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	1	/*
	2	* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/*
	24	* Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991
	25	* All Rights Reserved
	26	*
	27	* Permission to use, copy, modify, and distribute this software and
	28	* its documentation for any purpose and without fee is hereby granted,
	29	* provided that the above copyright notice appears in all copies and
	30	* that both the copyright notice and this permission notice appear in
	31	* supporting documentation.
	32	*
	33	* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
	34	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	35	* FOR A PARTICULAR PURPOSE.
	36	*
	37	* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
	38	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
	39	* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
	40	* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
	41	* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	42	*
	43	*/
	44	/*
	45	* MkLinux
	46	*/
	47
	48	/*
	49	* POSIX Threads - IEEE 1003.1c
	50	*/
	51
	52	#ifndef _POSIX_PTHREAD_SPINLOCK_H
	53	#define _POSIX_PTHREAD_SPINLOCK_H
	54
	55	#include <mach/mach.h>
	56	#define __APPLE_API_PRIVATE
	57	#include <machine/cpu_capabilities.h>
	58
	59	#ifndef __POSIX_LIB__
	60	#define __POSIX_LIB__
	61	#endif
	62
	63	#include "pthread_machdep.h" /* Machine-dependent definitions. */
	64
	65	/* Number of times to spin when the lock is unavailable and we are on a
	66	multiprocessor. On a uniprocessor we yield the processor immediately. */
	67	#define MP_SPIN_TRIES 1000
	68	extern int _spin_tries;
	69	extern int __is_threaded;
	70
	71	/* Internal mutex locks for data structures */
	72	#define TRY_LOCK(v) (!__is_threaded \|\| _spin_lock_try((pthread_lock_t *)&(v)))
	73
	74	/* _DO_SPINLOCK_LOCK() takes a (pthread_lock_t ) /
	75	#define _DO_SPINLOCK_LOCK(v) _spin_lock(v)
	76
	77	/* _DO_SPINLOCK_UNLOCK() takes a (pthread_lock_t ) /
	78	#define _DO_SPINLOCK_UNLOCK(v) _spin_unlock(v)
	79
	80	/* LOCK() takes a (pthread_lock_t) */
	81	#define LOCK(v) \
	82	do { \
	83	if (__is_threaded) { \
	84	_DO_SPINLOCK_LOCK((pthread_lock_t *)&(v)); \
	85	} \
	86	} while (0)
	87
	88	/* UNLOCK() takes a (pthread_lock_t) */
	89	#define UNLOCK(v) \
	90	do { \
	91	if (__is_threaded) { \
	92	_DO_SPINLOCK_UNLOCK((pthread_lock_t *)&(v)); \
	93	} \
	94	} while (0)
	95
	96	/* Prototypes. */
	97
	98	/* Functions defined in machine-dependent files. */
	99	extern void _spin_lock(pthread_lock_t *lockp);
	100	extern int _spin_lock_try(pthread_lock_t *lockp);
	101	extern void _spin_unlock(pthread_lock_t *lockp);
	102
	103	#endif /* _POSIX_PTHREAD_SPINLOCK_H */