doc_ipc_messagea.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 56 行

//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2007. 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_messageA
#include <boost/interprocess/managed_shared_memory.hpp>

int main ()
{
   using namespace boost::interprocess;

   //A special shared memory from which we are
   //able to allocate raw memory buffers.
   //First remove any old shared memory of the same name, create 
   //the shared memory segment and initialize needed resources
   shared_memory_object::remove("MySharedMemory");
   try{
      managed_shared_memory segment
         (create_only, 
         "MySharedMemory",  //segment name
         65536);             //segment size in bytes

      //Allocate a portion of the segment
      void * shptr   = segment.allocate(1024/*bytes to allocate*/);

      //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);
      (void)handle;
      // Copy message to buffer
      // . . .
      // Send handle to other process
      // . . .
      // Wait response from other process
      // . . .

      //Deallocate the portion previously allocated
      segment.deallocate(shptr);
   }
   catch(...){
      shared_memory_object::remove("MySharedMemory");
      throw;
   }
   shared_memory_object::remove("MySharedMemory");
   return 0;
}
//]
#include <boost/interprocess/detail/config_end.hpp>