osfmk/sys/time.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * HISTORY
  33  *
  34  * Revision 1.1.1.1  1998/09/22 21:05:48  wsanchez
  35  * Import of Mac OS X kernel (~semeria)
  36  *
  37  * Revision 1.1.1.1  1998/03/07 02:25:59  wsanchez
  38  * Import of OSF Mach kernel (~mburg)
  39  *
  40  * Revision 1.2.6.1  1994/09/23  03:13:17  ezf
  41  *      change marker to not FREE
  42  *      [1994/09/22  21:58:56  ezf]
  43  *
  44  * Revision 1.2.2.2  1993/06/09  02:55:33  gm
  45  *      Added to OSF/1 R1.3 from NMK15.0.
  46  *      [1993/06/02  21:31:02  jeffc]
  47  *
  48  * Revision 1.2  1993/04/19  17:17:07  devrcs
  49  *      Fixes for ANSI C
  50  *      [1993/02/26  14:02:46  sp]
  51  *
  52  * Revision 1.1  1992/09/30  02:36:58  robert
  53  *      Initial revision
  54  *
  55  * $EndLog$
  56  */
  57 /* CMU_HIST */
  58 /*
  59  * Revision 2.3  91/05/14  17:40:25  mrt
  60  *      Correcting copyright
  61  *
  62  * Revision 2.2  91/02/05  17:56:58  mrt
  63  *      Changed to new Mach copyright
  64  *      [91/02/01  17:49:29  mrt]
  65  *
  66  */
  67 /* CMU_ENDHIST */
  68 /*
  69  * Mach Operating System
  70  * Copyright (c) 1991 Carnegie Mellon University
  71  * All Rights Reserved.
  72  *
  73  * Permission to use, copy, modify and distribute this software and its
  74  * documentation is hereby granted, provided that both the copyright
  75  * notice and this permission notice appear in all copies of the
  76  * software, derivative works or modified versions, and any portions
  77  * thereof, and that both notices appear in supporting documentation.
  78  *
  79  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  80  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  81  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  82  *
  83  * Carnegie Mellon requests users of this software to return to
  84  *
  85  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  86  *  School of Computer Science
  87  *  Carnegie Mellon University
  88  *  Pittsburgh PA 15213-3890
  89  *
  90  * any improvements or extensions that they make and grant Carnegie Mellon rights
  91  * to redistribute these changes.
  92  */
  93 /*
  94  */
  95 /*
  96  *      Time-keeper for kernel IO devices.
  97  *
  98  *      May or may not have any relation to wall-clock time.
  99  */
 100
 101 #ifndef _SYS_TIME_H_
 102 #define _SYS_TIME_H_
 103 #include <mach/time_value.h>
 104
 105 extern time_value_t     time;
 106
 107 /*
 108  * Definitions to keep old code happy.
 109  */
 110 #define timeval_t time_value_t
 111 #define timeval time_value
 112 #define tv_sec  seconds
 113 #define tv_usec microseconds
 114
 115 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
 116 #define timercmp(tvp, uvp, cmp) \
 117         ((tvp)->tv_sec cmp (uvp)->tv_sec || \
 118          (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
 119 #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
 120 #endif /* _SYS_TIME_H_ */