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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>11.2 Synchronization</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="extras.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="../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="../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"><span style="font-weight: bold">The Racket Reference</span></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="model.html" class="tocviewlink" data-pltdoc="x">Language Model</a></td></tr><tr><td align="right">2 </td><td><a href="notation.html" class="tocviewlink" data-pltdoc="x">Notation for Documentation</a></td></tr><tr><td align="right">3 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntactic Forms</a></td></tr><tr><td align="right">4 </td><td><a href="data.html" class="tocviewlink" data-pltdoc="x">Datatypes</a></td></tr><tr><td align="right">5 </td><td><a href="structures.html" class="tocviewlink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">6 </td><td><a href="mzlib_class.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">7 </td><td><a href="mzlib_unit.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">8 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">9 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Control Flow</a></td></tr><tr><td align="right">11 </td><td><a href="concurrency.html" class="tocviewselflink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr><tr><td align="right">12 </td><td><a href="Macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">13 </td><td><a href="input-and-output.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">14 </td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Reflection and Security</a></td></tr><tr><td align="right">15 </td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr><tr><td align="right">16 </td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x">Memory Management</a></td></tr><tr><td align="right">17 </td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Operations</a></td></tr><tr><td align="right">18 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</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>11 </td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr></table><div class="tocviewsublist" style="display: none;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">11.1 </td><td><a href="threads.html" class="tocviewlink" data-pltdoc="x">Threads</a></td></tr><tr><td align="right">11.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Synchronization</a></td></tr><tr><td align="right">11.3 </td><td><a href="thread-local-storage.html" class="tocviewlink" data-pltdoc="x">Thread-<wbr></wbr>Local Storage</a></td></tr><tr><td align="right">11.4 </td><td><a href="futures.html" class="tocviewlink" data-pltdoc="x">Futures</a></td></tr><tr><td align="right">11.5 </td><td><a href="places.html" class="tocviewlink" data-pltdoc="x">Places</a></td></tr><tr><td align="right">11.6 </td><td><a href="engine.html" class="tocviewlink" data-pltdoc="x">Engines</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_2");">▼</a></td><td>11.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Synchronization</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_2"><table cellspacing="0" cellpadding="0"><tr><td align="right">11.2.1 </td><td><a href="sync.html" class="tocviewlink" data-pltdoc="x">Events</a></td></tr><tr><td align="right">11.2.2 </td><td><a href="channel.html" class="tocviewlink" data-pltdoc="x">Channels</a></td></tr><tr><td align="right">11.2.3 </td><td><a href="semaphore.html" class="tocviewlink" data-pltdoc="x">Semaphores</a></td></tr><tr><td align="right">11.2.4 </td><td><a href="async-channel.html" class="tocviewlink" data-pltdoc="x">Buffered Asynchronous Channels</a></td></tr></table></div></div></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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="threads.html" title="backward to "11.1 Threads"" data-pltdoc="x">← prev</a> <a href="concurrency.html" title="up to "11 Concurrency and Parallelism"" data-pltdoc="x">up</a> <a href="sync.html" title="forward to "11.2.1 Events"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-source-pkg="racket-doc" x-part-tag=""all-sync"">11.2<tt> </tt><a name="(part._all-sync)"></a>Synchronization</h4><p>Racket’s synchronization toolbox spans four layers:</p><ul><li><p><a href="sync.html#%28tech._synchronizable._event%29" class="techoutside" data-pltdoc="x"><span class="techinside">synchronizable events</span></a> —<wbr></wbr> a general framework for
synchronization;</p></li><li><p><a href="channel.html#%28tech._channel%29" class="techoutside" data-pltdoc="x"><span class="techinside">channels</span></a> —<wbr></wbr> a primitive that can be used, in principle,
to build most other kinds of synchronizable events (except the ones
that compose events); and</p></li><li><p><a href="semaphore.html#%28tech._semaphore%29" class="techoutside" data-pltdoc="x"><span class="techinside">semaphores</span></a> —<wbr></wbr> a simple and especially cheap primitive
for synchronization.</p></li><li><p><a href="futures.html#%28tech._future._semaphore%29" class="techoutside" data-pltdoc="x"><span class="techinside">future semaphores</span></a> —<wbr></wbr> a simple synchronization primitive
for use with <a href="futures.html#%28tech._future%29" class="techoutside" data-pltdoc="x"><span class="techinside">futures</span></a>.</p></li></ul><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="sync.html" class="toclink" data-pltdoc="x">11.2.1<span class="hspace"> </span>Events</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="channel.html" class="toclink" data-pltdoc="x">11.2.2<span class="hspace"> </span>Channels</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="semaphore.html" class="toclink" data-pltdoc="x">11.2.3<span class="hspace"> </span>Semaphores</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="async-channel.html" class="toclink" data-pltdoc="x">11.2.4<span class="hspace"> </span>Buffered Asynchronous Channels</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="async-channel.html#%28part._.Creating_and_.Using_.Asynchronous_.Channels%29" class="toclink" data-pltdoc="x">11.2.4.1<span class="hspace"> </span>Creating and Using Asynchronous Channels</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="async-channel.html#%28part._.Contracts_and_.Impersonators_on_.Asynchronous_.Channels%29" class="toclink" data-pltdoc="x">11.2.4.2<span class="hspace"> </span>Contracts and Impersonators on Asynchronous Channels</a></p></td></tr></table><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, "6.7", "../");" 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("6.7");">top</a></span><span class="navright"> <a href="threads.html" title="backward to "11.1 Threads"" data-pltdoc="x">← prev</a> <a href="concurrency.html" title="up to "11 Concurrency and Parallelism"" data-pltdoc="x">up</a> <a href="sync.html" title="forward to "11.2.1 Events"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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