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/* $OpenBSD: rf_callback.h,v 1.2 1999/02/16 00:02:24 niklas Exp $ */
/* $NetBSD: rf_callback.h,v 1.3 1999/02/05 00:06:06 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 "rf_types.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_ */
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