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Annotation of kernel/kern/clock.h, revision 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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