115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/* $NetBSD: rf_fifo.h,v 1.1 1998/11/13 04:20:30 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* rf_fifo.h -- prioritized FIFO queue code.
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*
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* 4-9-93 Created (MCH)
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*/
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/*
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* :
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* Log: rf_fifo.h,v
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* Revision 1.12 1996/06/18 20:53:11 jimz
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* fix up disk queueing (remove configure routine,
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* add shutdown list arg to create routines)
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*
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* Revision 1.11 1996/06/13 20:41:28 jimz
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* add random queueing
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*
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* Revision 1.10 1996/06/13 20:38:28 jimz
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* add random dequeue, peek
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*
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* Revision 1.9 1996/06/09 02:36:46 jimz
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* lots of little crufty cleanup- fixup whitespace
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* issues, comment #ifdefs, improve typing in some
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* places (esp size-related)
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*
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* Revision 1.8 1996/06/07 22:26:27 jimz
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* type-ify which_ru (RF_ReconUnitNum_t)
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*
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* Revision 1.7 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.6 1996/05/30 23:22:16 jimz
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* bugfixes of serialization, timing problems
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* more cleanup
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*
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* Revision 1.5 1996/05/30 11:29:41 jimz
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* Numerous bug fixes. Stripe lock release code disagreed with the taking code
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* about when stripes should be locked (I made it consistent: no parity, no lock)
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* There was a lot of extra serialization of I/Os which I've removed- a lot of
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* it was to calculate values for the cache code, which is no longer with us.
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* More types, function, macro cleanup. Added code to properly quiesce the array
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* on shutdown. Made a lot of stuff array-specific which was (bogusly) general
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* before. Fixed memory allocation, freeing bugs.
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*
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* Revision 1.4 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.3 1995/12/01 18:22:26 root
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* added copyright info
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*
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* Revision 1.2 1995/11/07 15:31:57 wvcii
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* added Peek() function
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*
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*/
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#ifndef _RF__RF_FIFO_H_
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#define _RF__RF_FIFO_H_
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#include "rf_archs.h"
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#include "rf_types.h"
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#include "rf_diskqueue.h"
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typedef struct RF_FifoHeader_s {
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RF_DiskQueueData_t *hq_head, *hq_tail; /* high priority requests */
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RF_DiskQueueData_t *lq_head, *lq_tail; /* low priority requests */
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int hq_count, lq_count; /* debug only */
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#if !defined(KERNEL) && RF_INCLUDE_QUEUE_RANDOM > 0
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long rval; /* next random number (random qpolicy) */
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#endif /* !KERNEL && RF_INCLUDE_QUEUE_RANDOM > 0 */
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} RF_FifoHeader_t;
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extern void *rf_FifoCreate(RF_SectorCount_t sectPerDisk,
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RF_AllocListElem_t *clList, RF_ShutdownList_t **listp);
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extern void rf_FifoEnqueue(void *q_in, RF_DiskQueueData_t *elem,
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int priority);
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extern RF_DiskQueueData_t *rf_FifoDequeue(void *q_in);
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extern RF_DiskQueueData_t *rf_FifoPeek(void *q_in);
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extern int rf_FifoPromote(void *q_in, RF_StripeNum_t parityStripeID,
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RF_ReconUnitNum_t which_ru);
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#if !defined(KERNEL) && RF_INCLUDE_QUEUE_RANDOM > 0
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extern RF_DiskQueueData_t *rf_RandomDequeue(void *q_in);
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extern RF_DiskQueueData_t *rf_RandomPeek(void *q_in);
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#endif /* !KERNEL && RF_INCLUDE_QUEUE_RANDOM > 0 */
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#endif /* !_RF__RF_FIFO_H_ */
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