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//////////////////////////////////////////////////////////////////////////////

// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost

// Software License, Version 1.0. (See accompanying file

// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// See http://www.boost.org/libs/interprocess for documentation.

//////////////////////////////////////////////////////////////////////////////

//[doc_shared_memory

#include <boost/interprocess/shared_memory_object.hpp>

#include <boost/interprocess/mapped_region.hpp>

#include <cstring>

#include <cstdlib>

#include <string>

//<-

#include "../test/get_process_id_name.hpp"

//->

int main(int argc, char *argv[])

{

using namespace boost::interprocess;

if(argc == 1){ //Parent process

//Remove shared memory on construction and destruction

struct shm_remove

{

shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }

~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }

} remover;

//<-

(void)remover;

//->

//Create a shared memory object.

shared_memory_object shm (create_only, test::get_process_id_name(), read_write);

//Set size

shm.truncate(1000);

//Map the whole shared memory in this process

mapped_region region(shm, read_write);

//Write all the memory to 1

std::memset(region.get_address(), 1, region.get_size());

//Launch child process

std::string s(argv[0]); s += " child ";

//<-

s += test::get_process_id_name();

//->

if(0 != std::system(s.c_str()))

return 1;

}

else{

//Open already created shared memory object.

shared_memory_object shm (open_only, test::get_argv_2(argv), read_only);

//Map the whole shared memory in this process

mapped_region region(shm, read_only);

//Check that memory was initialized to 1

char *mem = static_cast<char*>(region.get_address());

for(std::size_t i = 0; i < region.get_size(); ++i)

if(*mem++ != 1)

return 1; //Error checking memory

}

return 0;

}

//]