From b996d06522490f3329249f2d0efb284a46240a69 Mon Sep 17 00:00:00 2001
From: danwalmsley <dan@walms.co.uk>
Date: Wed, 26 Feb 2020 07:57:28 -0300
Subject: [PATCH] Merge pull request #3613 from
 AvaloniaUI/osx-potential-deadlock-in-user-code

OSX - fix potential deadlock with user code
---
 native/Avalonia.Native/src/OSX/platformthreading.mm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/native/Avalonia.Native/src/OSX/platformthreading.mm b/native/Avalonia.Native/src/OSX/platformthreading.mm
index e7abedae51..ed00f8c5e1 100644
--- a/native/Avalonia.Native/src/OSX/platformthreading.mm
+++ b/native/Avalonia.Native/src/OSX/platformthreading.mm
@@ -157,11 +157,14 @@ NSArray<NSString*>* _modes;
 
 -(void) perform
 {
+    ComPtr<IAvnSignaledCallback> cb;
     @synchronized (self) {
         _signaled  = false;
-        if(_parent != NULL && _parent->SignaledCallback != NULL)
-            _parent->SignaledCallback->Signaled(0, false);
+        if(_parent != NULL)
+            cb = _parent->SignaledCallback;
     }
+    if(cb != nullptr)
+        cb->Signaled(0, false);
 }
 
 -(void) setParent:(PlatformThreadingInterface *)parent