--- /dev/null
+/* Copyright (c) 2015. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+/* In this test, we have two senders sending one message to a common receiver.
+ * The receiver should be able to see any ordering between the two messages.
+ * If we model-check the application with assertions on a specific order of
+ * the messages (see the assertions in the receiver code), it should fail
+ * because both ordering are possible.
+ *
+ * If the senders sends the message directly, the current version of the MC
+ * finds that the ordering may differ and the MC find a counter-example.
+ *
+ * However, if the senders send the message in a mutex, the MC always let
+ * the first process take the mutex because it thinks that the effect of
+ * a mutex is purely local: the ordering of the messages is always the same
+ * and the MC does not find the counter-example.
+ */
+
+#include "simgrid/msg.h"
+#include "mc/mc.h"
+#include <xbt/synchro_core.h>
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
+
+#define BOX_NAME "box"
+
+#ifndef DISABLE_THE_MUTEX
+static xbt_mutex_t mutex = NULL;
+#endif
+
+static int receiver(int argc, char *argv[])
+{
+ msg_task_t task = NULL;
+
+ MSG_task_receive(&task, BOX_NAME);
+ MC_assert(strcmp(MSG_task_get_name(task), "X") == 0);
+ MSG_task_destroy(task);
+
+ MSG_task_receive(&task, BOX_NAME);
+ MC_assert(strcmp(MSG_task_get_name(task), "Y") == 0);
+ MSG_task_destroy(task);
+
+ return 0;
+}
+
+static int sender(int argc, char *argv[])
+{
+ char* message_name = argv[1];
+#ifndef DISABLE_THE_MUTEX
+ xbt_mutex_acquire(mutex);
+#endif
+ MSG_task_send(MSG_task_create(message_name, 0.0, 0.0, NULL), BOX_NAME);
+#ifndef DISABLE_THE_MUTEX
+ xbt_mutex_release(mutex);
+#endif
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ MSG_init(&argc, argv);
+ xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n"
+ "\tExample: %s msg_platform.xml msg_deployment.xml\n", argv[0], argv[0]);
+
+ MSG_create_environment(argv[1]);
+ MSG_function_register("receiver", receiver);
+ MSG_function_register("sender", sender);
+
+ MSG_launch_application(argv[2]);
+#ifndef DISABLE_THE_MUTEX
+ mutex = xbt_mutex_init();
+#endif
+ msg_error_t res = MSG_main();
+#ifndef DISABLE_THE_MUTEX
+ xbt_mutex_destroy(mutex); mutex = NULL;
+#endif
+ XBT_INFO("Simulation time %g", MSG_get_clock());
+
+ return res != MSG_OK;
+}
