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Annotation of 42BSD/usr.lib/libU77/dtime_.c, revision 1.1.1.1

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

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