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<HTML
><HEAD
><TITLE
>pthread_attr_setcpu_np</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>pthread_attr_setcpu_np</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>pthread_attr_setcpu_np, pthread_attr_getcpu_np -- examine and change the CPU pthread attribute</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN9"
></A
><H2
>Synopsis</H2
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
> #include <rtl_sched.h>
int <TT
CLASS="FUNCTION"
>pthread_attr_setcpu_np</TT
>(pthread_attr_t <TT
CLASS="PARAMETER"
><I
>*attr</I
></TT
>, int <TT
CLASS="PARAMETER"
><I
>cpu</I
></TT
>);
int <TT
CLASS="FUNCTION"
>pthread_attr_getcpu_np</TT
>(pthread_attr_t <TT
CLASS="PARAMETER"
><I
>*attr</I
></TT
>, int <TT
CLASS="PARAMETER"
><I
>*cpu</I
></TT
>);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN17"
></A
><H2
>DESCRIPTION</H2
><P
>These functions are non-portable RTLinux extensions. On SMP machines they allow a thread to be scheduled on a specific CPU.
The RTLinux scheduler
does not try to guess what thread belongs to what CPU. The default
processor is the processor where a thread is created,
but RTLinux really wants the
application to tell it where to run threads.</P
><P
><TT
CLASS="FUNCTION"
>pthread_attr_setcpu_np</TT
> modifies the thread attribute object <I
CLASS="EMPHASIS"
>attribute</I
> so that the created thread would be scheduled on the CPU with id <I
CLASS="EMPHASIS"
>cpu</I
> (as displayed in <I
CLASS="EMPHASIS"
>/proc/cpuinfo</I
>). The thread attribute object <I
CLASS="EMPHASIS"
>attr</I
> first has to be initialized with <TT
CLASS="FUNCTION"
>pthread_attr_init(3)</TT
>.</P
><P
><TT
CLASS="FUNCTION"
>pthread_attr_getcpu_np</TT
> fills the location pointed to by <TT
CLASS="PARAMETER"
><I
>cpu</I
></TT
> with the CPU id from the attribute structure.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN30"
></A
><H2
>RETURN VALUE</H2
><P
>All functions return 0 on success and a non-zero error code on error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN33"
></A
><H2
>ERRORS</H2
><P
><TT
CLASS="FUNCTION"
>pthread_attr_setcpu_np</TT
> returns <I
CLASS="EMPHASIS"
>EINVAL</I
> if the specified CPU does not exist in the system.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN38"
></A
><H2
>NOTES</H2
><P
>If <TT
CLASS="FUNCTION"
>pthread_attr_setcpu_np</TT
> was not used on the attribute object passed to <TT
CLASS="FUNCTION"
>pthread_create</TT
>, the thread is scheduled on the current CPU.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN43"
></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="AEN47"
></A
><H2
>SEE ALSO</H2
><A
HREF="../susv2/xsh/pthread_attr_getstacksize.html"
TARGET="_top"
>UNIX spec pthread_attr_getstacksize(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_setstacksize.html"
TARGET="_top"
>UNIX spec pthread_attr_setstacksize(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_setschedparam.html"
TARGET="_top"
>UNIX spec pthread_attr_setschedparam(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_init.html"
TARGET="_top"
>UNIX spec pthread_attr_init(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_getschedparam.html"
TARGET="_top"
>UNIX spec pthread_attr_getschedparam(3)</A
>, <A
HREF="../susv2/xsh/pthread_create.html"
TARGET="_top"
>UNIX spec pthread_create(3)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
