diff -r db661cee5baa Lib/concurrent/futures/__init__.py
--- a/Lib/concurrent/futures/__init__.py	Sat Jan 14 11:53:37 2012 +0100
+++ b/Lib/concurrent/futures/__init__.py	Sat Jan 14 17:51:55 2012 +0100
@@ -13,6 +13,12 @@
 Future,
 Executor,
 wait,
- as_completed)
+ as_completed,
+ FUTURE_STATES,
+ PENDING,
+ RUNNING,
+ CANCELLED,
+ CANCELLED_AND_NOTIFIED,
+ FINISHED)
 from concurrent.futures.process import ProcessPoolExecutor
 from concurrent.futures.thread import ThreadPoolExecutor
diff -r db661cee5baa Lib/concurrent/futures/_base.py
--- a/Lib/concurrent/futures/_base.py	Sat Jan 14 11:53:37 2012 +0100
+++ b/Lib/concurrent/futures/_base.py	Sat Jan 14 17:51:55 2012 +0100
@@ -22,7 +22,7 @@
 CANCELLED_AND_NOTIFIED = 'CANCELLED_AND_NOTIFIED'
 FINISHED = 'FINISHED'
 
-_FUTURE_STATES = [
+FUTURE_STATES = [
 PENDING,
 RUNNING,
 CANCELLED,
@@ -274,12 +274,17 @@
 done.update(waiter.finished_futures)
 return DoneAndNotDoneFutures(done, set(fs) - done)
 
+Event = collections.namedtuple("Event", ["state", "timestamp"])
+Event.__doc__ = """Stores the timestamp at which a Future changed its state."""
+
 class Future(object):
 """Represents the result of an asynchronous computation."""
 
 def __init__(self):
 """Initializes the future. Should not be called by clients."""
 self._condition = threading.Condition()
+ self.__state = None
+ self.__history = []
 self._state = PENDING
 self._result = None
 self._exception = None
@@ -498,6 +503,27 @@
 self._condition.notify_all()
 self._invoke_callbacks()
 
+ @property
+ def state(self):
+ """The current state of the future. It is one of FUTURE_STATES"""
+ return self.__state
+
+ @property
+ def _state(self):
+ """Internal state property used also to store the state history
+ of the future"""
+ return self.__state
+
+ @_state.setter
+ def _state(self, value):
+ self.__state = value
+ self.__history.append(Event(value, time.time()))
+
+ @property
+ def history(self):
+ """The state history of the future. Return a list of Event objects"""
+ return self.__history
+
 class Executor(object):
 """This is an abstract base class for concrete asynchronous executors."""
 
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