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