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<HTML
><HEAD
><TITLE
>rtl_allow_interrupts</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"></HEAD
><BODY
CLASS="REFENTRY"
><H1
><A
NAME="AEN1"
>rtl_allow_interrupts</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>rtl_no_interrupts, rtl_restore_interrupts, rtl_stop_interrupts, rtl_allow_interrupts -- control the CPU interrupt state</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN11"
></A
><H2
>Synopsis</H2
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="SYNOPSIS"
> #include <rtl_sync.h>
void <TT
CLASS="FUNCTION"
>rtl_no_interrupts</TT
>(rtl_irqstate_t <TT
CLASS="PARAMETER"
><I
>state</I
></TT
>);
void <TT
CLASS="FUNCTION"
>rtl_restore_interrupts</TT
>(rtl_irqstate_t <TT
CLASS="PARAMETER"
><I
>state</I
></TT
>);
void <TT
CLASS="FUNCTION"
>rtl_stop_interrupts</TT
>();
void <TT
CLASS="FUNCTION"
>rtl_allow_interrupts</TT
>(); </PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN19"
></A
><H2
>DESCRIPTION</H2
><P
>These functions are non-portable Realtime Linux extensions.</P
><P
><TT
CLASS="FUNCTION"
>rtl_no_interrupts</TT
> saves the current state of the processor interrupt flags in the variable <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> and then disables the interrupts on this processor.</P
><P
><TT
CLASS="FUNCTION"
>rtl_restore_interrupts</TT
> is defined as a macro. It uses its argument to restore the interrupt state previously saved with <TT
CLASS="FUNCTION"
>rtl_no_interrupts</TT
>.</P
><P
><TT
CLASS="FUNCTION"
>rtl_stop_interrupts</TT
> disables the interrupts.</P
><P
><TT
CLASS="FUNCTION"
>rtl_allow_interrupts</TT
> enables the interrupts.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN32"
></A
><H2
>EXAMPLE</H2
><P
>The following example demonstrates a typical usage.</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> {
rtl_irqstate_t irqstate;
rtl_no_interrupts(irqstate);
/* this code runs with interrupts disabled! */
rtl_restore_interrupts(irqstate);
/* interrupt state is back to what it was before */
}</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN36"
></A
><H2
>NOTES</H2
><P
>These functions only affect the interrupt flags of the current processor.</P
><P
>Be sure to disable hardware interrupts for short periods of time only. Do not enable interrupts in a hard signal/interrupt handler unless you
really know what you are doing.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN40"
></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="AEN44"
></A
><H2
>SEE ALSO</H2
><A
HREF="rtl_request_irq.3.html"
TARGET="_top"
>rtl_request_irq(3)</A
>, <A
HREF="rtl_free_irq.3.html"
TARGET="_top"
>rtl_free_irq(3)</A
>, <A
HREF="rtl_hard_enable_irq.3.html"
TARGET="_top"
>rtl_hard_enable_irq(3)</A
>, <A
HREF="rtl_hard_disable_irq.3.html"
TARGET="_top"
>rtl_hard_disable_irq(3)</A
><P
>2001 FSMLabs Inc.</P
><P
>All rights reserved.</P
></DIV
></BODY
></HTML
>
|
