configurable per instance
69 allocator_instance2.set_max_cached_nodes(5);
71 //Create another cached_node_allocator using copy-constructor. This
72 //cached_node_allocator will also be attached to the same pool
73 cached_node_allocator_t allocator_instance3(allocator_instance2);
75 //We can clear the cache
76 allocator_instance3.deallocate_cache();
78 //All allocators are equal
79 assert(allocator_instance == allocator_instance2);
80 assert(allocator_instance2 == allocator_instance3);
82 //So memory allocated with one can be deallocated with another
83 allocator_instance2.deallocate(allocator_instance.allocate(1), 1);
84 allocator_instance3.deallocate(allocator_instance2.allocate(1), 1);
86 //The common pool will be destroyed here, since no allocator is
87 //attached to the pool
91 #include <boost/interprocess/detail/config_end.hpp>