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/*
* Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* $Id: spinlock.h,v 1.2 1999/01/08 08:25:37 d Exp $
* $OpenBSD: spinlock.h,v 1.2 1999/01/08 08:25:37 d Exp $
*
* Lock definitions used in both libc and libpthread.
*
*/
#ifndef _SPINLOCK_H_
#define _SPINLOCK_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/spinlock.h>
/*
* Lock structure with room for debugging information.
*/
typedef struct {
volatile _spinlock_lock_t access_lock;
volatile void * lock_owner;
volatile const char * fname;
volatile int lineno;
} spinlock_t;
#define _SPINLOCK_INITIALIZER { _SPINLOCK_UNLOCKED, 0, 0, 0 }
#define _SPINUNLOCK(_lck) (_lck)->access_lock = _SPINLOCK_UNLOCKED
#ifdef _LOCK_DEBUG
#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__)
#else
#define _SPINLOCK(_lck) _spinlock(_lck)
#endif
/*
* Thread function prototype definitions:
*/
__BEGIN_DECLS
void _spinlock __P((spinlock_t *));
void _spinlock_debug __P((spinlock_t *, const char *, int));
/* lock() functions return 0 if lock was acquired. */
/* is_locked functions() return 1 if lock is locked. */
int _atomic_lock __P((volatile _spinlock_lock_t *));
int _atomic_is_locked __P((volatile _spinlock_lock_t *));
int _thread_slow_atomic_lock __P((volatile _spinlock_lock_t *));
int _thread_slow_atomic_is_locked __P((volatile _spinlock_lock_t *));
__END_DECLS
#endif /* _SPINLOCK_H_ */
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