/*
* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The 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_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
*/
/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
*/
#ifndef _KERN_TIMER_H_
#define _KERN_TIMER_H_
#include <kern/kern_types.h>
/*
* Definitions for high resolution timers.
*/
#if __LP64__
#define TIMER_ALIGNMENT
#else
#define TIMER_ALIGNMENT __attribute__((packed, aligned(4)))
#endif
struct timer {
uint64_t tstamp;
#if defined(__LP64__)
uint64_t all_bits;
#else /* defined(__LP64__) */
/* A check word on the high portion allows atomic updates. */
uint32_t low_bits;
uint32_t high_bits;
uint32_t high_bits_check;
#endif /* !defined(__LP64__) */
} TIMER_ALIGNMENT;
typedef struct timer timer_data_t, *timer_t;
/*
* Initialize the `timer`.
*/
void timer_init(timer_t timer);
/*
* Start the `timer` at time `tstamp`.
*/
void timer_start(timer_t timer, uint64_t tstamp);
/*
* Stop the `timer` and update it with time `tstamp`.
*/
void timer_stop(timer_t timer, uint64_t tstamp);
/*
* Update the `timer` at time `tstamp`, leaving it running.
*/
void timer_update(timer_t timer, uint64_t tstamp);
/*
* Read the accumulated time of `timer`.
*/
#if defined(__LP64__)
static inline
uint64_t
timer_grab(timer_t timer)
{
return timer->all_bits;
}
#else /* defined(__LP64__) */
uint64_t timer_grab(timer_t timer);
#endif /* !defined(__LP64__) */
#endif /* _KERN_TIMER_H_ */