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rf_fifo.h revision 1.2 
      1 /*	$NetBSD: rf_fifo.h,v 1.2 1999/01/26 02:33:57 oster 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 (at) 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 "rf_archs.h"
     40 #include "rf_types.h"
     41 #include "rf_diskqueue.h"
     42 
     43 typedef struct RF_FifoHeader_s {
     44     RF_DiskQueueData_t *hq_head, *hq_tail;	/* high priority requests */
     45     RF_DiskQueueData_t *lq_head, *lq_tail;	/* low priority requests */
     46     int                 hq_count, lq_count; /* debug only */
     47 } RF_FifoHeader_t;
     48 
     49 extern void *rf_FifoCreate(RF_SectorCount_t sectPerDisk,
     50 	RF_AllocListElem_t *clList, RF_ShutdownList_t **listp);
     51 extern void rf_FifoEnqueue(void *q_in, RF_DiskQueueData_t *elem,
     52 	int priority);
     53 extern RF_DiskQueueData_t *rf_FifoDequeue(void *q_in);
     54 extern RF_DiskQueueData_t *rf_FifoPeek(void *q_in);
     55 extern int rf_FifoPromote(void *q_in, RF_StripeNum_t parityStripeID,
     56 	RF_ReconUnitNum_t which_ru);
     57 
     58 #endif /* !_RF__RF_FIFO_H_ */
     59