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Annotation of kernel/kern/clock.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  * Copyright (c) 1995 NeXT Computer, Inc.
                     27:  *
                     28:  * Interim clock/timer control API.
                     29:  *
                     30:  * HISTORY
                     31:  *
                     32:  * 4 June 1995 ? at NeXT
                     33:  *     Created.
                     34:  */
                     35: 
                     36: #ifndef        _KERN_CLOCK_H_
                     37: #define        _KERN_CLOCK_H_
                     38: 
                     39: #import <mach/clock_types.h>
                     40: #import <machdep/machine/mach_param.h>
                     41: #import <kern/macro_help.h>
                     42: 
                     43: #define TICKS_PER_SEC  HZ
                     44: #define NSEC_PER_TICK  (NSEC_PER_SEC/TICKS_PER_SEC)
                     45: 
                     46: #define TVALSPEC_SEC_MAX       (0 - 1)
                     47: #define TVALSPEC_NSEC_MAX      (NSEC_PER_SEC - 1)
                     48: 
                     49: #define TVALSPEC_MAX   ((tvalspec_t) { TVALSPEC_SEC_MAX, TVALSPEC_NSEC_MAX } )
                     50: #define TVALSPEC_ZERO  ((tvalspec_t) { 0, 0 } )
                     51: 
                     52: #define ADD_TVALSPEC_NSEC(t1, nsec)                                    \
                     53: MACRO_BEGIN                                                            \
                     54:        (t1)->tv_nsec += (clock_res_t)(nsec);                           \
                     55:        if ((clock_res_t)(nsec) > 0 && (t1)->tv_nsec >= NSEC_PER_SEC) { \
                     56:                (t1)->tv_nsec -= NSEC_PER_SEC;                          \
                     57:                (t1)->tv_sec += 1;                                      \
                     58:        }                                                               \
                     59:        else if ((clock_res_t)(nsec) < 0 && (t1)->tv_nsec < 0) {        \
                     60:                (t1)->tv_nsec += NSEC_PER_SEC;                          \
                     61:                (t1)->tv_sec -= 1;                                      \
                     62:        }                                                               \
                     63: MACRO_END
                     64: 
                     65: #define UPDATE_MAPPED_TVALSPEC(mtv, tv)                                \
                     66: MACRO_BEGIN                                                    \
                     67:        if ((mtv) != 0) {                                       \
                     68:                (mtv)->mtv_csec = (tv)->tv_sec;                 \
                     69:                (mtv)->mtv_nsec = (tv)->tv_nsec;                \
                     70:                (mtv)->mtv_sec = (tv)->tv_sec;                  \
                     71:        }                                                       \
                     72: MACRO_END
                     73: 
                     74: extern tvalspec_t ticks_to_tvalspec(
                     75:        unsigned int    ticks);
                     76: 
                     77: typedef enum {
                     78:        Calendar,       /* assumed battery back-up */
                     79:        System          /* assumed "highest resolution available" */
                     80: } clock_type_t;
                     81: 
                     82: extern tvalspec_t clock_get_counter(
                     83:        clock_type_t    which_clock);
                     84: 
                     85: extern void clock_set_counter(
                     86:        clock_type_t    which_clock,
                     87:        tvalspec_t      value);
                     88: 
                     89: extern void clock_adjust_counter(
                     90:        clock_type_t    which_clock,
                     91:        clock_res_t     nsec);
                     92: 
                     93: extern mapped_tvalspec_t *clock_map_counter(
                     94:        clock_type_t    which_clock);
                     95: 
                     96: typedef enum {
                     97:        SystemWide      /* system-wide event timer */
                     98: } timer_type_t;
                     99: 
                    100: extern void timer_set_deadline(
                    101:        timer_type_t    which_timer,
                    102:        tvalspec_t      deadline);
                    103: 
                    104: typedef void   (*timer_func_t)(
                    105:        tvalspec_t      timestamp);
                    106: 
                    107: extern void timer_set_expire_func(
                    108:        timer_type_t    which_timer,
                    109:        timer_func_t    func);                                          
                    110: 
                    111: #endif /* _KERN_CLOCK_H_ */

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