sys/dev/raidframe/rf_callback.h

   1 /*      $NetBSD: rf_callback.h,v 1.4.18.3 2004/09/21 13:32:50 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  *
  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 #ifndef _RF__RF_CALLBACK_H_
  45 #define _RF__RF_CALLBACK_H_
  46
  47 #include <dev/raidframe/raidframevar.h>
  48
  49 struct RF_CallbackDesc_s {
  50         void    (*callbackFunc) (RF_CBParam_t); /* function to call */
  51         RF_CBParam_t callbackArg;       /* args to give to function, or just
  52                                          * info about this callback  */
  53         RF_RowCol_t col;        /* column IDs to give to the callback func */
  54         RF_CallbackDesc_t *next;/* next entry in list */
  55 };
  56
  57 int     rf_ConfigureCallback(RF_ShutdownList_t ** listp);
  58 RF_CallbackDesc_t *rf_AllocCallbackDesc(void);
  59 void    rf_FreeCallbackDesc(RF_CallbackDesc_t * p);
  60
  61 #endif                          /* !_RF__RF_CALLBACK_H_ */