The tc needs to be protected instead of private so that the CpuEventWrapper can access it.

--HG--
extra : convert_revision : bd836d63ac3630b20dda552e7b289730f3c114ef
diff --git a/src/cpu/cpuevent.hh b/src/cpu/cpuevent.hh
index 9dfae27..3339f82 100644
--- a/src/cpu/cpuevent.hh
+++ b/src/cpu/cpuevent.hh
@@ -44,7 +44,7 @@
  * */
 class CpuEvent : public Event
 {
-  private:
+  protected:
     /** type of global list of cpu events. */
     typedef std::vector<CpuEvent *> CpuEventList;