signal clean-up

myhdl/_Signal.py

@@ -34,7 +34,7 @@ from inspect import currentframe, getouterframes
 from copy import deepcopy as copy
 
 from myhdl import _simulator as sim
-from myhdl._simulator import _siglist, _futureEvents, now
+from myhdl._simulator import _signals, _siglist, _futureEvents, now
 from myhdl._intbv import intbv
 from myhdl._bin import bin
 
@@ -140,6 +140,12 @@ class Signal(object):
         self._negedgeWaiters = _NegedgeWaiterList(self)
         self._code = ""
         self._tracing = 0
+        _signals.append(self)
+
+    def _clear(self):
+        del self._eventWaiters[:]
+        del self._posedgeWaiters[:]
+        del self._negedgeWaiters[:]
         
     def _update(self):
         val, next = self._val, self._next

myhdl/_Simulation.py

@@ -31,7 +31,7 @@ from sets import Set
 
 from myhdl import Cosimulation, StopSimulation, _SuspendSimulation
 from myhdl import _simulator, SimulationError
-from myhdl._simulator import _siglist, _futureEvents
+from myhdl._simulator import _signals, _siglist, _futureEvents
 from myhdl._Waiter import _Waiter, _inferWaiter, _SignalWaiter,_SignalTupleWaiter
 from myhdl._util import _flatten, _printExcInfo
 from myhdl._always_comb import _AlwaysComb
@@ -82,6 +82,9 @@ class Simulation(object):
         if _simulator._tracing:
             _simulator._tracing = 0
             _simulator._tf.close()
+        # clean up for potential new run with same signals
+        for s in _signals:
+            s._clear()
         self._finished = True
             
         

myhdl/_simulator.py

@@ -28,6 +28,7 @@ __author__ = "Jan Decaluwe <jan@jandecaluwe.com>"
 __revision__ = "$Revision$"
 __date__ = "$Date$"
 
+_signals = []
 _siglist = []
 _futureEvents = []
 _time = 0