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<HTML
><HEAD
><TITLE
>gethrtime</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>gethrtime</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN9"
></A
><H2
>Name</H2
>gethrtime -- get high resolution time</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN12"
></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"
>gethrtime</TT
>(void);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN15"
></A
><H2
>Description</H2
><P
>This function is a non-portable RTLinux extension. <TT
CLASS="FUNCTION"
>gethrtime</TT
> returns the time in nanoseconds since the system bootup. This time is never reset or adjusted. <TT
CLASS="FUNCTION"
>gethrtime</TT
> always gives monotonically increasing values. <TT
CLASS="PARAMETER"
><I
>hrtime_t</I
></TT
> is a 64-bit signed integer.</P
><P
>The <TT
CLASS="PARAMETER"
><I
>HRTIME_INFINITY</I
></TT
> symbol represents the maximum possible value that <TT
CLASS="FUNCTION"
>gethrtime()</TT
> could possibly return. This value will be never reached during the execution of the system, and can be used to designate the infinitely distant moment in time.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN24"
></A
><H2
>Notes</H2
><P
>The actual resolution of <TT
CLASS="FUNCTION"
>gethrtime</TT
> is hardware-dependent. It is guaranteed to be better than 1 microsecond.</P
><P
><TT
CLASS="FUNCTION"
>gethrtime</TT
> is available in PSC, the user-level
real-time signal library. It can be called from handlers installed via
<A
HREF="rtlinux_sigaction.3.html"
TARGET="_top"
>rtlinux_sigaction(3)</A
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN31"
></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="AEN35"
></A
><H2
>See Also</H2
><A
HREF="../susv2/xsh/clock_gettime.html"
TARGET="_top"
>UNIX spec clock_gettime(3)</A
>, <A
HREF="clock_gethrtime.3.html"
TARGET="_top"
>clock_gethrtime(3)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
