use mutex to lock scheduler

weboob/core/scheduler.py

@@ -17,7 +17,7 @@
 
 
 import logging
-from threading import Timer, Event
+from threading import Timer, Event, RLock
 
 
 __all__ = ['Scheduler']
@@ -38,6 +38,7 @@ class IScheduler(object):
 
 class Scheduler(IScheduler):
     def __init__(self):
+        self.mutex = RLock()
         self.stop_event = Event()
         self.count = 0
         self.queue = {}
@@ -46,6 +47,7 @@ class Scheduler(IScheduler):
         if self.stop_event.isSet():
             return
 
+        with self.mutex:
             self.count += 1
             logging.debug('function "%s" will be called in %s seconds' % (function.__name__, interval))
             timer = Timer(interval, self._callback, (self.count, function, args))
@@ -54,6 +56,7 @@ class Scheduler(IScheduler):
             return self.count
 
     def _callback(self, count, function, args):
+        with self.mutex:
             self.queue.pop(count)
         return function(*args)
 
@@ -65,6 +68,7 @@ class Scheduler(IScheduler):
 
     def _wait_to_stop(self):
         self.want_stop()
+        with self.mutex:
             for e in self.queue.itervalues():
                 e.cancel()
                 e.join()