Source to kern/zalloc.h

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @[email protected]
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @[email protected]
 */

/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 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  [email protected]
 *  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.
 */
/*
 * Copyright (c) 1995, 1997 Apple Computer, Inc.
 *
 * HISTORY
 *
 * 23 June 1995 ? at NeXT
 *	Pulled over from CMU (MK83), added local
 * 	mods: freespace suballocator and sorted
 *	zone free lists to reduce fragmentation.
 */
/*
 *	File:	zalloc.h
 *	Author:	Avadis Tevanian, Jr.
 *	Date:	 1985
 *
 */

#ifndef	_KERN_ZALLOC_H_
#define _KERN_ZALLOC_H_

#include <mach/machine/vm_types.h>
#include <kern/lock.h>
#include <kern/queue.h>
#include <machdep/machine/machspl.h>

/*
 *	A zone is a collection of fixed size blocks for which there
 *	is fast allocation/deallocation access.  Kernel routines can
 *	use zones to manage data structures dynamically, creating a zone
 *	for each type of data structure to be managed.
 *
 */

typedef struct zone {
	decl_simple_lock_data(,lock)	/* generic lock */
	spl_t		lock_ipl;
	int		count;		/* Number of elements used now */
	vm_offset_t	last_insert;
	vm_offset_t	free_elements;
	vm_size_t	cur_size;	/* current memory utilization */
	vm_size_t	max_size;	/* how large can this zone grow */
	vm_size_t	elem_size;	/* size of an element */
	vm_size_t	alloc_size;	/* size used for more memory */
	boolean_t	doing_alloc;	/* is zone expanding now? */
	char		*zone_name;	/* a name for the zone */
	unsigned int
	/* boolean_t */	pageable :1,	/* zone pageable? */
	/* boolean_t */	sleepable :1,	/* sleep if empty? */
	/* boolean_t */ exhaustible :1,	/* merely return if empty? */
	/* boolean_t */	expandable :1;	/* expand zone (with message)? */
	lock_data_t	complex_lock;	/* Lock for pageable zones */
	struct zone_free_space *
			free_space;	/* where to get new elements from */
	struct zone *	next_zone;	/* Link for all-zones list */
} *zone_t;