--- /dev/null
+/* Copyright (c) 2007-2016. 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. */
+
+/** @addtogroup MSG_examples
+ *
+ * - <b>maestro-set/maestro-set.cpp: Switch the system thread hosting our maestro</b>.
+ * That's a very advanced example in which we move the maestro thread to another process.
+ * Not many users need it (maybe only one, actually), but this example is also a regression test.
+ *
+ * This example is in C++ because we use C++11 threads to ensure that the feature is working as
+ * expected. You can still use that feature from a C code.
+ */
+
+#include "simgrid/msg.h"
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
+
+#include <thread>
+
+std::thread::id root_id;
+
+static void ensure_root_tid() {
+ std::thread::id this_id = std::this_thread::get_id();
+ xbt_assert(root_id == this_id, "I was supposed to be the main thread");
+ XBT_INFO("I am the main thread, as expected");
+}
+static void ensure_other_tid() {
+ std::thread::id this_id = std::this_thread::get_id();
+ xbt_assert(this_id != root_id, "I was NOT supposed to be the main thread");
+ XBT_INFO("I am not the main thread, as expected");
+}
+
+
+
+static int sender(int argc, char *argv[])
+{
+ ensure_root_tid();
+
+ msg_task_t task_la = MSG_task_create("Some task", 0.0, 10e8, NULL);
+ MSG_task_send(task_la, "some mailbox");
+
+ return 0;
+}
+
+static int receiver(int argc, char *argv[])
+{
+ ensure_other_tid();
+
+ msg_task_t task_la = NULL;
+ xbt_assert(MSG_task_receive(&task_la,"some mailbox") == MSG_OK);
+ XBT_INFO("Task received");
+ MSG_task_destroy(task_la);
+
+ return 0;
+}
+
+static void maestro(void* data)
+{
+ ensure_other_tid();
+ MSG_process_create("receiver",&receiver,NULL,MSG_host_by_name("Jupiter"));
+ MSG_main();
+}
+
+/** Main function */
+int main(int argc, char *argv[])
+{
+ root_id = std::this_thread::get_id();
+
+ SIMIX_set_maestro(maestro, NULL);
+ MSG_init(&argc, argv);
+
+ if (argc != 2) {
+ XBT_CRITICAL("Usage: %s platform_file\n", argv[0]);
+ xbt_die("example: %s msg_platform.xml\n",argv[0]);
+ }
+
+ MSG_create_environment(argv[1]);
+
+ /* Become one of the simulated process.
+ *
+ * This must be done after the creation of the platform because we are depending attaching to a host.*/
+ MSG_process_attach("sender", NULL, MSG_host_by_name("Tremblay"), NULL);
+ ensure_root_tid();
+
+ // Execute the sender code:
+ const char* subargv[3] = { "sender", "Jupiter", NULL };
+ sender(2, (char**) subargv);
+
+ MSG_process_detach(); // Become root thread again
+ XBT_INFO("Detached");
+ ensure_root_tid();
+
+ return 0;
+}
