sys/dev/raidframe/rf_fifo.h

   1 /*      $NetBSD: rf_fifo.h,v 1.4.18.1 2005/03/04 16:50:06 skrll Exp $   */
   2 /*
   3  * Copyright (c) 1995 Carnegie-Mellon University.
   4  * All rights reserved.
   5  *
   6  * Author: Mark Holland
   7  *
   8  * Permission to use, copy, modify and distribute this software and
   9  * its documentation is hereby granted, provided that both the copyright
  10  * notice and this permission notice appear in all copies of the
  11  * software, derivative works or modified versions, and any portions
  12  * thereof, and that both notices appear in supporting documentation.
  13  *
  14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  17  *
  18  * Carnegie Mellon requests users of this software to return to
  19  *
  20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  21  *  School of Computer Science
  22  *  Carnegie Mellon University
  23  *  Pittsburgh PA 15213-3890
  24  *
  25  * any improvements or extensions that they make and grant Carnegie the
  26  * rights to redistribute these changes.
  27  */
  28
  29 /*
  30  * rf_fifo.h --  prioritized FIFO queue code.
  31  *
  32  * 4-9-93 Created (MCH)
  33  */
  34
  35
  36 #ifndef _RF__RF_FIFO_H_
  37 #define _RF__RF_FIFO_H_
  38
  39 #include <dev/raidframe/raidframevar.h>
  40
  41 #include "rf_archs.h"
  42 #include "rf_diskqueue.h"
  43
  44 typedef struct RF_FifoHeader_s {
  45         RF_DiskQueueData_t *hq_head, *hq_tail;  /* high priority requests */
  46         RF_DiskQueueData_t *lq_head, *lq_tail;  /* low priority requests */
  47         int     hq_count, lq_count;     /* debug only */
  48 }       RF_FifoHeader_t;
  49
  50 extern void *
  51 rf_FifoCreate(RF_SectorCount_t sectPerDisk,
  52     RF_AllocListElem_t * clList, RF_ShutdownList_t ** listp);
  53 extern void
  54 rf_FifoEnqueue(void *q_in, RF_DiskQueueData_t * elem,
  55     int priority);
  56 extern RF_DiskQueueData_t *rf_FifoDequeue(void *q_in);
  57 extern RF_DiskQueueData_t *rf_FifoPeek(void *q_in);
  58 extern int
  59 rf_FifoPromote(void *q_in, RF_StripeNum_t parityStripeID,
  60     RF_ReconUnitNum_t which_ru);
  61
  62 #endif                          /* !_RF__RF_FIFO_H_ */