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: 2009-09-23 20:52:57

I did the needful for construction and destruction but it does not seem to be
working. May i know what is the pblm.

Thanks in advance.

manish4gupta wrote:
> 
> #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
>> _______________________________________________
>> Boost-users mailing list
>> Boost-users_at_[hidden]
>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>> 
> 
> 

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