Re: [Boost-users] How to Read the stored memory map in C++

Subject: Re: [Boost-users] How to Read the stored memory map in C++
From: manish4gupta (manish_at_[hidden])
Date: 2009-09-22 20:47:44

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <iostream>

using namespace boost::interprocess;

//Typedefs of allocators and containers
typedef managed_shared_memory::segment_manager                      
segment_manager_t;
typedef allocator<void, segment_manager_t>                          
void_allocator;
typedef allocator<int, segment_manager_t>                           
int_allocator;
typedef vector<int, int_allocator>                                  
int_vector;
typedef allocator<int_vector, segment_manager_t>                    
int_vector_allocator;
typedef vector<int_vector, int_vector_allocator>                    
int_vector_vector;
typedef allocator<char, segment_manager_t>                          
char_allocator;
typedef basic_string<char, std::char_traits<char>, char_allocator>  
char_string;

class complex_data
{
   int               id_;
   char_string       char_string_;
   int_vector_vector int_vector_vector_;

   public:
   //Since void_allocator is convertible to any other allocator<T>, we can
simplify
   //the initialization taking just one allocator for all inner containers.
   complex_data(int id, const char *name, const void_allocator &void_alloc)
      : id_(id), char_string_(name, void_alloc),
int_vector_vector_(void_alloc)
   {}
   //Other members...
};

//Definition of the map holding a string as key and complex_data as mapped
type
typedef std::pair<const char_string, int>                     
map_value_type;
typedef std::pair<char_string, int>                           
movable_to_map_value_type;
typedef allocator<map_value_type, segment_manager_t>                   
map_value_type_allocator;
typedef map< char_string, int
           , std::less<char_string>, map_value_type_allocator>         
complex_map_type;

int main ()
{
   //Remove shared memory on construction and destruction
   struct shm_remove
   {
      shm_remove() { shared_memory_object::remove("MySharedMemory"); }
      ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
   } remover;

   //Create shared memory
   managed_shared_memory segment(create_only,"MySharedMemory", 65536);

   //An allocator convertible to any allocator<T, segment_manager_t> type
   void_allocator alloc_inst (segment.get_segment_manager());

   //Construct the shared memory map and fill it
   complex_map_type *mymap = segment.construct<complex_map_type>
      //(object name), (first ctor parameter, second ctor parameter)
         ("MyMap")(std::less<char_string>(), alloc_inst);
std::string s = "test";
char_string cs(s.c_str(), alloc_inst);
//string y (cs.c_str());
//std::cout << y <<"\n";

// = (char_string)s;
 
   for(int i = 0; i < 100; ++i)
   {
       mymap->insert(std::pair<char_string, int>(cs , i));
      //char_string  key_object(alloc_inst);
      //map_value_type value(key_object, i);
     // mymap->insert(value);
   }
   shared_memory_object::remove("MySharedMemory"); 
   return 0;
}

Now i have added the line  shared_memory_object::remove("MySharedMemory") in
process1  to remove the shared memory but still error is same.

Christoph Gysin-3 wrote:
> 
>> Â  //Remove shared memory on construction and destruction
>> Â  struct shm_remove
>> Â  {
>> Â  Â  Â shm_remove() { shared_memory_object::remove("MySharedMemory"); }
>> Â  Â  Â ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
>> Â  } remover;
> 
> You tell Process1 to clean it up on exit.
> 
> Chris
> -- 
> echo mailto: NOSPAM !#$.'<*>'|sed 's. ..'|tr "<*> !#:2" org_at_fr33z3
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