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diff --git a/gc-7.2/include/private/darwin_stop_world.h b/gc-7.2/include/private/darwin_stop_world.h
new file mode 100644
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+++ b/gc-7.2/include/private/darwin_stop_world.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 1994 by Xerox Corporation.  All rights reserved.
+ * Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
+ * Copyright (c) 1998 by Fergus Henderson.  All rights reserved.
+ * Copyright (c) 2000-2009 by Hewlett-Packard Development Company.
+ * All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose,  provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+#ifndef GC_DARWIN_STOP_WORLD_H
+#define GC_DARWIN_STOP_WORLD_H
+
+#if !defined(GC_DARWIN_THREADS)
+# error darwin_stop_world.h included without GC_DARWIN_THREADS defined
+#endif
+
+#include <mach/mach.h>
+#include <mach/thread_act.h>
+
+struct thread_stop_info {
+  mach_port_t mach_thread;
+  ptr_t stack_ptr; /* Valid only when thread is in a "blocked" state.   */
+};
+
+#ifndef DARWIN_DONT_PARSE_STACK
+  GC_INNER ptr_t GC_FindTopOfStack(unsigned long);
+#endif
+
+#ifdef MPROTECT_VDB
+  GC_INNER void GC_mprotect_stop(void);
+  GC_INNER void GC_mprotect_resume(void);
+#endif
+
+#if defined(PARALLEL_MARK) && !defined(GC_NO_THREADS_DISCOVERY)
+  GC_INNER GC_bool GC_is_mach_marker(thread_act_t);
+#endif
+
+#endif