combine.shar

这是广泛使用的通信开源项目,对于大容量,高并发的通讯要求完全能够胜任,他广泛可用于网络游戏医学图像网关的高qos要求.更详细的内容可阅读相应的材料

  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 \
    || $echo 'page03.pre:' 'MD5 check failed'
40dd465ac9815a2c35375ccdbad0c98b  page03.pre
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page03.pre'`"
    test 507 -eq "$shar_count" ||
    $echo 'page03.pre:' 'original size' '507,' 'current size' "$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' &&
<P><A HREF="client_handler.h">client_handler.h</A>
shows a few more changes than the previous sources.&nbsp; The important
change is the addition of a svc() method where our connection thread will
exist.
X
<P>
<HR WIDTH="100%">
SHAR_EOF
  $shar_touch -am 03191459100 'page04.pre' &&
  chmod 0664 'page04.pre' ||
  $echo 'restore of' 'page04.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 \
    || $echo 'page04.pre:' 'MD5 check failed'
8256aff03563fbc281403fc5bb970e69  page04.pre
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page04.pre'`"
    test 227 -eq "$shar_count" ||
    $echo 'page04.pre:' 'original size' '227,' 'current size' "$shar_count!"
  fi
fi
# ============= page05.pre ==============
if test -f 'page05.pre' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page05.pre' '(file already exists)'
else
  $echo 'x -' extracting 'page05.pre' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page05.pre' &&
<P><A HREF="client_handler.cpp">client_handler.cpp</A> exposes all the
things I've been hinting at.&nbsp; Pay special attention to the decision
made in open() as well as the bit of cleverness in svc().
X
<P>
<HR WIDTH="100%">
SHAR_EOF
  $shar_touch -am 03191459100 'page05.pre' &&
  chmod 0664 'page05.pre' ||
  $echo 'restore of' 'page05.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 \
    || $echo 'page05.pre:' 'MD5 check failed'
fe144564cd75e806b825ce878a09bfe3  page05.pre
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page05.pre'`"
    test 225 -eq "$shar_count" ||
    $echo 'page05.pre:' 'original size' '225,' 'current size' "$shar_count!"
  fi
fi
# ============= page06.pre ==============
if test -f 'page06.pre' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page06.pre' '(file already exists)'
else
  $echo 'x -' extracting 'page06.pre' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page06.pre' &&
<P>That's it for Tutorial 6.&nbsp; With very little effort we've managed
to extend the previous single-threaded server to an implementation which
allows runtime selection of single or multi-threaded operation.&nbsp; In
Tutorial 7 we'll extend that again to allow a thread-pool choice in addition
to the current two.
X
<P>For reference, here's the file list again:
<UL>
<LI>
<A HREF="Makefile">Makefile</A></LI>
X
<LI>
<A HREF="client_acceptor.h">client_acceptor.h</A></LI>
X
<LI>
<A HREF="client_handler.cpp">client_handler.cpp</A></LI>
X
<LI>
<A HREF="client_handler.h">client_handler.h</A></LI>
X
<LI>
<A HREF="server.cpp">server.cpp</A></LI>
X
<LI>
<A HREF="fix.Makefile">fix.Makefile</A></LI>
</UL>
SHAR_EOF
  $shar_touch -am 03191459100 'page06.pre' &&
  chmod 0664 'page06.pre' ||
  $echo 'restore of' 'page06.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 \
    || $echo 'page06.pre:' 'MD5 check failed'
0adca372a5154acf673cc373d2acaf5a  page06.pre
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page06.pre'`"
    test 697 -eq "$shar_count" ||
    $echo 'page06.pre:' 'original size' '697,' 'current size' "$shar_count!"
  fi
fi
# ============= page02.pst ==============
if test -f 'page02.pst' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page02.pst' '(file already exists)'
else
  $echo 'x -' extracting 'page02.pst' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page02.pst' &&
<HR WIDTH="100%">
X
<P>Let's move along and see what happend to the Client_Acceptor.
X
<P>
SHAR_EOF
  $shar_touch -am 03191459100 'page02.pst' &&
  chmod 0664 'page02.pst' ||
  $echo 'restore of' 'page02.pst' '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 \
    || $echo 'page02.pst:' 'MD5 check failed'
0188a5ff7cacc123676e420ac5432207  page02.pst
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page02.pst'`"
    test 89 -eq "$shar_count" ||
    $echo 'page02.pst:' 'original size' '89,' 'current size' "$shar_count!"
  fi
fi
# ============= page03.pst ==============
if test -f 'page03.pst' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page03.pst' '(file already exists)'
else
  $echo 'x -' extracting 'page03.pst' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page03.pst' &&
<HR WIDTH="100%">
X
<P>Ok, so far we haven't done much to change our concurrency strategy.&nbsp;
Let's move on to the Client_Handler and see if it has changed any.
X
<P>
SHAR_EOF
  $shar_touch -am 03191459100 'page03.pst' &&
  chmod 0664 'page03.pst' ||
  $echo 'restore of' 'page03.pst' '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 \
    || $echo 'page03.pst:' 'MD5 check failed'
7743577254d06f5848b5e50f3b6c3014  page03.pst
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page03.pst'`"
    test 168 -eq "$shar_count" ||
    $echo 'page03.pst:' 'original size' '168,' 'current size' "$shar_count!"
  fi
fi
# ============= page04.pst ==============
if test -f 'page04.pst' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page04.pst' '(file already exists)'
else
  $echo 'x -' extracting 'page04.pst' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page04.pst' &&
<HR WIDTH="100%">
X
<P>So... we've added a svc() method and alluded to changes in open().&nbsp;
Let's move on to the object definition and see what all the fuss is about.
X
<P>
SHAR_EOF
  $shar_touch -am 03191459100 'page04.pst' &&
  chmod 0664 'page04.pst' ||
  $echo 'restore of' 'page04.pst' '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 \
    || $echo 'page04.pst:' 'MD5 check failed'
dfe0897cc3f000b69c16c87dd1596281  page04.pst
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page04.pst'`"
    test 175 -eq "$shar_count" ||
    $echo 'page04.pst:' 'original size' '175,' 'current size' "$shar_count!"
  fi
fi
# ============= page05.pst ==============
if test -f 'page05.pst' && test "$first_param" != -c; then
  $echo 'x -' SKIPPING 'page05.pst' '(file already exists)'
else
  $echo 'x -' extracting 'page05.pst' '(text)'
  sed 's/^X//' << 'SHAR_EOF' > 'page05.pst' &&
<HR WIDTH="100%">
<P>
X      Did you notice the <i>THR_DETACHED</i> flag on the call to
X      <i>activate()</i>?  Threads, like any system resource, are a
X      limited resource.  Unless we intend to <i>join()</i> or
X      <i>wait()</i> for the new thread later, we want use THR_DETACHED
X      so that we don't cause a leak.  In fact, in most cases, you'll
X      want to specify THR_DETACHED because it's just easier.
<p>
X      Another handy flag for use with <i>activate()</i> is
X      <i>THR_NEW_LWP</i>.  That's short for <i>Light Weight
X  Process</i>.  If you've got a multiprocessor, this flag will
X      allocate a new schedulable process and decrease the odds of your
X      threads all fighting for the same process.  Of course, if you
X      have a uni-processor, it will neither help nor hurt.  Since I
X      developed these on a uni-processor, I've been a bit inconsistent
X      in the use of <i>THR_NEW_LWP</i>.
X
<P>Well, that's it!&nbsp; After all the talk &amp; the hype, you would
have expected it to be more difficult to create a multi-threaded server.&nbsp;
Surprise!&nbsp; It really is that easy.&nbsp; You still have to handle
contention issues which we haven't addressed here and that is a rather
nasty topic.&nbsp; Still, for the simple case, this is all you have to
do.
X
<P>The next page is the last for this tutorial.&nbsp; Head on over there
&amp; we'll round up the file list one last time.
X
<P>
SHAR_EOF
  $shar_touch -am 03191459100 'page05.pst' &&
  chmod 0664 'page05.pst' ||
  $echo 'restore of' 'page05.pst' '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 \
    || $echo 'page05.pst:' 'MD5 check failed'
0589bdf4e09c3c1671f64fd98e8e7747  page05.pst
SHAR_EOF
  else
    shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page05.pst'`"
    test 1418 -eq "$shar_count" ||
    $echo 'page05.pst:' 'original size' '1418,' 'current size' "$shar_count!"
  fi
fi
rm -fr _sh32413
exit 0