| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2006-2009. 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; |
| |
| //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) |
| std::size_t 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> |