Merge pull request #190 from Takishipp/clean_events

[simgrid.git] / src / s4u / s4u_actor.cpp

diff --git a/src/s4u/s4u_actor.cpp b/src/s4u/s4u_actor.cpp
index 37d935f..ab6f3a1 100644 (file)
--- a/src/s4u/s4u_actor.cpp
+++ b/src/s4u/s4u_actor.cpp
@@ -11,6 +11,9 @@
 #include "simgrid/s4u/Mailbox.hpp"
 
 #include "src/kernel/context/Context.hpp"
+#include "src/simix/smx_private.h"
+
+#include <sstream>
 
 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_actor, "S4U actors");
 
@@ -167,6 +170,21 @@ void Actor::setProperty(const char* key, const char* value)
 
 namespace this_actor {
 
+/** 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)