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<HTML
><HEAD
><TITLE
>pthread_create</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>pthread_create</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>pthread_create -- create a thread</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_sched.h>
int <TT
CLASS="FUNCTION"
>pthread_create</TT
>(pthread_t <TT
CLASS="PARAMETER"
><I
>*thread</I
></TT
>, pthread_attr_t <TT
CLASS="PARAMETER"
><I
>*attr</I
></TT
>, void *<TT
CLASS="PARAMETER"
><I
>(*start_routine)(void *)</I
></TT
>, void <TT
CLASS="PARAMETER"
><I
>*arg</I
></TT
>);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN15"
></A
><H2
>DESCRIPTION</H2
><P
>This function is an RTLinux version of standard POSIX threads function.
<TT
CLASS="FUNCTION"
>pthread_create</TT
> creates a realtime thread that
will have attributes given by <TT
CLASS="PARAMETER"
><I
>attr</I
></TT
>, and that begins executing
function <TT
CLASS="FUNCTION"
>start_routine</TT
>(<TT
CLASS="PARAMETER"
><I
>arg </I
></TT
>). If the attribute is NULL,
default attributes are used.
The thread attributes in RTLinux are extended to allow thread creation on specific
processors (<TT
CLASS="FUNCTION"
>pthread_attr_setcpu_np</TT
>), to enable FPU operations
in the created thread (<TT
CLASS="FUNCTION"
>pthread_attr_setfp_np</TT
>).</P
><P
>The standard thread attribute setting functions supported include
<TT
CLASS="FUNCTION"
>pthread_attr_setschedparam</TT
>,
<TT
CLASS="FUNCTION"
>pthread_attr_setdetachstate</TT
>,
<TT
CLASS="FUNCTION"
>pthread_attr_setstacksize</TT
>,
<TT
CLASS="FUNCTION"
>pthread_attr_setstackaddr</TT
>.
The last call is to allow users to allocate memory for thread stacks
-- so that threads can be
created in RT operating mode by making use of pre-allocated memory.
<TT
CLASS="FUNCTION"
>pthread_join</TT
> should be used to synchronize freeing of
thread resources including memory. For example if a thread is created with
user allocated stack via <TT
CLASS="FUNCTION"
>pthread_attr_setstackaddr</TT
>, that
memory can only be safely reallocated after a <TT
CLASS="FUNCTION"
>pthread_join</TT
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN32"
></A
><H2
>RETURN VALUE</H2
><P
><TT
CLASS="FUNCTION"
>pthread_create</TT
> returns 0 on success and a non-zero error code on error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN36"
></A
><H2
>ERRORS</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>[EAGAIN]</DT
><DD
><P
>Either not enough memory, or
PTHREAD_THREADS_MAX would be exceeded, or pthread_create is called
from RT-thread context and preallocated stack use is not specified.</P
></DD
><DT
>[EINVAL]</DT
><DD
><P
> Bad attributes.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN47"
></A
><H2
>AUTHOR</H2
><P
>Victor Yodaiken (<A
HREF="mailto:support@fsmlabs.com"
TARGET="_top"
>support@fsmlabs.com</A
>)</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN51"
></A
><H2
>NOTES</H2
><P
>In the absense of preallocated stack (via <TT
CLASS="FUNCTION"
>pthread_attr_setstackaddr</TT
>), the use of this function is restricted to the Linux
<TT
CLASS="FUNCTION"
>init_module()</TT
> or <TT
CLASS="FUNCTION"
>cleanup_module()</TT
> context.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN57"
></A
><H2
>SEE ALSO</H2
><A
HREF="../susv2/xsh/pthread_create.html"
TARGET="_top"
>UNIX spec pthread_create(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_getstackaddr.html"
TARGET="_top"
>pthread_attr_setstackaddr(3)</A
>, <A
HREF="../susv2/xsh/pthread_attr_getstacksize.html"
TARGET="_top"
>pthread_attr_setstacksize(3)</A
>, <A
HREF="pthread_join.3.html"
TARGET="_top"
>pthread_join(3)</A
>, <A
HREF="pthread_make_periodic_np.3.html"
TARGET="_top"
>pthread_make_periodic_np(3)</A
>, <A
HREF="pthread_attr_setcpu_np.3.html"
TARGET="_top"
>pthread_attr_setcpu_np(3)</A
>, <A
HREF="pthread_attr_getcpu_np.3.html"
TARGET="_top"
>pthread_attr_getcpu_np(3)</A
>, <A
HREF="pthread_attr_setfp_np.3.html"
TARGET="_top"
>pthread_attr_setfp_np(3)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
