FreeBSD/Linux Kernel Cross Reference
sys/i386/include/physio_proc.h

     /*      $FreeBSD$       */
     /*      $NecBSD: physio_proc.h,v 3.4 1999/07/23 20:47:03 honda Exp $    */
     /*      $NetBSD$        */
     
     /*
      * [NetBSD for NEC PC-98 series]
      *  Copyright (c) 1998
      *      NetBSD/pc98 porting staff. All rights reserved.
      * 
     *  Redistribution and use in source and binary forms, with or without
     *  modification, are permitted provided that the following conditions
     *  are met:
     *  1. Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *  2. Redistributions in binary form must reproduce the above copyright
     *     notice, this list of conditions and the following disclaimer in the
     *     documentation and/or other materials provided with the distribution.
     *  3. The name of the author may not be used to endorse or promote products
     *     derived from this software without specific prior written permission.
     * 
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    #ifndef _I386_PHYSIO_PROC_H_
    #define _I386_PHYSIO_PROC_H_
    #include <sys/buf.h>
    #include <sys/queue.h>
    
    struct physio_proc;
    TAILQ_HEAD(physio_proc_head, physio_proc);
    struct physio_proc_head physio_proc_freet, physio_proc_busyt;
    
    struct physio_proc {
            TAILQ_ENTRY(physio_proc) pp_chain;
            struct proc *pp_proc;
    };
    
    static __inline struct physio_proc *physio_proc_enter __P((struct buf *));
    static __inline void physio_proc_leave __P((struct physio_proc *));
    
    static __inline struct physio_proc *
    physio_proc_enter(bp)
            struct buf *bp;
    {
            struct physio_proc *pp;
            int s;
    
            if (bp == NULL || (bp->b_flags & B_PHYS) == 0)
                    return NULL;    
            if ((pp = physio_proc_freet.tqh_first) == NULL)
                    return NULL;
    
            s = splstatclock();
            TAILQ_REMOVE(&physio_proc_freet, pp, pp_chain);
    #if !defined(__FreeBSD__) || __FreeBSD_version < 400001
            pp->pp_proc = bp->b_proc;
    #endif
            TAILQ_INSERT_TAIL(&physio_proc_busyt, pp, pp_chain);
            splx(s);
            return pp;
    }
    
    static __inline void
    physio_proc_leave(pp)
            struct physio_proc *pp;
    {
            int s;
    
            if (pp == NULL)
                    return;
    
            s = splstatclock();
            TAILQ_REMOVE(&physio_proc_busyt, pp, pp_chain);
            TAILQ_INSERT_TAIL(&physio_proc_freet, pp, pp_chain);
            pp->pp_proc = NULL;
            splx(s);
    }
    
    void physio_proc_init __P((void));
    #endif /* _I386_PHYSIO_PROC_H_ */

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