1 /*	$OpenBSD: rf_fifo.h,v 1.3 2002/12/16 07:01:04 tdeval Exp $	*/
2 /*	$NetBSD: rf_fifo.h,v 1.3 1999/02/05 00:06:11 oster Exp $	*/
3 
4 /*
5  * Copyright (c) 1995 Carnegie-Mellon University.
6  * All rights reserved.
7  *
8  * Author: Mark Holland
9  *
10  * Permission to use, copy, modify and distribute this software and
11  * its documentation is hereby granted, provided that both the copyright
12  * notice and this permission notice appear in all copies of the
13  * software, derivative works or modified versions, and any portions
14  * thereof, and that both notices appear in supporting documentation.
15  *
16  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19  *
20  * Carnegie Mellon requests users of this software to return to
21  *
22  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
23  *  School of Computer Science
24  *  Carnegie Mellon University
25  *  Pittsburgh PA 15213-3890
26  *
27  * any improvements or extensions that they make and grant Carnegie the
28  * rights to redistribute these changes.
29  */
30 
31 /*
32  * rf_fifo.h --  prioritized FIFO queue code.
33  *
34  * 4-9-93 Created (MCH)
35  */
36 
37 
38 #ifndef	_RF__RF_FIFO_H_
39 #define	_RF__RF_FIFO_H_
40 
41 #include "rf_archs.h"
42 #include "rf_types.h"
43 #include "rf_diskqueue.h"
44 
45 typedef struct RF_FifoHeader_s {
46 	RF_DiskQueueData_t *hq_head, *hq_tail;	/* high priority requests */
47 	RF_DiskQueueData_t *lq_head, *lq_tail;	/* low priority requests */
48 	int		    hq_count, lq_count;	/* debug only */
49 }	RF_FifoHeader_t;
50 
51 extern void *rf_FifoCreate(RF_SectorCount_t, RF_AllocListElem_t *,
52 	RF_ShutdownList_t **);
53 extern void rf_FifoEnqueue(void *, RF_DiskQueueData_t *, int);
54 extern RF_DiskQueueData_t *rf_FifoDequeue(void *);
55 extern RF_DiskQueueData_t *rf_FifoPeek(void *);
56 extern int rf_FifoPromote(void *, RF_StripeNum_t, RF_ReconUnitNum_t);
57 
58 #endif	/* !_RF__RF_FIFO_H_ */
59