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Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)hertz.c    5.3 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include <sys/time.h>
        !            23: 
        !            24:     /*
        !            25:      * discover the tick frequency of the machine
        !            26:      * if something goes wrong, we return 0, an impossible hertz.
        !            27:      */
        !            28: #define        HZ_WRONG        0
        !            29: 
        !            30: hertz()
        !            31: {
        !            32:        struct itimerval tim;
        !            33: 
        !            34:        tim.it_interval.tv_sec = 0;
        !            35:        tim.it_interval.tv_usec = 1;
        !            36:        tim.it_value.tv_sec = 0;
        !            37:        tim.it_value.tv_usec = 0;
        !            38:        setitimer(ITIMER_REAL, &tim, 0);
        !            39:        setitimer(ITIMER_REAL, 0, &tim);
        !            40:        if (tim.it_interval.tv_usec < 2)
        !            41:                return(HZ_WRONG);
        !            42:        return (1000000 / tim.it_interval.tv_usec);
        !            43: }

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