spinlock.h

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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.
 *
 * $FreeBSD: src/lib/libc/include/spinlock.h,v 1.7 2003/11/05 18:17:30 deischen Exp $
 *
 * Lock definitions used in both libc and libpthread.
 *
 */
 
#ifndef _SPINLOCK_H_
#define _SPINLOCK_H_
//#include <sys/cdefs.h>
#include <sys/types.h>
 
/*
 * Lock structure with room for debugging information.
 */
struct _spinlock {
    volatile long   access_lock;
    volatile long   lock_owner;
    volatile char   *fname;
    volatile int    lineno;
};
typedef struct _spinlock spinlock_t;
 
#define _SPINLOCK_INITIALIZER   { 0, 0, 0, 0 }
 
#define _SPINUNLOCK(_lck)   _spinunlock(_lck);
#ifdef  _LOCK_DEBUG
#define _SPINLOCK(_lck)     _spinlock_debug(_lck, __FILE__, __LINE__)
#else
#define _SPINLOCK(_lck)     _spinlock(_lck)
#endif
 
/*
 * Thread function prototype definitions:
 */
__BEGIN_DECLS
long    _atomic_lock(volatile long *);
void    _spinlock(spinlock_t *);
void    _spinunlock(spinlock_t *);
void    _spinlock_debug(spinlock_t *, char *, int);
__END_DECLS
 
#endif /* _SPINLOCK_H_ */