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Annotation of sys/dev/raidframe/rf_callback.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: rf_callback.h,v 1.3 2002/12/16 07:01:03 tdeval Exp $  */
        !             2: /*     $NetBSD: rf_callback.h,v 1.3 1999/02/05 00:06:06 oster Exp $    */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1995 Carnegie-Mellon University.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Author: Mark Holland
        !             9:  *
        !            10:  * Permission to use, copy, modify and distribute this software and
        !            11:  * its documentation is hereby granted, provided that both the copyright
        !            12:  * notice and this permission notice appear in all copies of the
        !            13:  * software, derivative works or modified versions, and any portions
        !            14:  * thereof, and that both notices appear in supporting documentation.
        !            15:  *
        !            16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
        !            18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  *
        !            22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  *
        !            27:  * any improvements or extensions that they make and grant Carnegie the
        !            28:  * rights to redistribute these changes.
        !            29:  */
        !            30:
        !            31: /*****************************************************************************
        !            32:  *
        !            33:  * rf_callback.h -- Header file for callback.c
        !            34:  *
        !            35:  * The reconstruction code must manage concurrent I/Os on multiple drives.
        !            36:  * It sometimes needs to suspend operation on a particular drive until some
        !            37:  * condition occurs. We can't block the thread, of course, or we wouldn't
        !            38:  * be able to manage our other outstanding I/Os. Instead we just suspend
        !            39:  * new activity on the indicated disk, and create a callback descriptor and
        !            40:  * put it someplace where it will get invoked when the condition that's
        !            41:  * stalling us has cleared. When the descriptor is invoked, it will call
        !            42:  * a function that will restart operation on the indicated disk.
        !            43:  *
        !            44:  *****************************************************************************/
        !            45:
        !            46: #ifndef        _RF__RF_CALLBACK_H_
        !            47: #define        _RF__RF_CALLBACK_H_
        !            48:
        !            49: #include "rf_types.h"
        !            50:
        !            51: struct RF_CallbackDesc_s {
        !            52:        void            (*callbackFunc) (RF_CBParam_t); /* Function to call. */
        !            53:        RF_CBParam_t      callbackArg;  /* Args to give to function, or */
        !            54:        RF_CBParam_t      callbackArg2; /* just info about this callback. */
        !            55:        RF_RowCol_t       row;          /* Disk row and column IDs to */
        !            56:        RF_RowCol_t       col;          /* give to the callback func. */
        !            57:        RF_CallbackDesc_t *next;        /* Next entry in list. */
        !            58: };
        !            59:
        !            60: int  rf_ConfigureCallback(RF_ShutdownList_t **);
        !            61: RF_CallbackDesc_t *rf_AllocCallbackDesc(void);
        !            62: void rf_FreeCallbackDesc(RF_CallbackDesc_t *);
        !            63:
        !            64: #endif /* !_RF__RF_CALLBACK_H_ */