mplock.h

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    1 /*      $OpenBSD: mplock.h,v 1.13 2019/04/23 13:35:12 visa Exp $        */
    2 
    3 /*
    4  * Copyright (c) 2004 Niklas Hallqvist.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #ifndef _MPLOCK_H_
   28 #define _MPLOCK_H_
   29 
   30 #include <machine/mplock.h>
   31 
   32 #ifdef __USE_MI_MPLOCK
   33 
   34 #include <sys/_lock.h>
   35 
   36 struct __mp_lock_cpu {
   37         u_int                   mplc_ticket;
   38         u_int                   mplc_depth;
   39 };
   40 
   41 struct __mp_lock {
   42         struct __mp_lock_cpu    mpl_cpus[MAXCPUS];
   43         volatile u_int          mpl_ticket;
   44         u_int                   mpl_users;
   45 #ifdef WITNESS
   46         struct lock_object      mpl_lock_obj;
   47 #endif
   48 };
   49 
   50 void    ___mp_lock_init(struct __mp_lock *, const struct lock_type *);
   51 void    __mp_lock(struct __mp_lock *);
   52 void    __mp_unlock(struct __mp_lock *);
   53 int     __mp_release_all(struct __mp_lock *);
   54 int     __mp_release_all_but_one(struct __mp_lock *);
   55 void    __mp_acquire_count(struct __mp_lock *, int);
   56 int     __mp_lock_held(struct __mp_lock *, struct cpu_info *);
   57 
   58 #ifdef WITNESS
   59 
   60 #define __mp_lock_init(mpl) do {                                        \
   61         static const struct lock_type __lock_type = { .lt_name = #mpl };\
   62         ___mp_lock_init((mpl), &__lock_type);                           \
   63 } while (0)
   64 
   65 #else /* WITNESS */
   66 
   67 #define __mp_lock_init(mpl)     ___mp_lock_init((mpl), NULL)
   68 
   69 #endif /* WITNESS */
   70 
   71 #endif /* __USE_MI_MPLOCK */
   72 
   73 extern struct __mp_lock kernel_lock;
   74 
   75 #endif /* !_MPLOCK_H */

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FreeBSD/Linux Kernel Cross Reference sys/sys/mplock.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/mplock.h