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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>
- //[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>
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