From 6c65d5523e61fd896df176736e184f45d64a44a7 Mon Sep 17 00:00:00 2001
From: James Lu <james@overdrivenetworks.com>
Date: Sun, 17 Dec 2017 00:36:44 -0800
Subject: [PATCH] IRCNetwork: potentially fix queue thread shutdowns (#558)

Replace unreliable appendleft() usage with replacing the first element (or adding None if the queue is empty).
---
 classes.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/classes.py b/classes.py
index 77bb216..b7fcc9d 100644
--- a/classes.py
+++ b/classes.py
@@ -1450,9 +1450,13 @@ class IRCNetwork(PyLinkNetworkCoreWithUtils):
             self._socket.close()
 
         # Stop the queue thread.
-        if self._queue:
-            # XXX: queue.Queue.queue isn't actually documented, so this is probably not reliable in the long run.
-            self._queue.queue.appendleft(None)
+        if self._queue is not None:
+            try:
+                # XXX: queue.Queue.queue isn't actually documented, so this is probably not reliable in the long run.
+                with self._queue.mutex:
+                    self._queue.queue[0] = None
+            except IndexError:
+                self._queue.put(None)
 
         # Stop the ping timer.
         if self._ping_timer: