117 lines
4.4 KiB
C
117 lines
4.4 KiB
C
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/* $NetBSD: lock.h,v 1.86 2010/07/01 13:00:57 hannken 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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/*
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* Copyright (c) 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code contains ideas from software contributed to Berkeley by
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* Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating
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* System project at Carnegie-Mellon University.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)lock.h 8.12 (Berkeley) 5/19/95
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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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/*
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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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#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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#define SPINLOCK_RUN_HOOK(count) ((count) >= SPINLOCK_BACKOFF_MAX)
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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_ */
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