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diff --git a/ddb/db_task_thread.h b/ddb/db_task_thread.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#ifndef _DDB_DB_TASK_THREAD_H_
+#define _DDB_DB_TASK_THREAD_H_
+
+#include <kern/task.h>
+#include <kern/thread.h>
+
+#define db_current_task()						\
+		((current_thread())? current_thread()->task: TASK_NULL)
+#define db_target_space(thread, user_space)				\
+		((!(user_space))? TASK_NULL:				\
+		(thread)? (thread)->task: db_current_task())
+#define db_is_current_task(task) 					\
+		((task) == TASK_NULL || (task) == db_current_task())
+
+extern task_t	db_default_task;		/* default target task */
+extern thread_t	db_default_thread;		/* default target thread */
+
+extern int		db_lookup_task(/* task_t */);
+extern int		db_lookup_thread(/* thread_t */);
+extern int		db_lookup_task_thread(/* task_t, thread_t */);
+extern boolean_t	db_check_thread_address_valid(/* db_expr_t */);
+extern boolean_t	db_get_next_thread(/* thread_t *, int */);
+extern void		db_init_default_thread();
+
+#endif  _DDB_DB_TASK_THREAD_H_