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/* $OpenBSD: mplock.h,v 1.5 2019/04/23 13:35:12 visa Exp $ */
/*
* Copyright (c) 2004 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MACHINE_MPLOCK_H_
#define _MACHINE_MPLOCK_H_
/*
* Really simple spinlock implementation with recursive capabilities.
* Correctness is paramount, no fancyness allowed.
*/
#define MPL_LOCKED 0
#define MPL_UNLOCKED 1
struct __mp_lock {
volatile int mpl_lock[4];
volatile struct cpu_info *mpl_cpu;
volatile long mpl_count;
#ifdef WITNESS
struct lock_object mpl_lock_obj;
#endif
};
#ifndef _LOCORE
void ___mp_lock_init(struct __mp_lock *);
void __mp_lock(struct __mp_lock *);
void __mp_unlock(struct __mp_lock *);
int __mp_release_all(struct __mp_lock *);
int __mp_release_all_but_one(struct __mp_lock *);
void __mp_acquire_count(struct __mp_lock *, int);
int __mp_lock_held(struct __mp_lock *, struct cpu_info *);
#ifdef WITNESS
void _mp_lock_init(struct __mp_lock *, const struct lock_type *);
#define __mp_lock_init(mpl) do { \
static const struct lock_type __lock_type = { .lt_name = #mpl };\
_mp_lock_init((mpl), &__lock_type); \
} while (0)
#else /* WITNESS */
#define __mp_lock_init ___mp_lock_init
#endif /* WITNESS */
#endif
#endif /* !_MACHINE_MPLOCK_H */
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