76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* $OpenBSD: mplock.h,v 1.13 2019/04/23 13:35:12 visa Exp $ */
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/*
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* Copyright (c) 2004 Niklas Hallqvist. All rights reserved.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _MPLOCK_H_
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#define _MPLOCK_H_
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#include <machine/mplock.h>
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#ifdef __USE_MI_MPLOCK
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#include <sys/_lock.h>
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struct __mp_lock_cpu {
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u_int mplc_ticket;
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u_int mplc_depth;
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};
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struct __mp_lock {
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struct __mp_lock_cpu mpl_cpus[MAXCPUS];
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volatile u_int mpl_ticket;
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u_int mpl_users;
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#ifdef WITNESS
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struct lock_object mpl_lock_obj;
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#endif
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};
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void ___mp_lock_init(struct __mp_lock *, const struct lock_type *);
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void __mp_lock(struct __mp_lock *);
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void __mp_unlock(struct __mp_lock *);
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int __mp_release_all(struct __mp_lock *);
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int __mp_release_all_but_one(struct __mp_lock *);
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void __mp_acquire_count(struct __mp_lock *, int);
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int __mp_lock_held(struct __mp_lock *, struct cpu_info *);
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#ifdef WITNESS
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#define __mp_lock_init(mpl) do { \
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static const struct lock_type __lock_type = { .lt_name = #mpl };\
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___mp_lock_init((mpl), &__lock_type); \
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} while (0)
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#else /* WITNESS */
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#define __mp_lock_init(mpl) ___mp_lock_init((mpl), NULL)
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#endif /* WITNESS */
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#endif /* __USE_MI_MPLOCK */
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extern struct __mp_lock kernel_lock;
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#endif /* !_MPLOCK_H */
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