/*
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * Copyright (c) 1999-2001 Apple Computer, Inc.  All Rights Reserved. The
 * contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License.  Please
 * obtain a copy of the License at http://www.apple.com/publicsource and
 * read it before using this file.
 *
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.  Please
 * see the License for the specific language governing rights and
 * limitations under the License.
 *
 *
 * @APPLE_LICENSE_HEADER_END@
 *
 */
/*
 *
 *	History:
 *		11-Feb-1999 Umesh Vaishampayan (umeshv@apple.com)
 *			Added atomic_or().
 *
 *		26-Oct-1998 Umesh Vaishampayan (umeshv@apple.com)
 *			Made the header c++ friendly.
 *
 *		12-Oct-1998	Umesh Vaishampayan (umeshv@apple.com)
 *			Changed simple_ to spin_ so as to coexist with cthreads till
 *			the merge to the system framework.
 *
 *		8-Oct-1998	Umesh Vaishampayan (umeshv@apple.com)
 *			Created from the kernel code to be in a dynamic shared library.
 *			Kernel code created by: Bill Angell	(angell@apple.com)
 */

#ifndef _ATOMIC_H_
#define _ATOMIC_H_

#ifdef __cplusplus
extern "C" {
#endif

/* Locking routines */

struct spin_lock {			/* sizeof cache line */
	unsigned int lock_data;
	unsigned int pad[7];
};

typedef struct spin_lock *spin_lock_t;

extern void spin_lock_init(spin_lock_t);

extern void spin_lock_unlock(spin_lock_t);

extern unsigned int spin_lock_lock(spin_lock_t);

extern unsigned int spin_lock_bit(spin_lock_t, unsigned int bits);

extern unsigned int spin_unlock_bit(spin_lock_t, unsigned int bits);

extern unsigned int spin_lock_try(spin_lock_t);

extern unsigned int spin_lock_held(spin_lock_t);

/* Other atomic routines */

extern unsigned int compare_and_store(unsigned int oval,
								unsigned int nval, unsigned int *area);

extern unsigned int atomic_add(unsigned int *area, int val);

extern unsigned int atomic_or(unsigned int *area, unsigned int mask);

extern unsigned int atomic_sub(unsigned int *area, int val);

extern void queue_atomic(unsigned int *anchor,
					unsigned int *elem, unsigned int disp);

extern void queue_atomic_list(unsigned int *anchor,
						unsigned int *first, unsigned int *last,
						unsigned int disp);

extern unsigned int *dequeue_atomic(unsigned int *anchor, unsigned int disp);

#ifdef __cplusplus
}
#endif

#endif /* _ATOMIC_H_ */
