From 0bb03f83d796dff9cdf185cb991d8387a3592ac6 Mon Sep 17 00:00:00 2001
From: Joel Bender <joel@betelgeuse>
Date: Thu, 27 Apr 2017 21:26:24 -0400
Subject: [PATCH] non-blocking cleanup of the queue for abort

---
 py27/bacpypes/iocb.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/py27/bacpypes/iocb.py b/py27/bacpypes/iocb.py
index 5b9119c..fc94e3f 100644
--- a/py27/bacpypes/iocb.py
+++ b/py27/bacpypes/iocb.py
@@ -474,6 +474,7 @@ class IOQueue:
 
         # if the queue is empty and we do not block return None
         if not block and not self.notempty.isSet():
+            if _debug: IOQueue._debug("    - not blocking and empty")
             return None
 
         # wait for something to be in the queue
@@ -673,7 +674,7 @@ class IOQController(IOController):
             return
 
         while True:
-            iocb = self.ioQueue.get()
+            iocb = self.ioQueue.get(block=0)
             if not iocb:
                 break
             if _debug: IOQController._debug("    - iocb: %r", iocb)