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Annotation of 43BSD/ucb/gprof/hertz.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)hertz.c    5.1 (Berkeley) 6/4/85";
                      9: #endif not lint
                     10: 
                     11: #include <sys/time.h>
                     12: 
                     13:     /*
                     14:      * discover the tick frequency of the machine
                     15:      * if something goes wrong, we return 0, an impossible hertz.
                     16:      */
                     17: #define        HZ_WRONG        0
                     18: 
                     19: hertz()
                     20: {
                     21:        struct itimerval tim;
                     22: 
                     23:        tim.it_interval.tv_sec = 0;
                     24:        tim.it_interval.tv_usec = 1;
                     25:        tim.it_value.tv_sec = 0;
                     26:        tim.it_value.tv_usec = 0;
                     27:        setitimer(ITIMER_REAL, &tim, 0);
                     28:        setitimer(ITIMER_REAL, 0, &tim);
                     29:        if (tim.it_interval.tv_usec < 2)
                     30:                return(HZ_WRONG);
                     31:        return (1000000 / tim.it_interval.tv_usec);
                     32: }

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