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<HTML
><HEAD
><TITLE
>clock_gethrtime</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>clock_gethrtime</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>clock_gethrtime -- get high resolution time using the specified clock</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN8"
></A
><H2
>Synopsis</H2
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
> #include <rtl_time.h>
hrtime_t <TT
CLASS="FUNCTION"
>clock_gethrtime</TT
>(clockid_t <TT
CLASS="PARAMETER"
><I
>clock</I
></TT
>);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN12"
></A
><H2
>DESCRIPTION</H2
><P
>This function is a non-portable RTLinux extension. <TT
CLASS="FUNCTION"
>clock_gethrtime</TT
> returns the clock reading in nanoseconds. This is a convenience function for <TT
CLASS="FUNCTION"
>clock_gettime(3)</TT
></P
><P
><TT
CLASS="PARAMETER"
><I
>hrtime_t</I
></TT
> is a 64-bit signed integer.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN19"
></A
><H2
>NOTES</H2
><P
>The following clocks are supported by this release of RTLinux:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>CLOCK_REALTIME</DT
><DD
><P
>This is the standard POSIX realtime clock. The values
returned by clock_gettime for this clock represent the
time elapsed since the Epoch. This clock can be adjusted with
the <TT
CLASS="FUNCTION"
>clock_settime(3)</TT
> function.</P
></DD
><DT
>CLOCK_MONOTONIC</DT
><DD
><P
>This POSIX clock runs at a steady rate, and is never
adjusted or reset.</P
></DD
><DT
>CLOCK_RTL_SCHED</DT
><DD
><P
>The clock that the scheduler uses for task scheduling.
The time values passed to pthread_make_periodic_np are normally specified
relative to this clock.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN36"
></A
><H2
>AUTHOR</H2
><P
>Michael Barabanov (<A
HREF="mailto:baraban@fsmlabs.com"
TARGET="_top"
>baraban@fsmlabs.com</A
>)</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN40"
></A
><H2
>SEE ALSO</H2
><A
HREF="rtl_getschedclock.3.html"
TARGET="_top"
>rtl_getschedclock(3)</A
>, <A
HREF="rtl_setclockmode.3.html"
TARGET="_top"
>rtl_setclockmode(3)</A
>, <A
HREF="../susv2/xsh/clock_gettime.html"
TARGET="_top"
>UNIX spec clock_gettime(3)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
