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rf_callback.h revision 1.1 
      1 /*	$NetBSD: rf_callback.h,v 1.1 1998/11/13 04:20:26 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  *
     31  * callback.h -- header file for callback.c
     32  *
     33  * the reconstruction code must manage concurrent I/Os on multiple drives.
     34  * it sometimes needs to suspend operation on a particular drive until some
     35  * condition occurs.  we can't block the thread, of course, or we wouldn't
     36  * be able to manage our other outstanding I/Os.  Instead we just suspend
     37  * new activity on the indicated disk, and create a callback descriptor and
     38  * put it someplace where it will get invoked when the condition that's
     39  * stalling us has cleared.  When the descriptor is invoked, it will call
     40  * a function that will restart operation on the indicated disk.
     41  *
     42  ****************************************************************************************/
     43 
     44 /* :
     45  * Log: rf_callback.h,v
     46  * Revision 1.8  1996/08/01 15:57:28  jimz
     47  * minor cleanup
     48  *
     49  * Revision 1.7  1996/07/27  23:36:08  jimz
     50  * Solaris port of simulator
     51  *
     52  * Revision 1.6  1996/06/10  11:55:47  jimz
     53  * Straightened out some per-array/not-per-array distinctions, fixed
     54  * a couple bugs related to confusion. Added shutdown lists. Removed
     55  * layout shutdown function (now subsumed by shutdown lists).
     56  *
     57  * Revision 1.5  1996/05/23  21:46:35  jimz
     58  * checkpoint in code cleanup (release prep)
     59  * lots of types, function names have been fixed
     60  *
     61  * Revision 1.4  1996/05/18  19:51:34  jimz
     62  * major code cleanup- fix syntax, make some types consistent,
     63  * add prototypes, clean out dead code, et cetera
     64  *
     65  * Revision 1.3  1996/05/17  16:30:46  jimz
     66  * add prototypes
     67  *
     68  * Revision 1.2  1995/12/01  15:15:55  root
     69  * added copyright info
     70  *
     71  */
     72 
     73 #ifndef _RF__RF_CALLBACK_H_
     74 #define _RF__RF_CALLBACK_H_
     75 
     76 #include "rf_types.h"
     77 
     78 struct RF_CallbackDesc_s {
     79   void              (*callbackFunc)(RF_CBParam_t); /* function to call */
     80   RF_CBParam_t        callbackArg;     /* args to give to function, or just info about this callback  */
     81   RF_CBParam_t        callbackArg2;
     82   RF_RowCol_t         row;             /* disk row and column IDs to give to the callback func */
     83   RF_RowCol_t         col;
     84   RF_CallbackDesc_t  *next;            /* next entry in list */
     85 };
     86 
     87 int                 rf_ConfigureCallback(RF_ShutdownList_t **listp);
     88 RF_CallbackDesc_t  *rf_AllocCallbackDesc(void);
     89 void                rf_FreeCallbackDesc(RF_CallbackDesc_t *p);
     90 
     91 #endif /* !_RF__RF_CALLBACK_H_ */
     92