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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2011. 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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