[unix-history] / sys / sys / rlist.h

/*
* Copyright (c) 1992 William Jolitz. All rights reserved.
* Written by William Jolitz 1/92
*
* Redistribution and use in source and binary forms are freely permitted
* provided that the above copyright notice and attribution and date of work
* and this paragraph are duplicated in all such forms.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Resource lists.
*
*      Usage:
*              rlist_free(&swapmap, 100, 200); add space to swapmap
*              rlist_alloc(&swapmap, 100, &loc); obtain 100 sectors from swap
* $Header: /usr/bill/working/sys/sys/RCS/rlist.h,v 1.2 92/01/21 21:23:48 william Exp $
*/

/* A resource list element. */
struct rlist {
       unsigned        rl_start;       /* boundaries of extent - inclusive */
       unsigned        rl_end;         /* boundaries of extent - inclusive */
       struct rlist    *rl_next;       /* next list entry, if present */
};

/* Functions to manipulate resource lists.  */
extern rlist_free __P((struct rlist **, unsigned, unsigned));
int rlist_alloc __P((struct rlist **, unsigned, unsigned *));
extern rlist_destroy __P((struct rlist **));


/* heads of lists */
struct rlist *swapmap;