text: /*	$NetBSD: rf_callback.h,v 1.4 2001/10/04 15:58:51 oster Exp $	*/
  /*
   * Copyright (c) 1995 Carnegie-Mellon University.
   * All rights reserved.
   *
   * Author: Mark Holland
   *
   * Permission to use, copy, modify and distribute this software and
   * its documentation is hereby granted, provided that both the copyright
   * notice and this permission notice appear in all copies of the
   * software, derivative works or modified versions, and any portions
   * thereof, and that both notices appear in supporting documentation.
   *
   * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   *
   * Carnegie Mellon requests users of this software to return to
   *
   *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   *  School of Computer Science
   *  Carnegie Mellon University
   *  Pittsburgh PA 15213-3890
   *
   * any improvements or extensions that they make and grant Carnegie the
   * rights to redistribute these changes.
   */
  
  /*****************************************************************************************
   *
   * callback.h -- header file for callback.c
   *
   * the reconstruction code must manage concurrent I/Os on multiple drives.
   * it sometimes needs to suspend operation on a particular drive until some
   * condition occurs.  we can't block the thread, of course, or we wouldn't
   * be able to manage our other outstanding I/Os.  Instead we just suspend
   * new activity on the indicated disk, and create a callback descriptor and
   * put it someplace where it will get invoked when the condition that's
   * stalling us has cleared.  When the descriptor is invoked, it will call
   * a function that will restart operation on the indicated disk.
   *
   ****************************************************************************************/
  
  #ifndef _RF__RF_CALLBACK_H_
  #define _RF__RF_CALLBACK_H_
  
  #include <dev/raidframe/raidframevar.h>
  
  struct RF_CallbackDesc_s {
  	void    (*callbackFunc) (RF_CBParam_t);	/* function to call */
  	RF_CBParam_t callbackArg;	/* args to give to function, or just
  					 * info about this callback  */
  	RF_CBParam_t callbackArg2;
  	RF_RowCol_t row;	/* disk row and column IDs to give to the
  				 * callback func */
  	RF_RowCol_t col;
  	RF_CallbackDesc_t *next;/* next entry in list */
  };
  
  int     rf_ConfigureCallback(RF_ShutdownList_t ** listp);
  RF_CallbackDesc_t *rf_AllocCallbackDesc(void);
  void    rf_FreeCallbackDesc(RF_CallbackDesc_t * p);
  
  #endif				/* !_RF__RF_CALLBACK_H_ */
  