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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 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.
+ */
+/*
+ */
+/*
+ *	File:	ipc/ipc_thread.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Definitions for the IPC component of threads.
+ */
+
+#ifndef	_IPC_IPC_THREAD_H_
+#define _IPC_IPC_THREAD_H_
+
+#include <kern/thread.h>
+
+typedef thread_t ipc_thread_t;
+
+#define	ITH_NULL		THREAD_NULL
+
+#define	ith_lock_init(thread)	simple_lock_init(&(thread)->ith_lock_data)
+#define	ith_lock(thread)	simple_lock(&(thread)->ith_lock_data)
+#define	ith_unlock(thread)	simple_unlock(&(thread)->ith_lock_data)
+
+typedef struct ipc_thread_queue {
+	ipc_thread_t ithq_base;
+} *ipc_thread_queue_t;
+
+#define	ITHQ_NULL		((ipc_thread_queue_t) 0)
+
+
+#define	ipc_thread_links_init(thread)		\
+MACRO_BEGIN					\
+	(thread)->ith_next = (thread);		\
+	(thread)->ith_prev = (thread);		\
+MACRO_END
+
+#define	ipc_thread_queue_init(queue)		\
+MACRO_BEGIN					\
+	(queue)->ithq_base = ITH_NULL;		\
+MACRO_END
+
+#define	ipc_thread_queue_empty(queue)	((queue)->ithq_base == ITH_NULL)
+
+#define	ipc_thread_queue_first(queue)	((queue)->ithq_base)
+
+#define	ipc_thread_rmqueue_first_macro(queue, thread)			\
+MACRO_BEGIN								\
+	register ipc_thread_t _next;					\
+									\
+	assert((queue)->ithq_base == (thread));				\
+									\
+	_next = (thread)->ith_next;					\
+	if (_next == (thread)) {					\
+		assert((thread)->ith_prev == (thread));			\
+		(queue)->ithq_base = ITH_NULL;				\
+	} else {							\
+		register ipc_thread_t _prev = (thread)->ith_prev;	\
+									\
+		(queue)->ithq_base = _next;				\
+		_next->ith_prev = _prev;				\
+		_prev->ith_next = _next;				\
+		ipc_thread_links_init(thread);				\
+	}								\
+MACRO_END
+
+#define	ipc_thread_enqueue_macro(queue, thread)				\
+MACRO_BEGIN								\
+	register ipc_thread_t _first = (queue)->ithq_base;		\
+									\
+	if (_first == ITH_NULL) {					\
+		(queue)->ithq_base = (thread);				\
+		assert((thread)->ith_next == (thread));			\
+		assert((thread)->ith_prev == (thread));			\
+	} else {							\
+		register ipc_thread_t _last = _first->ith_prev;		\
+									\
+		(thread)->ith_next = _first;				\
+		(thread)->ith_prev = _last;				\
+		_first->ith_prev = (thread);				\
+		_last->ith_next = (thread);				\
+	}								\
+MACRO_END
+
+/* Enqueue a thread on a message queue */
+extern void ipc_thread_enqueue(
+	ipc_thread_queue_t	queue,
+	ipc_thread_t		thread);
+
+/* Dequeue a thread from a message queue */
+extern ipc_thread_t ipc_thread_dequeue(
+	ipc_thread_queue_t	queue);
+
+/* Remove a thread from a message queue */
+extern void ipc_thread_rmqueue(
+	ipc_thread_queue_t	queue,
+	ipc_thread_t		thread);
+
+#endif	/* _IPC_IPC_THREAD_H_ */