ceph/src/boost/libs/interprocess/example/doc_private_adaptive_pool.cpp

   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_private_adaptive_pool
  13 #include <boost/interprocess/managed_shared_memory.hpp>
  14 #include <boost/interprocess/allocators/private_adaptive_pool.hpp>
  15 #include <cassert>
  16 //<-
  17 #include "../test/get_process_id_name.hpp"
  18 //->
  19
  20 using namespace boost::interprocess;
  21
  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_adaptive_pool that allocates ints from the managed segment
  59    //The number of chunks per segment is the default value
  60    typedef private_adaptive_pool<int, managed_shared_memory::segment_manager>
  61          private_adaptive_pool_t;
  62    private_adaptive_pool_t allocator_instance(segment.get_segment_manager());
  63
  64    //Create another private_adaptive_pool.
  65    private_adaptive_pool_t allocator_instance2(segment.get_segment_manager());
  66
  67    //Although the segment manager address
  68    //is the same, this private_adaptive_pool 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 adaptive_pool using copy-constructor.
  74    private_adaptive_pool_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