1 /* $NetBSD: rf_callback.h,v 1.4 2001/10/04 15:58:51 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@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_CBParam_t callbackArg2; 54 RF_RowCol_t row; /* disk row and column IDs to give to the 55 * callback func */ 56 RF_RowCol_t col; 57 RF_CallbackDesc_t *next;/* next entry in list */ 58 }; 59 60 int rf_ConfigureCallback(RF_ShutdownList_t ** listp); 61 RF_CallbackDesc_t *rf_AllocCallbackDesc(void); 62 void rf_FreeCallbackDesc(RF_CallbackDesc_t * p); 63 64 #endif /* !_RF__RF_CALLBACK_H_ */ 65