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<div class="chlinktop"><span class="chlink1">Goto Chapter: </span><a href="chap0.html">Top</a>  <a href="chap1.html">1</a>  <a href="chap2.html">2</a>  <a href="chap3.html">3</a>  <a href="chap4.html">4</a>  <a href="chap5.html">5</a>  <a href="chap6.html">6</a>  <a href="chap7.html">7</a>  <a href="chap8.html">8<

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<p id="mathjaxlink" class="pcenter"><a <span
<p><aid name""></a<pjava.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap9.html#X7866F9DA8358968C">9.2-5 ShutdownServingSocket</a></span>
< class>br> class>; =.9-<a</>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap9.html#X7BE1B9FD82C9B8E0">9.2-7 AcceptNewConnection</a></span>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap9.html#X79031BC687502CB6">9.2-10 NewTCPConnection</a></span
 ="br< =nocss">;&;<s><a=".X7F8C7F5782213A71>.21
<span one to inputoutput  than connection descriptor attimesome is  organise / .Due  single-threaded of current  class"GAP (chap3htmlX81CA6EE88062010E< class">.2-5 and some and queueing organise this. This chapter describes genericimplementationof Ichap9"">.-) objects. The basic idea is that an func"IOHub/ode>(a=chap9html#>span ="">.21/>spanRefLink921/>/,   theofconnection  .   amessage  ,    itfor     outputThe< =">(ahref=c#"< =RefLink.-13s>a) whenoftenwill sure message  .p>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap9.html#X810D418A802D09D1">9.2-13 DoIO</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap9.html#X7A489A5D79DA9E5C">9.3 <span class="Heading"> Examples </span></a>
</span>
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</div>

<h3>9 <span class="Heading">I/O multiplexing</span></h3>

<p><a id="X7DFB63A97E67C0A1" name="X7DFB63A97E67C0A1"></a></p>

<h4>9.1 <span class="Heading">Introduction</span></h4>

<p>Whenever one needs to do input/output on more than one connection (file descriptor) at a timesome code is needed to organise the I/O multiplexing. Due to the single-threaded nature of the current <strong class="java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p

<h492< classHeading operations <code=""IOHubcode </spanh4>

<p>In <>9.- </h5

<p><a id classfunc< class"width"0"tr< class="tdleft">>&27;</code()</> class"tdright">;operationnbsp;/></tr</></>

<h5>9.2-1 IOHub</h5>

<div class="func"><table class="func" width="100%"><tr><td class="
<p>Returns: an <code class="func">IOHub</codeobject</p>

<p>This creates a new <code class="java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id="X7D1D9A8D837ECCEB" name="X7D1D9A8D837ECCEB"></a></p>

<h5>9.2-2 NewConnectionpReturnsa integer/>

<div="func">< classfunc="10%"<tr">">RNewConnection(Arg><varvarArg/>, < ""><> <t>td"">(&;operation;)</><trtable/>
<p>Returns: a positive integer</p>

<p>This operation adds <>Fromthe moment these descriptors are with thecode class"func">IOHub/ode> (<a hrefchap9htmlX83C0523D8538E866<spanclass"efLink">9.-/></>) object subsequent to code class""DoIO> < href=".html#X810D418A802D09D1"><span="RefLink">9-</><a>)will to do inputand onthem. This means particular that the side thisconnection should be the same initialstate theprotocol thiswill beachieved bythem beingadded  a  connection toa corresponding class"unc">OHub/ode (ahrefchap9#"92-1<>
)object other side at thesame ./java.lang.StringIndexOutOfBoundsException: Index 728 out of bounds for length 728


e <code=""></code (<a href"chap9html#"><spanclass=RefLink>9-1</span><aobject,every call to<code classfunc</code> (<a =".html#X810D418A802D09D1">span="RefLink">.-</span>/>)will to input  output .This means particular  other side of connection  be in  sameinitial  ofthe. Usually  will achieved them added a  connectionto   <codeclass""></> (<a href=chap9html">spanclass""92-1/) theother side at same time

<p>See also <code class="func">NewTCPConnection</code> (<a href="chap9.html#X79031BC687502CB6"><span class="RefLink">9.2-10</span></a>) below.</p>

<p><a id="X8553D2E47C05797F" name="X8553D2E47C05797F"></a></p>

<h5>9.2-3 CloseConnection</h5>

<div class="func"><table class="func" width="10java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<>: </p>

<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object and <var class="Arg">nr</var> the number of a connection which was previously returned by <code class="func">NewConnection</code> (<a href="chap9.html#X7D1D9A8D837ECCEB"><span class="RefLink"><>Returns   file descriptoror <code class"keyw">fail<code/>

<p><a id="X7F7FD824866CB582" name="X7F7FD824866CB582"></a></p>

<h5>9.2-4 AttachServingSocket</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ AttachServingSocket</code>( <var class="Arg">h</var>, <var class="Arg">addr</var>, <var class="Arg">port</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: a Unix file descriptor or <code class="keyw">fail</code></p>

<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object, <var class="Arg">addr</var> an IP address or host name as a string and <var class="Arg">port</var> a port number (see also <code class="func">IO_MakeIPAddressPort</code> (<a href="chap4.html#X8568CE6684C90CE5"><span class="RefLink">4.3-6</span></a>)). This operation creates a new socket, binds it to the IP address and port and attaches it to the <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id="X7866F9DA8358968C" name="X7866F9DA8358968C"></a></p>

<h5>9.2-5 ShutdownServingSocket</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ ShutdownServingSocket</code>( <var class="Arg">h</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<Returnsnothing/p>

<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object. Any server socket which was attached to <var class="Arg">h</var> is shut down, so no new connections will be accepted.</p>

<p><a id="X84AFBD658118ABB8" name="X84AFBD658118ABB8"></a></p>

<h5>9.2-6 Shutdown</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ Shutdown</code>( <var class="Arg">h</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: nothing

<p> class< class""width0"<>>&82;</>(< classArgvar<td< class>&;operation&;)</></></table/>

<p><a id="X7BE1B9FD82C9B8E0" name="X7BE1B9FD82C9B8E0"></a></p>

<h5>9.2-7 AcceptNewConnection</h5>

<div class="func"><table class="func" width="100%"><tr><tdR: a   or class></><java.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68
pReturnsa positive integerorcode class="">fail/></>

<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object. The object <var class="Arg">h</var> must have a serving socketjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id="X85F634D4826D89F1" name="X85F634D4826D89F1"></a></p>

<h5>9.2-8 SubmitOutput</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ SubmitOutput</code>( <var class="Arg">h</var>, <var class="Arg">nr</var>, <var class="Arg">st</var> )</td><td class="tdright">( operation )</td></tr></table></div>


<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object, <var class="Arg">nr</varmust be a positive integer which is the number of an open connection of <var class="Arg">h</var> which can be used for output. The argument <var class="Arg">st</var> must be a <strong class="pkg">GAP</strong> string. This operation appends the message <var class="Arg">st</var> to the end of the output queue for the connection <var class="Arg">nr</var>. Note that at this stage no output is actually performed automatically. One has to call <code class="func">DoIO</code> (<a href="chap9.html#X810D418A802D09D1"><span class="RefLink">9.2-13</span></a>) subsequently to actually send the message away.</p>

<p><a id="X837629707DF9B60E" name="X837629707DF9B60E"></a></p>

<h5>9.2-9 GetInput</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ GetInput</code>( <var class="Arg">h</var>, <var class="Arg">nr</var> )</td><td class="tdright">( operation )</td></tr></table></div>
<p>Returns: a list of length <span class="SimpleMath">2</span></p>

<p>The argument <var class="Arg">h</var> must be an <code class="func">IOHub</code> (<a href="chap9.html#X83C0523D8538E866"><span class="RefLink">9.2-1</span></a>) object, <var class="Arg">nr</varmust be an integer. If <var class="Arg">nr</var> is positive, this operation returns the earliest message which has come java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p><a id="X79031BC687502CB6" name="X79031BC687502CB6"></a></p>

<h5>9.2-10 NewTCPConnection</h5>

<div class="func"><table class="func" widthp>: a  number < class></>/>
:  number=""<>>

<p>The argument <var class="Arg">h</var> must

<p><a id="X7F8C7F5782213A71" name="X7F8C7F5782213A71"></a></p>

<h592-1 </h5

<divclassfunc<table="func ="0"">< ="func"&827 OutputQueue> < =Arg<var<td=">&;operation )/>
pReturns a list

<p argumentvar=Arg<varmust an="func"><code(< href.html">< class="">92- . This returns the internal object for output . Itselements pairs where the first entry is connection numberwhere is going to be sent and the second entry is message as a string Only modify thislistif really knowwhat are doing

<

<pReturns </p>

<div class="func"><pThe <var="Arg">h/armust <func<c>(a href.htmlX83C0523D8538E866span=RefLink.-<span</a>) object. This theobject   . Itspairs entry   the and  ismessagea .Only   ifreally youdoingp
<p>Returns: a list</p>

<p>The argument <var class="Arg">h</var class"" width=10"<>tdtdleft class">&82; DoIO
( < class="
Arg></var[<var=Argblockvar )/tdtdclass">( operation )t>/>

java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<h5>9p> ="" ="X7A489A5D79DA9E5C"</a<p>

< class> classfunc="00%"tr=tdleft< =func87>( <var="hvar>["> >( operationnbsp<td</tr></></div
<p>Returns: <code class="keyw">true</code> or <code class="keyw">false</code> or <code class="keyw">fail</code></p>

<p>The argument <var class="Arg">h</var> must bejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

<p>Note that broken connections are silently closed.</p>

<p><a id="X7A489A5D79DA9E5C" name="X7A489A5D79DA9E5C"></a></p>

<h4>9.3 <span class="Heading"> Examples </span></h4>

<p>There is an example hash server in the file <code class="file">examples/hashserver.g</code


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