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diff --git a/gc-7.2/include/private/pthread_stop_world.h b/gc-7.2/include/private/pthread_stop_world.h
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+++ b/gc-7.2/include/private/pthread_stop_world.h
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+/*
+ * 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_PTHREAD_STOP_WORLD_H
+#define GC_PTHREAD_STOP_WORLD_H
+
+struct thread_stop_info {
+#   ifndef GC_OPENBSD_THREADS
+      word last_stop_count;     /* GC_last_stop_count value when thread */
+                                /* last successfully handled a suspend  */
+                                /* signal.                              */
+#   endif
+
+    ptr_t stack_ptr;            /* Valid only when stopped.             */
+
+#   ifdef NACL
+      /* Grab NACL_GC_REG_STORAGE_SIZE pointers off the stack when      */
+      /* going into a syscall.  20 is more than we need, but it's an    */
+      /* overestimate in case the instrumented function uses any callee */
+      /* saved registers, they may be pushed to the stack much earlier. */
+      /* Also, on amd64 'push' puts 8 bytes on the stack even though    */
+      /* our pointers are 4 bytes.                                      */
+#     define NACL_GC_REG_STORAGE_SIZE 20
+      ptr_t reg_storage[NACL_GC_REG_STORAGE_SIZE];
+#   endif
+};
+
+GC_INNER void GC_stop_init(void);
+
+#endif