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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>5.1 Timers</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Web Server:<span class="mywbr"> </span> HTTP Server</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="dispatch-server-unit.html" class="tocviewlink" data-pltdoc="x">Dispatching Server</a></td></tr><tr><td align="right">2 </td><td><a href="dispatchers.html" class="tocviewlink" data-pltdoc="x">Dispatchers</a></td></tr><tr><td align="right">3 </td><td><a href="web-server.html" class="tocviewlink" data-pltdoc="x">Launching Servers</a></td></tr><tr><td align="right">4 </td><td><a href="Web_Servers.html" class="tocviewlink" data-pltdoc="x">Web Servers</a></td></tr><tr><td align="right">5 </td><td><a href="private.html" class="tocviewselflink" data-pltdoc="x">Internal APIs</a></td></tr><tr><td align="right">6 </td><td><a href="Troubleshooting_and_Tips.html" class="tocviewlink" data-pltdoc="x">Troubleshooting and Tips</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>5 </td><td><a href="private.html" class="tocviewlink" data-pltdoc="x">Internal APIs</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">5.1 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Timers</a></td></tr><tr><td align="right">5.2 </td><td><a href="connection-manager.html" class="tocviewlink" data-pltdoc="x">Connection Manager</a></td></tr><tr><td align="right">5.3 </td><td><a href="closure.html" class="tocviewlink" data-pltdoc="x">Serializable Closures</a></td></tr><tr><td align="right">5.4 </td><td><a href="cache-table.html" class="tocviewlink" data-pltdoc="x">Cache Table</a></td></tr><tr><td align="right">5.5 </td><td><a href="mime-types.html" class="tocviewlink" data-pltdoc="x">MIME Types</a></td></tr><tr><td align="right">5.6 </td><td><a href="mod-map.html" class="tocviewlink" data-pltdoc="x">Serialization Utilities</a></td></tr><tr><td align="right">5.7 </td><td><a href="url-param.html" class="tocviewlink" data-pltdoc="x">URL Param</a></td></tr><tr><td align="right">5.8 </td><td><a href="gzip.html" class="tocviewlink" data-pltdoc="x">GZip</a></td></tr><tr><td align="right">5.9 </td><td><a href="misc-util.html" class="tocviewlink" data-pltdoc="x">Miscellaneous Utilities</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer-manager~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">timer-<wbr></wbr>manager?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">timer</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._start-timer-manager%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">start-<wbr></wbr>timer-<wbr></wbr>manager</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._start-timer%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">start-<wbr></wbr>timer</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._reset-timer%21%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">reset-<wbr></wbr>timer!</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._increment-timer%21%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">increment-<wbr></wbr>timer!</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._cancel-timer%21%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">cancel-<wbr></wbr>timer!</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="private.html" title="backward to "5 Internal APIs"" data-pltdoc="x">← prev</a> <a href="private.html" title="up to "5 Internal APIs"" data-pltdoc="x">up</a> <a href="connection-manager.html" title="forward to "5.2 Connection Manager"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "web-server/scribblings/web-server-internal.scrbl")" x-part-tag=""timer"">5.1<tt> </tt><a name="(part._timer)"></a><a name="(mod-path._web-server/private/timer)"></a>Timers</h4><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left" colspan="2"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">web-server/private/timer</span></a><span class="RktPn">)</span></td></tr><tr><td align="left"> </td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">web-server-lib</span></span></td></tr></table></div><div class="SIntrapara">This module provides a functionality for running
procedures after a given amount of time, that may be extended.</div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._timer-manager~3f))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer-manager~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">timer-manager?</a></span></span><span class="hspace"> </span><span class="RktVar">x</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=booleans.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._boolean%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">x</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Determines if <span class="RktVar">x</span> is a timer manager.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>struct</p></div></div><table cellspacing="0" cellpadding="0" class="RForeground"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define-struct.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._struct%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">struct</a></span></td><td><span class="hspace"> </span></td><td><a name="(def._((lib._web-server/private/timer..rkt)._timer-action))"></a><a name="(def._((lib._web-server/private/timer..rkt)._timer-expire-seconds))"></a><a name="(def._((lib._web-server/private/timer..rkt)._timer-evt))"></a><a name="(def._((lib._web-server/private/timer..rkt)._timer-tm))"></a><a name="(def._((lib._web-server/private/timer..rkt)._make-timer))"></a><a name="(def._((lib._web-server/private/timer..rkt)._timer~3f))"></a><a name="(def._((lib._web-server/private/timer..rkt)._struct~3atimer))"></a><a name="(def._((lib._web-server/private/timer..rkt)._timer))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer%29%29" class="RktValDef RktValLink" data-pltdoc="x">timer</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">tm</span><span class="stt"> </span><span class="RktSym">evt</span><span class="stt"> </span><span class="RktSym">expire-seconds</span><span class="stt"> </span><span class="RktSym">action</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">#:extra-constructor-name</span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._make-timer%29%29" class="RktValLink" data-pltdoc="x">make-timer</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">tm</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer-manager~3f%29%29" class="RktValLink" data-pltdoc="x">timer-manager?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">evt</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=sync.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._evt%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">evt?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">expire-seconds</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._number%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">number?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">action</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=function-contracts.html%23%2528form._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._-%7E3e%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x"><span class="nobreak">-></span></a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void</a></span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara"><span class="RktSym">evt</span> is an <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=sync.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._alarm-evt%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">alarm-evt</a></span> that is ready at <span class="RktSym">expire-seconds</span>.
<span class="RktSym">action</span> should be called when this <span class="RktSym">evt</span> is ready.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._start-timer-manager))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._start-timer-manager%29%29" class="RktValDef RktValLink" data-pltdoc="x">start-timer-manager</a></span></span><span class="RktPn"></span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer-manager~3f%29%29" class="RktValLink" data-pltdoc="x">timer-manager?</a></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Handles the execution and management of timers.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._start-timer))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._start-timer%29%29" class="RktValDef RktValLink" data-pltdoc="x">start-timer</a></span></span><span class="hspace"> </span><span class="RktVar">tm</span><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span><span class="RktVar">action</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer~3f%29%29" class="RktValLink" data-pltdoc="x">timer?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">tm</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer-manager~3f%29%29" class="RktValLink" data-pltdoc="x">timer-manager?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._number%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">number?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">action</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=function-contracts.html%23%2528form._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._-%7E3e%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x"><span class="nobreak">-></span></a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void</a></span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Registers a timer that runs <span class="RktVar">action</span> after <span class="RktVar">s</span> seconds.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._reset-timer!))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._reset-timer%21%29%29" class="RktValDef RktValLink" data-pltdoc="x">reset-timer!</a></span></span><span class="hspace"> </span><span class="RktVar">t</span><span class="hspace"> </span><span class="RktVar">s</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">t</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer~3f%29%29" class="RktValLink" data-pltdoc="x">timer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._number%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">number?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Changes <span class="RktVar">t</span> so that it will fire after <span class="RktVar">s</span> seconds.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._increment-timer!))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._increment-timer%21%29%29" class="RktValDef RktValLink" data-pltdoc="x">increment-timer!</a></span></span><span class="hspace"> </span><span class="RktVar">t</span><span class="hspace"> </span><span class="RktVar">s</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">t</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer~3f%29%29" class="RktValLink" data-pltdoc="x">timer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._number%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">number?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Changes <span class="RktVar">t</span> so that it will fire after <span class="RktVar">s</span> seconds from when
it does now.</div></p></div><div class="SIntrapara"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/private/timer..rkt)._cancel-timer!))"></a><span title="Provided from: web-server/private/timer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._cancel-timer%21%29%29" class="RktValDef RktValLink" data-pltdoc="x">cancel-timer!</a></span></span><span class="hspace"> </span><span class="RktVar">t</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">t</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Ftimer..rkt%29._timer~3f%29%29" class="RktValLink" data-pltdoc="x">timer?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Cancels the firing of <span class="RktVar">t</span> ever and frees resources used by <span class="RktVar">t</span>.</div></p></div></p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="private.html" title="backward to "5 Internal APIs"" data-pltdoc="x">← prev</a> <a href="private.html" title="up to "5 Internal APIs"" data-pltdoc="x">up</a> <a href="connection-manager.html" title="forward to "5.2 Connection Manager"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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