close poll object after loop stopped

shadowsocks/eventloop.py

@@ -98,6 +98,9 @@ class KqueueLoop(object):
         self.unregister(fd)
         self.register(fd, mode)
 
+    def close(self):
+        self._kqueue.close()
+
 
 class SelectLoop(object):
 
@@ -135,6 +138,9 @@ class SelectLoop(object):
         self.unregister(fd)
         self.register(fd, mode)
 
+    def close(self):
+        pass
+
 
 class EventLoop(object):
     def __init__(self):
@@ -216,6 +222,9 @@ class EventLoop(object):
                     callback()
                 self._last_time = now
 
+    def __del__(self):
+        self._impl.close()
+
 
 # from tornado
 def errno_from_exception(e):