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#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.2).
# To extract the files from this archive, save it to some FILE, remove
# everything before the `!/bin/sh' line above, then type `sh FILE'.
#
# Made on 2000-03-19 15:00 EST by <jcej@chiroptera.tragus.org>.
# Source directory was `/home/jcej/projects/ACE_wrappers/docs/tutorials/010'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode name
# ------ ---------- ------------------------------------------
# 440 -rw-rw-r-- hdr
# 49 -rw-rw-r-- bodies
# 2242 -rw-rw-r-- page01.pre
# 84 -rw-rw-r-- page02.pre
# 231 -rw-rw-r-- page03.pre
# 138 -rw-rw-r-- page04.pre
# 606 -rw-rw-r-- page05.pre
# 1493 -rw-rw-r-- page06.pre
# 444 -rw-rw-r-- page07.pre
# 689 -rw-rw-r-- page02.pst
# 236 -rw-rw-r-- page03.pst
# 387 -rw-rw-r-- page04.pst
# 647 -rw-rw-r-- page05.pst
#
save_IFS="${IFS}"
IFS="${IFS}:"
gettext_dir=FAILED
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for dir in $PATH
do
if test "$gettext_dir" = FAILED && test -f $dir/gettext \
&& ($dir/gettext --version >/dev/null 2>&1)
then
set `$dir/gettext --version 2>&1`
if test "$3" = GNU
then
gettext_dir=$dir
fi
fi
if test "$locale_dir" = FAILED && test -f $dir/shar \
&& ($dir/shar --print-text-domain-dir >/dev/null 2>&1)
then
locale_dir=`$dir/shar --print-text-domain-dir`
fi
done
IFS="$save_IFS"
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then
echo=echo
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export TEXTDOMAINDIR
TEXTDOMAIN=sharutils
export TEXTDOMAIN
echo="$gettext_dir/gettext -s"
fi
touch -am 1231235999 $$.touch >/dev/null 2>&1
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shar_touch=touch
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shar_touch=:
echo
$echo 'WARNING: not restoring timestamps. Consider getting and'
$echo "installing GNU \`touch', distributed in GNU File Utilities..."
echo
fi
rm -f 1231235999 $$.touch
#
if mkdir _sh32552; then
$echo 'x -' 'creating lock directory'
else
$echo 'failed to create lock directory'
exit 1
fi
# ============= hdr ==============
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else
$echo 'x -' extracting 'hdr' '(text)'
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<HTML>
<HEAD>
X <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
X <META NAME="Author" CONTENT="James CE Johnson">
X <TITLE>ACE Tutorial 010</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
X
<CENTER><B><FONT SIZE=+2>ACE Tutorial 010</FONT></B></CENTER>
X
<CENTER><B><FONT SIZE=+2>Passing chunks of data through an ACE_Message_Queue</FONT></B></CENTER>
X
X
<P>
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'hdr' &&
chmod 0664 'hdr' ||
$echo 'restore of' 'hdr' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'hdr:' 'MD5 check failed'
e3d97df3787127f8678ec95f024c44c6 hdr
SHAR_EOF
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# ============= bodies ==============
if test -f 'bodies' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'bodies' '(file already exists)'
else
$echo 'x -' extracting 'bodies' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'bodies' &&
PAGE=2
message_queue.cpp
block.h
task.h
task.cpp
SHAR_EOF
$shar_touch -am 0124153399 'bodies' &&
chmod 0664 'bodies' ||
$echo 'restore of' 'bodies' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'bodies:' 'MD5 check failed'
888c8b85427980776f703176da1f9ee4 bodies
SHAR_EOF
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test 49 -eq "$shar_count" ||
$echo 'bodies:' 'original size' '49,' 'current size' "$shar_count!"
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# ============= page01.pre ==============
if test -f 'page01.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page01.pre' '(file already exists)'
else
$echo 'x -' extracting 'page01.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page01.pre' &&
<P>
In an earlier tutorial we briefly introduced ACE_Message_Queue. In this
tutorial we'll go into a bit more detail.
<P>
ACE_Message_Queue is modeled after Unix System V IPC mechanisms. The basic
idea is that you put a block of data into one end of the Queue and take it
out of the other end. Your basic FIFO in other words. The SysV mechanism
works great for passing these blocks of data between processes on the same
host but it's a bit overkill for moving blocks between threads. You could
use a pipe, socket or similar mechanism but that still has more overhead than
we really want just for moving data between threads. Process-global memory
is a good technique but then you need a way to signal the "listening" threads.
The ACE_Message_Queue is a better approach: Create blocks of data and enqueue
them in one thread while another thread (or threads) dequeue and perform work.
<P>
Kirthika's Abstract:
<UL>
The Message Queue is a FIFO accessible from multiple threads.
That is, a thread puts the produced blocks of data on the message queue
to be consumed by some other thread/threads and processed. In this
tutorial, we see how effectively the Message Queue in a ACE_Task can be
used to pass data among threads in the thread pool.
(this is very similar to
<A HREF="../007/page01.html">Tutorial 7</A>
X wherein we implemented a
thread-pool server).Here, actual data is passed between the threads and
also an ACE_Barrier has been used to provide synchronisation among
multiple threads.
<P>
The Message Queue consists of Message Blocks, each of which has a read
and write pointer. Using these pointers the message blocks can be
accessed for reading and writing operations. The ACE_Task::svc() method
will put the block onto the queue without bothering about the existence
of a consumer for that block. A thread from the thread pool obtains the
block from the queue, and checks to see whether the block_type is
MB_HANGUP. If so, it puts the block back on the queue for its
peers and exits. Otherwise, it reads the block and processes it before
releasing it.
<P>
This simple tutorial makes us aware of the usage and importance of the
Message Queue which could be used to our advantage especially for
multithreaded applications.
</UL>
SHAR_EOF
$shar_touch -am 03191459100 'page01.pre' &&
chmod 0664 'page01.pre' ||
$echo 'restore of' 'page01.pre' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'page01.pre:' 'MD5 check failed'
a59ecff5ebb6cd48d96531f70c504ffc page01.pre
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page01.pre'`"
test 2242 -eq "$shar_count" ||
$echo 'page01.pre:' 'original size' '2242,' 'current size' "$shar_count!"
fi
fi
# ============= page02.pre ==============
if test -f 'page02.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page02.pre' '(file already exists)'
else
$echo 'x -' extracting 'page02.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page02.pre' &&
X
We'll look first at <A HREF="message_queue.cpp">main()</A>.
<P>
X
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'page02.pre' &&
chmod 0664 'page02.pre' ||
$echo 'restore of' 'page02.pre' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'page02.pre:' 'MD5 check failed'
166bf09c6c4474767e95ef4a7be20a03 page02.pre
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page02.pre'`"
test 84 -eq "$shar_count" ||
$echo 'page02.pre:' 'original size' '84,' 'current size' "$shar_count!"
fi
fi
# ============= page03.pre ==============
if test -f 'page03.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page03.pre' '(file already exists)'
else
$echo 'x -' extracting 'page03.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page03.pre' &&
Our <A HREF="block.h">Block</A> object is a very simple derivative
of the ACE_Message_Block. The only reason I created it was to prove
that the message blocks to, indeed, get freed when we're done with 'em.
<P>
X
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'page03.pre' &&
chmod 0664 'page03.pre' ||
$echo 'restore of' 'page03.pre' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'page03.pre:' 'MD5 check failed'
3164732c254de8d97fac8fd52071ae32 page03.pre
SHAR_EOF
else
shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page03.pre'`"
test 231 -eq "$shar_count" ||
$echo 'page03.pre:' 'original size' '231,' 'current size' "$shar_count!"
fi
fi
# ============= page04.pre ==============
if test -f 'page04.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page04.pre' '(file already exists)'
else
$echo 'x -' extracting 'page04.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page04.pre' &&
Our <A HREF="task.h">Task</A> object executes in one or more threads
and reads from the message queue it contains.
<P>
X
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'page04.pre' &&
chmod 0664 'page04.pre' ||
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