sim-ruby: checkpointing fixes and dependent eventq improvements

Fixes checkpointing with respect to lost events after swapping event queues.
Also adds DPRINTFs to better understand what's going on when Ruby serializes
and unserializes.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/mem/ruby/system/System.hh b/src/mem/ruby/system/System.hh
index 461abffe2..d7d01bcac 100644
--- a/src/mem/ruby/system/System.hh
+++ b/src/mem/ruby/system/System.hh
@@ -129,6 +129,13 @@ class RubySystem : public SimObject
     void registerAbstractController(AbstractController*);
     void registerSparseMemory(SparseMemory*);
 
+    bool eventQueueEmpty() { return eventq->empty(); }
+    void enqueueRubyEvent(Tick tick)
+    {
+        RubyEvent* e = new RubyEvent(this);
+        schedule(e, tick);
+    }
+
   private:
     // Private copy constructor and assignment operator
     RubySystem(const RubySystem& obj);