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553cb3ed46
sys/param.h was manually adjusted to not define __NetBSD_Version__ since it will be defined by the compiler.
84 lines
2.6 KiB
C
Vendored
84 lines
2.6 KiB
C
Vendored
/* $NetBSD: lock.h,v 1.92 2022/07/24 20:28:39 riastradh Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2006, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, by Ross Harvey, and by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_LOCK_H_
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#define _SYS_LOCK_H_
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#include <sys/stdint.h>
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#include <sys/mutex.h>
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#include <machine/lock.h>
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#ifdef _KERNEL
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#ifdef _KERNEL_OPT
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#include "opt_lockdebug.h"
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#endif
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/*
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* From <machine/lock.h>.
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*/
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#ifndef SPINLOCK_SPIN_HOOK
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#define SPINLOCK_SPIN_HOOK
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#endif
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#ifndef SPINLOCK_BACKOFF_HOOK
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#include <sys/systm.h>
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#define SPINLOCK_BACKOFF_HOOK nullop(NULL)
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#endif
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#ifndef SPINLOCK_BACKOFF_MIN
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#define SPINLOCK_BACKOFF_MIN 4
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#endif
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#ifndef SPINLOCK_BACKOFF_MAX
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#define SPINLOCK_BACKOFF_MAX 128
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#endif
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#define SPINLOCK_BACKOFF(count) \
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do { \
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int __i; \
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for (__i = (count); __i != 0; __i--) { \
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SPINLOCK_BACKOFF_HOOK; \
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} \
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if ((count) < SPINLOCK_BACKOFF_MAX) \
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(count) += (count); \
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} while (/* CONSTCOND */ 0);
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#ifdef LOCKDEBUG
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#define SPINLOCK_SPINOUT(spins) ((spins)++ > 0x0fffffff)
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#else
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#define SPINLOCK_SPINOUT(spins) ((void)(spins), 0)
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#endif
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extern __cpu_simple_lock_t kernel_lock[];
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#endif /* _KERNEL */
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#endif /* _SYS_LOCK_H_ */ |