lock.h

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    1 /*      $NetBSD: lock.h,v 1.92 2022/07/24 20:28:39 riastradh Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 1999, 2000, 2006, 2007 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
    9  * NASA Ames Research Center, by Ross Harvey, and by Andrew Doran.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #ifndef _SYS_LOCK_H_
   34 #define _SYS_LOCK_H_
   35 
   36 #include <sys/stdint.h>
   37 #include <sys/mutex.h>
   38 
   39 #include <machine/lock.h>
   40 
   41 #ifdef _KERNEL
   42 
   43 #ifdef _KERNEL_OPT
   44 #include "opt_lockdebug.h"
   45 #endif
   46 
   47 /*
   48  * From <machine/lock.h>.
   49  */
   50 #ifndef SPINLOCK_SPIN_HOOK
   51 #define SPINLOCK_SPIN_HOOK
   52 #endif
   53 #ifndef SPINLOCK_BACKOFF_HOOK
   54 #include <sys/systm.h>
   55 #define SPINLOCK_BACKOFF_HOOK           nullop(NULL)
   56 #endif
   57 #ifndef SPINLOCK_BACKOFF_MIN
   58 #define SPINLOCK_BACKOFF_MIN    4
   59 #endif
   60 #ifndef SPINLOCK_BACKOFF_MAX
   61 #define SPINLOCK_BACKOFF_MAX    128
   62 #endif
   63 
   64 #define SPINLOCK_BACKOFF(count)                                 \
   65 do {                                                            \
   66         int __i;                                                \
   67         for (__i = (count); __i != 0; __i--) {                  \
   68                 SPINLOCK_BACKOFF_HOOK;                          \
   69         }                                                       \
   70         if ((count) < SPINLOCK_BACKOFF_MAX)                     \
   71                 (count) += (count);                             \
   72 } while (/* CONSTCOND */ 0);
   73 
   74 #ifdef LOCKDEBUG
   75 #define SPINLOCK_SPINOUT(spins)         ((spins)++ > 0x0fffffff)
   76 #else
   77 #define SPINLOCK_SPINOUT(spins)         ((void)(spins), 0)
   78 #endif
   79 
   80 extern __cpu_simple_lock_t kernel_lock[];
   81 
   82 #endif /* _KERNEL */
   83 
   84 #endif /* _SYS_LOCK_H_ */

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

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