FreeBSD/Linux Kernel Cross Reference
sys/dev/raidframe/rf_callback.h

     /*      $NetBSD: rf_callback.h,v 1.5 2004/03/03 13:29:00 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_RowCol_t col;        /* column IDs to give to the callback func */
            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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