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/* $OpenBSD: rf_fifo.h,v 1.1 1999/01/11 14:29:23 niklas Exp $ */
/* $NetBSD: rf_fifo.h,v 1.1 1998/11/13 04:20:30 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* 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 the
* rights to redistribute these changes.
*/
/*
* rf_fifo.h -- prioritized FIFO queue code.
*
* 4-9-93 Created (MCH)
*/
/*
* :
* Log: rf_fifo.h,v
* Revision 1.12 1996/06/18 20:53:11 jimz
* fix up disk queueing (remove configure routine,
* add shutdown list arg to create routines)
*
* Revision 1.11 1996/06/13 20:41:28 jimz
* add random queueing
*
* Revision 1.10 1996/06/13 20:38:28 jimz
* add random dequeue, peek
*
* Revision 1.9 1996/06/09 02:36:46 jimz
* lots of little crufty cleanup- fixup whitespace
* issues, comment #ifdefs, improve typing in some
* places (esp size-related)
*
* Revision 1.8 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.7 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.6 1996/05/30 23:22:16 jimz
* bugfixes of serialization, timing problems
* more cleanup
*
* Revision 1.5 1996/05/30 11:29:41 jimz
* Numerous bug fixes. Stripe lock release code disagreed with the taking code
* about when stripes should be locked (I made it consistent: no parity, no lock)
* There was a lot of extra serialization of I/Os which I've removed- a lot of
* it was to calculate values for the cache code, which is no longer with us.
* More types, function, macro cleanup. Added code to properly quiesce the array
* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
* before. Fixed memory allocation, freeing bugs.
*
* Revision 1.4 1996/05/23 21:46:35 jimz
* checkpoint in code cleanup (release prep)
* lots of types, function names have been fixed
*
* Revision 1.3 1995/12/01 18:22:26 root
* added copyright info
*
* Revision 1.2 1995/11/07 15:31:57 wvcii
* added Peek() function
*
*/
#ifndef _RF__RF_FIFO_H_
#define _RF__RF_FIFO_H_
#include "rf_archs.h"
#include "rf_types.h"
#include "rf_diskqueue.h"
typedef struct RF_FifoHeader_s {
RF_DiskQueueData_t *hq_head, *hq_tail; /* high priority requests */
RF_DiskQueueData_t *lq_head, *lq_tail; /* low priority requests */
int hq_count, lq_count; /* debug only */
#if !defined(KERNEL) && RF_INCLUDE_QUEUE_RANDOM > 0
long rval; /* next random number (random qpolicy) */
#endif /* !KERNEL && RF_INCLUDE_QUEUE_RANDOM > 0 */
} RF_FifoHeader_t;
extern void *rf_FifoCreate(RF_SectorCount_t sectPerDisk,
RF_AllocListElem_t *clList, RF_ShutdownList_t **listp);
extern void rf_FifoEnqueue(void *q_in, RF_DiskQueueData_t *elem,
int priority);
extern RF_DiskQueueData_t *rf_FifoDequeue(void *q_in);
extern RF_DiskQueueData_t *rf_FifoPeek(void *q_in);
extern int rf_FifoPromote(void *q_in, RF_StripeNum_t parityStripeID,
RF_ReconUnitNum_t which_ru);
#if !defined(KERNEL) && RF_INCLUDE_QUEUE_RANDOM > 0
extern RF_DiskQueueData_t *rf_RandomDequeue(void *q_in);
extern RF_DiskQueueData_t *rf_RandomPeek(void *q_in);
#endif /* !KERNEL && RF_INCLUDE_QUEUE_RANDOM > 0 */
#endif /* !_RF__RF_FIFO_H_ */
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