sim: Move the draining interface into a separate base class

This patch moves the draining interface from SimObject to a separate
class that can be used by any object needing draining. However,
objects not visible to the Python code (i.e., objects not deriving
from SimObject) still depend on their parents informing them when to
drain. This patch also gets rid of the CountedDrainEvent (which isn't
really an event) and replaces it with a DrainManager.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/sim/system.hh b/src/sim/system.hh
index 645ef8af2..d1b79bbf4 100644
--- a/src/sim/system.hh
+++ b/src/sim/system.hh
@@ -382,7 +382,9 @@ class System : public MemObject
 
     void serialize(std::ostream &os);
     void unserialize(Checkpoint *cp, const std::string &section);
-    virtual void resume();
+
+    unsigned int drain(DrainManager *dm);
+    void drainResume();
 
   public:
     Counter totalNumInsts;