ceph/src/boost/libs/interprocess/example/doc_windows_shared_memory.cpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/interprocess for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10 #include <boost/interprocess/detail/config_begin.hpp>
  11 #include <boost/interprocess/detail/workaround.hpp>
  12
  13 #if defined(BOOST_INTERPROCESS_WINDOWS) || defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
  14
  15 //[doc_windows_shared_memory
  16 #include <boost/interprocess/windows_shared_memory.hpp>
  17 #include <boost/interprocess/mapped_region.hpp>
  18 #include <cstring>
  19 #include <cstdlib>
  20 #include <string>
  21 //<-
  22 #include "../test/get_process_id_name.hpp"
  23 //->
  24
  25 int main(int argc, char *argv[])
  26 {
  27    using namespace boost::interprocess;
  28
  29    if(argc == 1){  //Parent process
  30       //Create a native windows shared memory object.
  31       //<-
  32       #if 1
  33       windows_shared_memory shm (create_only, test::get_process_id_name(), read_write, 1000);
  34       #else
  35       //->
  36       windows_shared_memory shm (create_only, "MySharedMemory", read_write, 1000);
  37       //<-
  38       #endif
  39       //->
  40
  41       //Map the whole shared memory in this process
  42       mapped_region region(shm, read_write);
  43
  44       //Write all the memory to 1
  45       std::memset(region.get_address(), 1, region.get_size());
  46
  47       //Launch child process
  48       std::string s(argv[0]); s += " child ";
  49       //<-
  50       s += test::get_process_id_name();
  51       //->
  52       if(0 != std::system(s.c_str()))
  53          return 1;
  54       //windows_shared_memory is destroyed when the last attached process dies...
  55    }
  56    else{
  57       //Open already created shared memory object.
  58       //<-
  59       #if 1
  60       windows_shared_memory shm (open_only, argv[2], read_only);
  61       #else
  62       //->
  63       windows_shared_memory shm (open_only, "MySharedMemory", read_only);
  64       //<-
  65       #endif
  66       //->
  67
  68       //Map the whole shared memory in this process
  69       mapped_region region(shm, read_only);
  70
  71       //Check that memory was initialized to 1
  72       char *mem = static_cast<char*>(region.get_address());
  73       for(std::size_t i = 0; i < region.get_size(); ++i)
  74          if(*mem++ != 1)
  75             return 1;   //Error checking memory
  76       return 0;
  77    }
  78    return 0;
  79 }
  80 //]
  81
  82 #else //BOOST_INTERPROCESS_WINDOWS
  83
  84 int main()
  85 {
  86    return 0;
  87 }
  88
  89 #endif //BOOST_INTERPROCESS_WINDOWS
  90
  91 #include <boost/interprocess/detail/config_end.hpp>