Use timeout constants instead of magic numbers in scheduler and event loop

Set default wait timeout as max() of previous values

sleekxmpp/xmlstream/scheduler.py

@@ -20,6 +20,11 @@ import itertools
 from sleekxmpp.util import Queue, QueueEmpty
 
 
+#: The time in seconds to wait for events from the event queue, and also the
+#: time between checks for the process stop signal.
+WAIT_TIMEOUT = 1.0
+
+
 log = logging.getLogger(__name__)
 
 
@@ -120,6 +125,10 @@ class Scheduler(object):
         #: Lock for accessing the task queue.
         self.schedule_lock = threading.RLock()
 
+        #: The time in seconds to wait for events from the event queue,
+        #: and also the time between checks for the process stop signal.
+        self.wait_timeout = WAIT_TIMEOUT
+
     def process(self, threaded=True, daemon=False):
         """Begin accepting and processing scheduled tasks.
 
@@ -143,7 +152,7 @@ class Scheduler(object):
                 if self.schedule:
                     wait = self.schedule[0].next - time.time()
                 else:
-                    wait = 0.1
+                    wait = self.wait_timeout
                 try:
                     if wait <= 0.0:
                         newtask = self.addq.get(False)
@@ -156,8 +165,8 @@ class Scheduler(object):
                               not self.stop.is_set() and \
                               newtask is None and \
                               elapsed < wait:
-                            newtask = self.addq.get(True, 0.1)
-                            elapsed += 0.1
+                            newtask = self.addq.get(True, self.wait_timeout)
+                            elapsed += self.wait_timeout
                 except QueueEmpty:                      # Time to run some tasks, and no new tasks to add.
                     self.schedule_lock.acquire()
                     # select only those tasks which are to be executed now