107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (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>
|
|
//[doc_ipc_message
|
|
#include <boost/interprocess/managed_shared_memory.hpp>
|
|
#include <cstdlib> //std::system
|
|
#include <sstream>
|
|
//<-
|
|
#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
|
|
{
|
|
//<-
|
|
#if 1
|
|
shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
|
|
~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
|
|
#else
|
|
//->
|
|
shm_remove() { shared_memory_object::remove("MySharedMemory"); }
|
|
~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
|
|
//<-
|
|
#endif
|
|
//->
|
|
} remover;
|
|
//<-
|
|
(void)remover;
|
|
//->
|
|
|
|
//Create a managed shared memory segment
|
|
//<-
|
|
#if 1
|
|
managed_shared_memory segment(create_only, test::get_process_id_name(), 65536);
|
|
#else
|
|
//->
|
|
managed_shared_memory segment(create_only, "MySharedMemory", 65536);
|
|
//<-
|
|
#endif
|
|
//->
|
|
|
|
//Allocate a portion of the segment (raw memory)
|
|
managed_shared_memory::size_type free_memory = segment.get_free_memory();
|
|
void * shptr = segment.allocate(1024/*bytes to allocate*/);
|
|
|
|
//Check invariant
|
|
if(free_memory <= segment.get_free_memory())
|
|
return 1;
|
|
|
|
//An handle from the base address can identify any byte of the shared
|
|
//memory segment even if it is mapped in different base addresses
|
|
managed_shared_memory::handle_t handle = segment.get_handle_from_address(shptr);
|
|
std::stringstream s;
|
|
s << argv[0] << " " << handle;
|
|
//<-
|
|
s << " " << test::get_process_id_name();
|
|
//->
|
|
s << std::ends;
|
|
//Launch child process
|
|
if(0 != std::system(s.str().c_str()))
|
|
return 1;
|
|
//Check memory has been freed
|
|
if(free_memory != segment.get_free_memory())
|
|
return 1;
|
|
}
|
|
else{
|
|
//Open managed segment
|
|
//<-
|
|
#if 1
|
|
managed_shared_memory segment(open_only, argv[2]);
|
|
#else
|
|
//->
|
|
managed_shared_memory segment(open_only, "MySharedMemory");
|
|
//<-
|
|
#endif
|
|
//->
|
|
|
|
//An handle from the base address can identify any byte of the shared
|
|
//memory segment even if it is mapped in different base addresses
|
|
managed_shared_memory::handle_t handle = 0;
|
|
|
|
//Obtain handle value
|
|
std::stringstream s; s << argv[1]; s >> handle;
|
|
|
|
//Get buffer local address from handle
|
|
void *msg = segment.get_address_from_handle(handle);
|
|
|
|
//Deallocate previously allocated memory
|
|
segment.deallocate(msg);
|
|
}
|
|
return 0;
|
|
}
|
|
//]
|
|
#include <boost/interprocess/detail/config_end.hpp>
|