examples/cpp/mc-bugged2/s4u-mc-bugged2.cpp

   1 /* Copyright (c) 2010-2022. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 /******************** Non-deterministic message ordering  *********************/
   7 /* Server assumes a fixed order in the reception of messages from its clients */
   8 /* which is incorrect because the message ordering is non-deterministic       */
   9 /******************************************************************************/
  10
  11 #include <simgrid/modelchecker.h>
  12 #include <simgrid/s4u.hpp>
  13
  14 XBT_LOG_NEW_DEFAULT_CATEGORY(example, "this example");
  15
  16 static void server()
  17 {
  18   const int* received1 = nullptr;
  19   const int* received2 = nullptr;
  20
  21   received1 = simgrid::s4u::Mailbox::by_name("mymailbox")->get<int>();
  22   long val1 = *received1;
  23   delete received1;
  24
  25   received2 = simgrid::s4u::Mailbox::by_name("mymailbox")->get<int>();
  26   long val2 = *received2;
  27   delete received2;
  28
  29   XBT_INFO("First pair received: %ld %ld", val1, val2);
  30
  31   MC_assert(std::min(val1, val2) == 1); // if the two messages of the second client arrive first, this is violated.
  32
  33   received1 = simgrid::s4u::Mailbox::by_name("mymailbox")->get<int>();
  34   val1      = *received1;
  35   delete received1;
  36
  37   received2 = simgrid::s4u::Mailbox::by_name("mymailbox")->get<int>();
  38   val2      = *received2;
  39   delete received2;
  40
  41   XBT_INFO("Second pair received: %ld %ld", val1, val2);
  42 }
  43
  44 static void client(int id)
  45 {
  46   auto* payload1 = new int(id);
  47   auto* payload2 = new int(id);
  48
  49   simgrid::s4u::Mailbox::by_name("mymailbox")->put(payload1, 10000);
  50   simgrid::s4u::Mailbox::by_name("mymailbox")->put(payload2, 10000);
  51 }
  52
  53 int main(int argc, char* argv[])
  54 {
  55   simgrid::s4u::Engine e(&argc, argv);
  56
  57   e.load_platform(argv[1]);
  58
  59   simgrid::s4u::Actor::create("server", e.host_by_name("HostA"), server);
  60   simgrid::s4u::Actor::create("client", e.host_by_name("HostB"), client, 1);
  61   simgrid::s4u::Actor::create("client", e.host_by_name("HostC"), client, 2);
  62
  63   e.run();
  64   return 0;
  65 }