osfmk/sys/time.h

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