diff --git a/eventlet/hubs/hub.py b/eventlet/hubs/hub.py
index 74f2809..4e93000 100644
--- a/eventlet/hubs/hub.py
+++ b/eventlet/hubs/hub.py
@@ -241,10 +241,11 @@ class BaseHub(object):
         # the 0 placeholder makes it easy to bisect_right using (now, 1)
         self.next_timers.append((when, 0, info))
 
-    def add_timer(self, timer):
+    def add_timer(self, timer, track=True):
         scheduled_time = self.clock() + timer.seconds
         self._add_absolute_timer(scheduled_time, timer)
-        self.track_timer(timer)
+        if track:
+            self.track_timer(timer)
         return scheduled_time
         
     def track_timer(self, timer):
@@ -259,7 +260,7 @@ class BaseHub(object):
             del self.timers_by_greenlet[timer.greenlet][timer]
             if not self.timers_by_greenlet[timer.greenlet]:
                 del self.timers_by_greenlet[timer.greenlet]
-        except KeyError:
+        except (KeyError, AttributeError):
             pass
 
     def timer_canceled(self, timer):
@@ -272,16 +273,30 @@ class BaseHub(object):
             ins(t, item)
         del self.next_timers[:]
 
-    def schedule_call(self, seconds, cb, *args, **kw):
+    def schedule_call_local(self, seconds, cb, *args, **kw):
         """Schedule a callable to be called after 'seconds' seconds have
-        elapsed.
+        elapsed. Cancel the timer if greenlet has exited.
             seconds: The number of seconds to wait.
             cb: The callable to call after the given time.
             *args: Arguments to pass to the callable when called.
             **kw: Keyword arguments to pass to the callable when called.
         """
         t = Timer(seconds, cb, *args, **kw)
-        self.add_timer(t)
+        self.add_timer(t, track=True)
+        return t
+
+    schedule_call = schedule_call_local
+
+    def schedule_call_global(self, seconds, cb, *args, **kw):
+        """Schedule a callable to be called after 'seconds' seconds have
+        elapsed. The timer will NOT 
+            seconds: The number of seconds to wait.
+            cb: The callable to call after the given time.
+            *args: Arguments to pass to the callable when called.
+            **kw: Keyword arguments to pass to the callable when called.
+        """
+        t = Timer(seconds, cb, *args, **kw)
+        self.add_timer(t, track=False)
         return t
 
     def fire_timers(self, when):
diff --git a/eventlet/hubs/libev.py b/eventlet/hubs/libev.py
index 637c670..3baf741 100644
--- a/eventlet/hubs/libev.py
+++ b/eventlet/hubs/libev.py
@@ -113,12 +113,13 @@ class Hub(hub.BaseHub):
             self.interrupted = False
             raise KeyboardInterrupt() 
 
-    def add_timer(self, timer):
+    def add_timer(self, timer, track=True):
         # store the pyevent timer object so that we can cancel later
         eventtimer = libev.Timer(timer.seconds, 0, self._evloop, timer)
         timer.impltimer = eventtimer
         eventtimer.start()
-        self.track_timer(timer)
+        if track:
+            self.track_timer(timer)
 
     def timer_finished(self, timer):
         try:
diff --git a/eventlet/hubs/libevent.py b/eventlet/hubs/libevent.py
index cc8cd1d..1cf5b23 100644
--- a/eventlet/hubs/libevent.py
+++ b/eventlet/hubs/libevent.py
@@ -118,12 +118,13 @@ class Hub(hub.BaseHub):
             self.interrupted = False
             raise KeyboardInterrupt() 
 
-    def add_timer(self, timer):
+    def add_timer(self, timer, track=True):
         # store the pyevent timer object so that we can cancel later
         eventtimer = event.timeout(timer.seconds, timer)
         timer.impltimer = eventtimer
         eventtimer.add()
-        self.track_timer(timer)
+        if track:
+            self.track_timer(timer)
 
     def timer_finished(self, timer):
         try:
diff --git a/eventlet/hubs/twistedr.py b/eventlet/hubs/twistedr.py
index 98a80aa..29073d2 100644
--- a/eventlet/hubs/twistedr.py
+++ b/eventlet/hubs/twistedr.py
@@ -111,7 +111,7 @@ class BaseTwistedHub(object):
     def exc_descriptor(self, _fileno):
         pass # XXX do something sensible here
 
-    def schedule_call(self, seconds, func, *args, **kwargs):
+    def schedule_call_local(self, seconds, func, *args, **kwargs):
         from twisted.internet import reactor
         def call_with_timer_attached(*args1, **kwargs1):
             try:
@@ -124,6 +124,12 @@ class BaseTwistedHub(object):
             self.track_timer(timer)
         return timer
 
+    schedule_call = schedule_call_local
+
+    def schedule_call_global(self, seconds, func, *args, **kwargs):
+        from twisted.internet import reactor
+        return callLater(reactor, seconds, func, *args, **kwargs)
+
     def track_timer(self, timer):
         try:
             current_greenlet = greenlet.getcurrent()