| 1 | ////////////////////////////////////////////////////////////////////////////// |
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| 2 | // |
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| 3 | // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost |
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| 4 | // Software License, Version 1.0. (See accompanying file |
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| 5 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | // |
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| 7 | // See http://www.boost.org/libs/interprocess for documentation. |
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| 8 | // |
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| 9 | ////////////////////////////////////////////////////////////////////////////// |
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| 10 | |
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| 11 | #include <boost/interprocess/detail/workaround.hpp> |
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| 12 | //[doc_node_allocator |
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| 13 | #include <boost/interprocess/managed_shared_memory.hpp> |
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| 14 | #include <boost/interprocess/allocators/node_allocator.hpp> |
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| 15 | #include <cassert> |
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| 16 | //<- |
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| 17 | #include "../test/get_process_id_name.hpp" |
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| 18 | //-> |
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| 19 | |
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| 20 | using namespace boost::interprocess; |
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| 21 | |
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| 22 | int main () |
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| 23 | { |
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| 24 | //Remove shared memory on construction and destruction |
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| 25 | struct shm_remove |
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| 26 | { |
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| 27 | //<- |
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| 28 | #if 1 |
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| 29 | shm_remove() { shared_memory_object::remove(filename: test::get_process_id_name()); } |
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| 30 | ~shm_remove(){ shared_memory_object::remove(filename: test::get_process_id_name()); } |
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| 31 | #else |
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| 32 | //-> |
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| 33 | shm_remove() { shared_memory_object::remove("MySharedMemory" ); } |
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| 34 | ~shm_remove(){ shared_memory_object::remove("MySharedMemory" ); } |
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| 35 | //<- |
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| 36 | #endif |
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| 37 | //-> |
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| 38 | } remover; |
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| 39 | //<- |
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| 40 | (void)remover; |
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| 41 | //-> |
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| 42 | |
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| 43 | //Create shared memory |
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| 44 | //<- |
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| 45 | #if 1 |
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| 46 | managed_shared_memory segment(create_only, |
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| 47 | test::get_process_id_name(), //segment name |
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| 48 | 65536); |
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| 49 | #else |
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| 50 | //-> |
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| 51 | managed_shared_memory segment(create_only, |
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| 52 | "MySharedMemory" , //segment name |
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| 53 | 65536); |
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| 54 | //<- |
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| 55 | #endif |
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| 56 | //-> |
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| 57 | |
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| 58 | //Create a node_allocator that allocates ints from the managed segment |
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| 59 | //The number of chunks per segment is the default value |
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| 60 | typedef node_allocator<int, managed_shared_memory::segment_manager> |
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| 61 | node_allocator_t; |
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| 62 | node_allocator_t allocator_instance(segment.get_segment_manager()); |
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| 63 | |
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| 64 | //Create another node_allocator. Since the segment manager address |
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| 65 | //is the same, this node_allocator will be |
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| 66 | //attached to the same pool so "allocator_instance2" can deallocate |
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| 67 | //nodes allocated by "allocator_instance" |
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| 68 | node_allocator_t allocator_instance2(segment.get_segment_manager()); |
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| 69 | |
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| 70 | //Create another node_allocator using copy-constructor. This |
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| 71 | //node_allocator will also be attached to the same pool |
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| 72 | node_allocator_t allocator_instance3(allocator_instance2); |
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| 73 | |
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| 74 | //All allocators are equal |
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| 75 | assert(allocator_instance == allocator_instance2); |
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| 76 | assert(allocator_instance2 == allocator_instance3); |
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| 77 | |
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| 78 | //So memory allocated with one can be deallocated with another |
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| 79 | allocator_instance2.deallocate(ptr: allocator_instance.allocate(count: 1), count: 1); |
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| 80 | allocator_instance3.deallocate(ptr: allocator_instance2.allocate(count: 1), count: 1); |
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| 81 | |
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| 82 | //The common pool will be destroyed here, since no allocator is |
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| 83 | //attached to the pool |
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| 84 | return 0; |
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| 85 | } |
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| 86 | //] |
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| 87 | |
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| 88 | |
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