The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/time.h

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    1 /*
    2  * Mach Operating System
    3  * Copyright (c) 1991 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie Mellon rights
   24  * to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        time.h,v $
   29  * Revision 2.3  91/05/14  17:40:25  mrt
   30  *      Correcting copyright
   31  * 
   32  * Revision 2.2  91/02/05  17:56:58  mrt
   33  *      Changed to new Mach copyright
   34  *      [91/02/01  17:49:29  mrt]
   35  * 
   36  */
   37 /*
   38  *      Time-keeper for kernel IO devices.
   39  *
   40  *      May or may not have any relation to wall-clock time.
   41  */
   42 
   43 #ifndef _SYS_TIME_H_
   44 #define _SYS_TIME_H_
   45 #include <mach/time_value.h>
   46 
   47 extern time_value_t     time;
   48 
   49 /*
   50  * Definitions to keep old code happy.
   51  */
   52 #define timeval_t time_value_t
   53 #define timeval time_value
   54 #define tv_sec  seconds
   55 #define tv_usec microseconds
   56 
   57 #define timerisset(tvp)         ((tvp)->tv_sec || (tvp)->tv_usec)
   58 #define timercmp(tvp, uvp, cmp) \
   59         ((tvp)->tv_sec cmp (uvp)->tv_sec || \
   60          (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
   61 #define timerclear(tvp)         (tvp)->tv_sec = (tvp)->tv_usec = 0
   62 #endif _SYS_TIME_H_

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