ceph/src/boost/libs/mpi/example/hello_world.cpp

   1 // Copyright (C) 2006 Douglas Gregor <doug.gregor@gmail.com>
   2
   3 // Use, modification and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 // A simple Hello, world! example using Boost.MPI message passing.
   8
   9 #include <boost/mpi.hpp>
  10 #include <iostream>
  11 #include <boost/serialization/string.hpp> // Needed to send/receive strings!
  12 namespace mpi = boost::mpi;
  13
  14 int main(int argc, char* argv[])
  15 {
  16   mpi::environment env(argc, argv);
  17   mpi::communicator world;
  18
  19   if (world.rank() == 0) {
  20     world.send(1, 0, std::string("Hello"));
  21     std::string msg;
  22     world.recv(1, 1, msg);
  23     std::cout << msg << "!" << std::endl;
  24   } else {
  25     std::string msg;
  26     world.recv(0, 0, msg);
  27     std::cout << msg << ", ";
  28     std::cout.flush();
  29     world.send(0, 1, std::string("world"));
  30   }
  31
  32   return 0;
  33 }