From ab943f031c3db32dd186d63cc5b9cae7c4ffc98e Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Mon, 29 Apr 2019 22:55:11 +0200
Subject: [PATCH] Protected Watchman autoreloader against busy loops.

With an error in the loop above (e.g. using query without args), this
would trigger a busy loop. While this was caused due to changes to the
loop itself, it seems to be just good practice to protect against this.
---
 django/utils/autoreload.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/django/utils/autoreload.py b/django/utils/autoreload.py
index 19326a5118..442ece1f6d 100644
--- a/django/utils/autoreload.py
+++ b/django/utils/autoreload.py
@@ -546,6 +546,8 @@ class WatchmanReloader(BaseReloader):
                 for sub in list(self.client.subs.keys()):
                     self._check_subscription(sub)
             yield
+            # Protect against busy loops.
+            time.sleep(0.1)
 
     def stop(self):
         self.client.close()