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/*
* Copyright (c) 2007 Artur Grabowski <art@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MACHINE_MPLOCK_H_
#define _MACHINE_MPLOCK_H_
#include <sys/_lock.h>
struct __mp_lock_cpu {
u_int mplc_ticket;
u_int mplc_depth;
};
struct __mp_lock {
struct __mp_lock_cpu mpl_cpus[MAXCPUS];
volatile u_int mpl_ticket;
u_int mpl_users;
#ifdef WITNESS
struct lock_object mpl_lock_obj;
#endif
};
#ifndef _LOCORE
void ___mp_lock_init(struct __mp_lock *);
void ___mp_lock(struct __mp_lock * LOCK_FL_VARS);
void ___mp_unlock(struct __mp_lock * LOCK_FL_VARS);
int ___mp_release_all(struct __mp_lock * LOCK_FL_VARS);
int ___mp_release_all_but_one(struct __mp_lock * LOCK_FL_VARS);
void ___mp_acquire_count(struct __mp_lock *, int LOCK_FL_VARS);
int __mp_lock_held(struct __mp_lock *);
#ifdef WITNESS
void _mp_lock_init(struct __mp_lock *, struct lock_type *);
#define __mp_lock_init(mpl) do { \
static 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 */
#define __mp_lock(mpl) ___mp_lock((mpl) LOCK_FILE_LINE)
#define __mp_unlock(mpl) ___mp_unlock((mpl) LOCK_FILE_LINE)
#define __mp_release_all(mpl) \
___mp_release_all((mpl) LOCK_FILE_LINE)
#define __mp_release_all_but_one(mpl) \
___mp_release_all_but_one((mpl) LOCK_FILE_LINE)
#define __mp_acquire_count(mpl, count) \
___mp_acquire_count((mpl), (count) LOCK_FILE_LINE)
#endif
#endif /* !_MACHINE_MPLOCK_H */
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