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Annotation of 43BSD/usr.lib/libU77/dtime_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)dtime_.c    5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Returns the delta time since the last call to dtime.
        !            11:  *
        !            12:  * calling sequence:
        !            13:  *     real time(2)
        !            14:  *     call dtime(time)
        !            15:  * where:
        !            16:  *     the 2 element array time will receive the user and system
        !            17:  *     elapsed time since the last call to dtime, or since the start
        !            18:  *     of execution.
        !            19:  *
        !            20:  * This routine can be called as function, and returns the sum of
        !            21:  * user and system times. The time_array argument must always be given.
        !            22:  *
        !            23:  * The resolution for all timing is 1/60 second.
        !            24:  */
        !            25: 
        !            26: #include <sys/types.h>
        !            27: #include <sys/times.h>
        !            28: 
        !            29: struct tb { float usrtime; float systime; };
        !            30: 
        !            31: time_t dutime=0, dstime=0;
        !            32: 
        !            33: float
        !            34: dtime_(dt) struct tb *dt;
        !            35: {      struct tms clock;
        !            36: 
        !            37:        times(&clock);
        !            38:        dt->usrtime = (float)(clock.tms_utime - dutime) / 60.0;
        !            39:        dt->systime = (float)(clock.tms_stime - dstime) / 60.0;
        !            40:        dutime = clock.tms_utime;
        !            41:        dstime = clock.tms_stime;
        !            42:        return(dt->usrtime + dt->systime);
        !            43: }

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