Simple Boost.Interprocess Demo

example_client.cpp

#include <boost/interprocess/managed_shared_memory.hpp>
#include <cstdlib>
#include <sstream>

int main(int argc, char** argv)
{
  namespace ip = boost::interprocess;

  ip::managed_shared_memory segment(ip::open_only, "Erik");

  ip::managed_shared_memory::handle_t handle = 0;

  std::stringstream s;
  s << argv[1]; 
  s >> handle;

  void* message = segment.get_address_from_handle(handle);

  printf("Message: %s\n", (char*)message);

  segment.deallocate(message);
  
  return EXIT_SUCCESS;
}

example_server.cpp

#include <boost/interprocess/managed_shared_memory.hpp>
#include <cstdlib>
#include <sstream>

#define ALLOC_BYTES 1024

int main()
{
  namespace ip = boost::interprocess;
  struct shm_remove
  {
    shm_remove() { ip::shared_memory_object::remove("Erik"); }
    ~shm_remove() { ip::shared_memory_object::remove("Erik"); }
  } remover;

  ip::managed_shared_memory segment(ip::create_only, "Erik", 32768);

  std::size_t free_memory = segment.get_free_memory();
  void * shptr = segment.allocate(ALLOC_BYTES);

  if(free_memory <= segment.get_free_memory())
  {
    return EXIT_FAILURE;
  }

  strcpy((char*)shptr, "Manatees!");

  ip::managed_shared_memory::handle_t handle = 
              segment.get_handle_from_address(shptr);

  std::cout << "Handle is " << handle << std::endl;
  pause();
  
  return EXIT_SUCCESS;
}

Makefile

CFLAGS=-O3 -Wall
TARGETS=example1_server example1_client
all: $(TARGETS)

example1_server: example1_server.cpp
	$(CXX) $(CFLAGS) -o $@ $<

example1_client: example1_client.cpp
	$(CXX) $(CFLAGS) -o $@ $<

clean: 
	rm -f $(TARGETS)

OUTPUT

hank@shelob ~/repos/life/code/cpp/boost/interproc $ ./example1_server &
[1] 55037
hank@shelob ~/repos/life/code/cpp/boost/interproc $ Handle is 192

hank@shelob ~/repos/life/code/cpp/boost/interproc $ ./example1_client 192
Message: Manatees!