gethrtime man page on HP-UX

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gethrtime(3C)							 gethrtime(3C)

       gethrtime() - get high resolution time

       The  function  returns  the current high-resolution real time.  Time is
       expressed as nanoseconds since a certain time in the  past.   This  API
       uses a fast light weight system call to get the nanoseconds from a cer‐
       tain time.  It is not correlated in any way to the time	of  day.  This
       API is used for performance measurement tasks and is used for cheap and
       accurate interval timing.

       is a signed 64-bit number.

       Upon successful completion, returns a number  of	 nanoseconds.	Other‐
       wise, a value of -1 is returned.

       This API will only be available if the application is being compiled in
       -Ae mode (extended ANSI) because 64-bit integer numbers are not	avail‐
       able in -Aa (ANSI) mode. Please refer to cc(1).

       When  the  time returned from is obtained in each of the two threads of
       execution, a comparison of the two return values may give  the  appear‐
       ance  that  time	 is  different across each of the threads and may even
       appear to be going backwards.

       The following code fragment measures the average cost of

	    hrtime_t begin, end;

	    int i, count = 1000;

	    begin = gethrtime();

	    for (i = 0; i < count; i++)


	    end = gethrtime();

	    printf("Avg getgid() time = %lld nsec", (end - begin)/count );


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