ferroui-native 0.3.0

The macOS platform of FerroUI: windows, input, clipboard, drag and drop, menus and Metal and OpenGL graphics over a native library
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diff --git a/native/FerroUI.Native/inc/comimpl.h b/native/FerroUI.Native/inc/comimpl.h
index a21b923..13733c9 100644
--- a/native/FerroUI.Native/inc/comimpl.h
+++ b/native/FerroUI.Native/inc/comimpl.h
@@ -4,6 +4,7 @@
 #ifndef COMIMPL_H_INCLUDED
 #define COMIMPL_H_INCLUDED
 
+#include <atomic>
 #include <cstring>
 #include <memory>
 #include <utility>
@@ -224,22 +225,22 @@ public:
 class ComObject : public virtual IUnknown
 {
 private:
-    unsigned int _refCount;
+    // Atomic: an object is referenced and released by the UI thread and by
+    // the render thread.
+    std::atomic<unsigned int> _refCount;
     std::shared_ptr<ComObjectWeakRefToken> _weakRefs;
 public:
     
     virtual ULONG AddRef()
     {
-        _refCount++;
-        return _refCount;
+        return ++_refCount;
     }
     
     
     virtual ULONG Release()
     {
-        _refCount--;
-        ULONG rv = _refCount;
-        if(_refCount == 0)
+        ULONG rv = --_refCount;
+        if(rv == 0)
             delete(this);
         return rv;
     }