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diff --git a/kern/act.h b/kern/act.h
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+/*
+ * Copyright (c) 1993,1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).  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.
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+/*
+ *	File:	act.h
+ *
+ *	This defines the Act structure,
+ *	which is the kernel representation of a user-space activation.
+ *
+ */
+
+#ifndef	_KERN_ACT_H_
+#define _KERN_ACT_H_
+
+#ifdef MIGRATING_THREADS
+
+#ifndef __dead /* XXX */
+#define __dead
+#endif
+
+#include <mach_ipc_compat.h>
+#include <mach/vm_param.h>
+#include <mach/port.h>
+#include <kern/lock.h>
+#include <kern/refcount.h>
+#include <kern/queue.h>
+
+#include "act.h"/*XXX*/
+
+struct task;
+struct thread;
+struct Act;
+
+
+struct ReturnHandler {
+	struct ReturnHandler *next;
+	void (*handler)(struct ReturnHandler *rh, struct Act *act);
+};
+typedef struct ReturnHandler ReturnHandler;
+
+
+
+struct Act {
+
+	/*** Task linkage ***/
+
+	/* Links for task's circular list of activations.
+	   The activation is only on the task's activation list while active.
+	   Must be first.  */
+	queue_chain_t	task_links;
+
+	/* Reference to the task this activation is in.
+	   This is constant as long as the activation is allocated.  */
+	struct task	*task;
+
+
+
+	/*** Machine-dependent state ***/
+	/* XXX should be first to allow maximum flexibility to MD code */
+	MachineAct	mact;
+
+
+
+	/*** Consistency ***/
+	RefCount	ref_count;
+	decl_simple_lock_data(,lock)
+
+
+
+	/*** ipc_target-related stuff ***/
+
+	/* ActPool this activation normally lives on, zero if none.
+	   The activation and actpool hold references to each other as long as this is nonzero
+	   (even when the activation isn't actually on the actpool's list).  */
+	struct ipc_target	*ipt;
+
+	/* Link on the ipt's list of activations.
+	   The activation is only actually on the ipt's list (and hence this is valid)
+	   when we're not in use (thread == 0) and not suspended (suspend_count == 0).  */
+	struct Act	*ipt_next;
+
+
+
+	/*** Thread linkage ***/
+
+	/* Thread this activation is in, zero if not in use.
+	   The thread holds a reference on the activation while this is nonzero. */
+	struct thread	*thread;
+
+	/* The rest in this section is only valid when thread is nonzero.  */
+
+	/* Next higher and next lower activation on the thread's activation stack.
+	   For a topmost activation or the null_act, higher is undefined.
+	   The bottommost activation is always the null_act.  */
+	struct Act	*higher, *lower;
+
+	/* Alert bits pending at this activation;
+	   some of them may have propagated from lower activations.  */
+	unsigned	alerts;
+
+	/* Mask of alert bits to be allowed to pass through from lower levels.  */
+	unsigned	alert_mask;
+
+
+
+	/*** Control information ***/
+
+	/* Number of outstanding suspensions on this activation.  */
+	int		suspend_count;
+
+	/* This is normally true, but is set to false when the activation is terminated.  */
+	int		active;
+
+	/* Chain of return handlers to be called
+	   before the thread is allowed to return to this invocation */
+	ReturnHandler	*handlers;
+
+	/* A special ReturnHandler attached to the above chain to handle suspension and such */
+	ReturnHandler	special_handler;
+
+
+
+	/* Special ports attached to this activation */
+	struct ipc_port *self;			/* not a right, doesn't hold ref */
+	struct ipc_port *self_port;		/* a send right */
+	struct ipc_port *exception_port;	/* a send right */
+	struct ipc_port *syscall_port;		/* a send right */
+#if	MACH_IPC_COMPAT
+	struct ipc_port *reply_port;		/* a send right */
+	struct task	*reply_task;
+#endif	MACH_IPC_COMPAT
+};
+typedef struct Act Act;
+typedef struct Act *act_t;
+typedef mach_port_t *act_array_t;
+
+#define ACT_NULL ((Act*)0)
+
+
+/* Exported to world */
+kern_return_t	act_create(struct task *task, vm_offset_t user_stack, vm_offset_t user_rbuf, vm_size_t user_rbuf_size, struct Act **new_act);
+kern_return_t	act_alert_mask(struct Act *act, unsigned alert_mask);
+kern_return_t	act_alert(struct Act *act, unsigned alerts);
+kern_return_t	act_abort(struct Act *act);
+kern_return_t	act_abort_safely(struct Act *act);
+kern_return_t	act_terminate(struct Act *act);
+kern_return_t	act_suspend(struct Act *act);
+kern_return_t	act_resume(struct Act *act);
+kern_return_t	act_get_state(struct Act *act, int flavor,
+			natural_t *state, natural_t *pcount);
+kern_return_t	act_set_state(struct Act *act, int flavor,
+			natural_t *state, natural_t count);
+
+#define		act_lock(act)		simple_lock(&(act)->lock)
+#define		act_unlock(act)		simple_unlock(&(act)->lock)
+
+#define		act_reference(act)	refcount_take(&(act)->ref_count)
+void		act_deallocate(struct Act *act);
+
+/* Exported to startup.c */
+void		act_init(void);
+
+/* Exported to task.c */
+kern_return_t	act_terminate_task_locked(struct Act *act);
+
+/* Exported to thread.c */
+extern Act	null_act;
+kern_return_t	act_create_kernel(Act **out_act);
+
+/* Exported to machine-dependent activation code */
+void		act_execute_returnhandlers(void);
+
+
+
+/* System-dependent functions */
+kern_return_t	act_machine_create(struct task *task, Act *inc, vm_offset_t user_stack, vm_offset_t user_rbuf, vm_size_t user_rbuf_size);
+void		act_machine_destroy(Act *inc);
+kern_return_t	act_machine_set_state(Act *inc, int flavor, int *tstate, unsigned count);
+kern_return_t	act_machine_get_state(Act *inc, int flavor, int *tstate, unsigned *count);
+
+
+
+#endif /* MIGRATING_THREADS */
+#endif _KERN_ACT_H_