From b78e273791ca8da450b9075d6cd539344bbd6fb9 Mon Sep 17 00:00:00 2001
From: Nils Werner <nils.werner@gmail.com>
Date: Mon, 19 Oct 2015 11:15:50 +0200
Subject: [PATCH] Fix Mac OSX backend threading issues, issue #5251

---
 src/_macosx.m | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/_macosx.m b/src/_macosx.m
index c0bd68f9c881..8f1412a99b3b 100644
--- a/src/_macosx.m
+++ b/src/_macosx.m
@@ -6049,7 +6049,9 @@ - (int)index
         [window orderFront:nil];
     }
     [pool release];
+    Py_BEGIN_ALLOW_THREADS
     [NSApp run];
+    Py_END_ALLOW_THREADS
     Py_INCREF(Py_None);
     return Py_None;
 }