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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.

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

#include <boost/interprocess/detail/config_begin.hpp>

#include <boost/interprocess/detail/workaround.hpp>

#if defined(BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)

//[doc_xsi_shared_memory

#include <boost/interprocess/xsi_shared_memory.hpp>

#include <boost/interprocess/mapped_region.hpp>

#include <cstring>

#include <cstdlib>

#include <string>

using namespace boost::interprocess;

void remove_old_shared_memory(const xsi_key &key)

{

try{

xsi_shared_memory xsi(open_only, key);

xsi_shared_memory::remove(xsi.get_shmid());

}

catch(interprocess_exception &e){

if(e.get_error_code() != not_found_error)

throw;

}

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

{

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

//Build XSI key (ftok based)

xsi_key key(argv[0], 1);

remove_old_shared_memory(key);

//Create a shared memory object.

xsi_shared_memory shm (create_only, key, 1000);

//Remove shared memory on destruction

struct shm_remove

{

int shmid_;

shm_remove(int shmid) : shmid_(shmid){}

~shm_remove(){ xsi_shared_memory::remove(shmid_); }

} remover(shm.get_shmid());

//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 ";

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

return 1;

}

else{

//Build XSI key (ftok based)

xsi_key key(argv[0], 1);

//Create a shared memory object.

xsi_shared_memory shm (open_only, key);

//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;

}

//]

#else //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS

int main()

{

return 0;

}

#endif //BOOST_INTERPROCESS_XSI_SHARED_MEMORY_OBJECTS

#include <boost/interprocess/detail/config_end.hpp>

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