Re: [Boost-users] Information about create_only and open_or_create

Subject: Re: [Boost-users] Information about create_only and open_or_create
From: manish4gupta (manish_at_[hidden])
Date: 2009-10-22 22:46:07

Process1.cpp

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/map.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <iostream>
#include <vector>
#include <fstream>
using namespace boost::interprocess;
typedef managed_shared_memory::segment_manager segment_manager_t;
typedef allocator<void, segment_manager_t> void_allocator;
typedef allocator<char, segment_manager_t> char_allocator;
typedef basic_string<char, std::char_traits<char>, char_allocator>
char_string;
typedef std::pair<const char_string, char_string> map_value_type;
typedef allocator<map_value_type, segment_manager_t> 
map_value_type_allocator;
typedef multimap< char_string, char_string, std::less<char_string>,
map_value_type_allocator>  complex_map_type;

std::string trim(const char *str)
{
   std::string ptr;
   int i,j=0;
   for(i=0;str[i]!='\0';i++)
   {
      if (str[i] != ' ' && str[i] != '\t')
         ptr += str[i];
   }
   return ptr;
}

int main (int argc, char* argv[])
{
   using namespace std;
   const char* MySharedMemory= "MySharedMemory";
   shared_memory_object::remove(MySharedMemory);               // It works
fine but when put on comment then 

   managed_shared_memory segment(open_or_create,MySharedMemory, 999999999);
   void_allocator alloc_inst (segment.get_segment_manager());
   complex_map_type *mymap =
segment.construct<complex_map_type>("MyMap")(std::less<char_string>(),
alloc_inst);
  std::cout << mymap->size() << std::endl;
   ifstream in(argv[1]);
   char line[1000];
   char recline[100];
   int index = 0;
   while(in)
   {
     in.getline(line,1000);
     int len = strlen(line);
     strcpy(recline,line);
     if(in)
     {
        std::stringstream ss;
        //std::cout << index << endl;
        ss<< index;
        char name[1000];
        strcpy(name, "1:");
        std::cout << name << endl;
        char* pch;
        pch = strtok(line,"\t");
        vector <const char*> vec;
        while(pch != NULL)
        {
          vec.push_back(pch);
          pch = strtok(NULL,"\t");
        }
        std::string y = trim(vec[vec.size()-1]);
        std::cout << y << endl;
        char_string cs(y.c_str(), alloc_inst);
        strcat(name, (ss.str()).c_str());
        char_string indexvalue(name, alloc_inst);
        std::cout << cs << "\t" << indexvalue  << std::endl;
        mymap->insert(std::pair<char_string, char_string>(cs,indexvalue));
        index += len;
        index += 1;
     }
}
   return 0;
}

It works fine if i create a new sharedmemroy and use it but when i run this
code again by putting comment on 
shared_memory_object::remove(MySharedMemory) to use the existing
Sharedmemory and map in it.
Exception 
terminate called after throwing an instance of
'boost::interprocess::interprocess_exception'
  what():  boost::interprocess_exception::library_error
Aborted

What is the reason for this? And how can i overcome such pblm? Thanks in
advance.  

Christoph Gysin-3 wrote:
> 
> 2009/10/22 manish4gupta <manish_at_[hidden]>:
>> I am working on shared memory. I am successful in using it but I am
>> trying
> 
> Please provide more detailed information about your problem. Add a
> short (compilable) example demonstrating the problem, including the
> complete error message. Also provide information about your operating
> system, compiler, etc...
> 
> Don't just post the same question again. Thanks.
> 
> Chris
> -- 
> echo mailto: NOSPAM !#$.'<*>'|sed 's. ..'|tr "<*> !#:2" org_at_fr33z3
> _______________________________________________
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> Boost-users_at_[hidden]
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> 
> 

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