[svn r111] add ready() method to event class, so you can tell in advance whether or not wait() is going to block.

eventlet/coros.py

@@ -95,6 +95,14 @@ class event(object):
         self.epoch = time.time()
         self._result = NOT_USED
         self._waiters = {}
+        
+    def ready(self):
+        """ Return true if the wait() call will return immediately. 
+        Used to avoid waiting for things that might take a while to time out.
+        For example, you can put a bunch of events into a list, and then visit
+        them all repeatedly, calling ready() until one returns True, and then
+        you can wait() on that one."""
+        return self._result is not NOT_USED
 
     def wait(self):
         """Wait until another coroutine calls send.