system/rtirq: Added (set priorities on kernel IRQ threads).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

system/rtirq/README

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+rtirq (set priorities on kernel IRQ threads)
+
+The rtirq script is a bash script written by Rui Nuno Capela which works
+in conjunction with the IRQ threading facility of the Linux kernel. The
+script takes advantage of the fact that the kernel can use threads for
+IRQs management, and as such these threads (like any other thread running
+on your system) can be given maximum priority in an effort to minimize
+the latency of audio peripherals.
+
+Modern kernels (3.0 and newer) incorporate IRQ threads, so there's no
+need for a patched kernel on Slackware 14.0 or newer. Older systems
+would need the realtime kernel patch.
+
+The script is installed as /etc/rc.d/rc.rtirq. To actually run it at
+boot time, add code like this to /etc/rc.d/rc.local:
+
+if [ -x /etc/rc.d/rc.rtirq ]; then
+  /etc/rc.d/rc.rtirq start
+fi
+
+The script can be disabled with "chmod -x /etc/rc.d/rc.rtirq".
+
+To enable IRQ threads, the option 'append="threadirqs"' needs to be
+added to the kernel section in /etc/lilo.conf. Example:
+
+# Linux bootable partition config begins
+image = /boot/vmlinuz-huge-3.10.17
+  root = /dev/sda1
+  label = Linux
+  append = "threadirqs"
+  read-only
+# Linux bootable partition config ends
+
+If there's already an 'append', add a space and 'threadirqs', like so:
+  append = "noapic acpi=off threadirqs"
+
+Don't forget to run lilo after editing lilo.conf. The threadirqs option
+will take effect on the next reboot.

system/rtirq/doinst.sh

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+config() {
+  NEW="$1"
+  OLD="$(dirname $NEW)/$(basename $NEW .new)"
+  # If there's no config file by that name, mv it over:
+  if [ ! -r $OLD ]; then
+    mv $NEW $OLD
+  elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
+    # toss the redundant copy
+    rm $NEW
+  fi
+  # Otherwise, we leave the .new copy for the admin to consider...
+}
+
+config etc/rtirq.conf.new

system/rtirq/rtirq.SlackBuild

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+#!/bin/sh
+
+# Slackware build script for rtirq
+
+# Written by B. Watson (yalhcru@gmail.com)
+
+# Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.
+
+PRGNAM=rtirq
+VERSION=${VERSION:-20130909}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i486" ]; then
+  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+ -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+mkdir -p $PKG/etc/rc.d
+install -m0644 $PRGNAM.conf $PKG/etc/$PRGNAM.conf.new
+install -m0755 $PRGNAM.sh $PKG/etc/rc.d/rc.$PRGNAM
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+
+# get rid of DOS line endings on LICENSE
+sed 's/\r//' LICENSE > $PKG/usr/doc/$PRGNAM-$VERSION/LICENSE
+
+cat $CWD/README > $PKG/usr/doc/$PRGNAM-$VERSION/README
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+cat $CWD/doinst.sh > $PKG/install/doinst.sh
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

system/rtirq/rtirq.info

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+PRGNAM="rtirq"
+VERSION="20130909"
+HOMEPAGE="http://alsa.opensrc.org/Rtirq"
+DOWNLOAD="http://www.rncbc.org/jack/rtirq-20130909.tar.gz"
+MD5SUM="5e455383e5dc508d4bd0a50d752946ab"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES=""
+MAINTAINER="B. Watson"
+EMAIL="yalhcru@gmail.com"

system/rtirq/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+     |-----handy-ruler------------------------------------------------------|
+rtirq: rtirq (set priorities on kernel IRQ threads)
+rtirq:
+rtirq: The rtirq script is a bash script written by Rui Nuno Capela which
+rtirq: works in conjunction with the IRQ threading facility of the Linux
+rtirq: kernel. The script takes advantage of the fact that the kernel can
+rtirq: use threads for IRQs management, and as such these threads (like any
+rtirq: other thread running on your system) can be given maximum priority
+rtirq: in an effort to minimize the latency of audio peripherals.
+rtirq:
+rtirq:
+rtirq: