/* * 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 <stat_time.h> #include <kern/kern_types.h> /* * Definitions for high resolution timers. A check * word on the high portion allows atomic updates. */ struct timer { #if !STAT_TIME uint64_t tstamp; #endif /* STAT_TIME */ #if defined(__LP64__) uint64_t all_bits; #else uint32_t low_bits; uint32_t high_bits; uint32_t high_bits_check; #endif }; typedef struct timer timer_data_t, *timer_t; /* * Exported kernel interface to timers */ #if STAT_TIME #include <kern/macro_help.h> /* Advance a timer by a 32 bit value */ #define TIMER_BUMP(timer, ticks) \ MACRO_BEGIN \ uint32_t old_low, low; \ \ old_low = (timer)->low_bits; \ low = old_low + (ticks); \ if (low < old_low) \ timer_update((timer), (timer)->high_bits + 1, low); \ else \ (timer)->low_bits = low; \ MACRO_END #define timer_start(timer, tstamp) #define timer_stop(timer, tstamp) #define timer_switch(timer, tstamp, new_timer) #define thread_timer_event(tstamp, new_timer) #else /* STAT_TIME */ #define TIMER_BUMP(timer, ticks) /* Start a timer by setting the timestamp */ extern void timer_start( timer_t timer, uint64_t tstamp); /* Stop a timer by updating from the timestamp */ extern void timer_stop( timer_t timer, uint64_t tstamp); /* Update the timer and start a new one */ extern void timer_switch( timer_t timer, uint64_t tstamp, timer_t new_timer); /* Update the thread timer at an event */ extern void thread_timer_event( uint64_t tstamp, timer_t new_timer); #endif /* STAT_TIME */ /* Initialize a timer */ extern void timer_init( timer_t timer); /* Update a saved timer value and return delta to current value */ extern uint64_t timer_delta( timer_t timer, uint64_t *save); /* Advance a timer by a 64 bit value */ extern void timer_advance( timer_t timer, uint64_t delta); /* * Exported hardware interface to timers */ /* Read timer value */ #if defined(__LP64__) static inline uint64_t timer_grab( timer_t timer) { return timer->all_bits; } #else extern uint64_t timer_grab( timer_t timer); /* Update timer value */ extern void timer_update( timer_t timer, uint32_t new_high, uint32_t new_low); #endif /* defined(__LP64__) */ #endif /* _KERN_TIMER_H_ */