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_ */