From 6ad534ad7fd9659ae5b7a252904f6118922d69b9 Mon Sep 17 00:00:00 2001
From: Greg Lucas <greg.m.lucas@gmail.com>
Date: Wed, 7 Feb 2024 20:33:08 -0700
Subject: [PATCH] Backport PR #27755: Allow threads during macos event loop

---
 src/_macosx.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/_macosx.m b/src/_macosx.m
index 47df6c37da93..3fac8b41f84e 100755
--- a/src/_macosx.m
+++ b/src/_macosx.m
@@ -461,6 +461,8 @@ int mpl_check_modifier(
         return NULL;
     }
 
+    Py_BEGIN_ALLOW_THREADS
+
     NSDate* date =
         (timeout > 0.0) ? [NSDate dateWithTimeIntervalSinceNow: timeout]
                         : [NSDate distantFuture];
@@ -473,6 +475,8 @@ int mpl_check_modifier(
        [NSApp sendEvent: event];
     }
 
+    Py_END_ALLOW_THREADS
+
     Py_RETURN_NONE;
 }