+/** Returns true if run from the kernel mode, and false if run from a real actor
+ *
+ * Everything that is run out of any actor (simulation setup before the engine is run,
+ * computing the model evolutions as a result to the actors' action, etc) is run in
+ * kernel mode, just as in any operating systems.
+ *
+ * In SimGrid, the actor in charge of doing the stuff in kernel mode is called Maestro,
+ * because it is the one scheduling when the others should move or wait.
+ */
+bool isMaestro()
+{
+ smx_actor_t process = SIMIX_process_self();
+ return process == nullptr || process == simix_global->maestro_process;
+}
+
+void sleep_for(double duration)
+{
+ if (duration > 0)
+ simcall_process_sleep(duration);
+}
+
+XBT_PUBLIC(void) sleep_until(double timeout)
+{
+ double now = SIMIX_get_clock();
+ if (timeout > now)
+ simcall_process_sleep(timeout - now);
+}
+
+void execute(double flops)
+{
+ smx_activity_t s = simcall_execution_start(nullptr,flops,1.0/*priority*/,0./*bound*/);
+ simcall_execution_wait(s);
+}
+
+void* recv(MailboxPtr chan) // deprecated
+{
+ return chan->get();
+}
+
+void* recv(MailboxPtr chan, double timeout) // deprecated
+{
+ return chan->get(timeout);