<?xml version="1.0"?>
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   <channel>
      <title>PROGRAMMAZIONE CONCORRENTE 2 by Chiara Viganò</title>
      <link>https://padlet.com/maxandsmusmi/lezione2</link>
      <description>Realizzato con molta voglia</description>
      <language>en-us</language>
      <pubDate>2017-02-12 16:32:41 UTC</pubDate>
      <lastBuildDate>2023-01-19 16:21:46 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
      <image>
         <url>https://padlet-assets.s3.amazonaws.com/icons/Rocket.png</url>
      </image>
      <item>
         <title>LA DESCRIZIONE DELLA CONCORRENZA (Lezione 2)</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153283672</link>
         <description><![CDATA[]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 16:37:12 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153283672</guid>
      </item>
      <item>
         <title>Cosa impareremo:</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153285908</link>
         <description><![CDATA[<div>- l'istruzione fork-join<br>- l'istruzione cobegin-coend</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 17:07:30 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153285908</guid>
      </item>
      <item>
         <title>Esecuzione parallela</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153285991</link>
         <description><![CDATA[<div>L’esecuzione di un processo non sequenziale richiede un sistema specifico che permetta la codifica e l’esecuzione dei programmi, cioè necessita di:</div><ul><li>un elaboratore non sequenziale</li><li>un linguaggio di programmazione non sequenziale</li></ul>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 17:08:43 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153285991</guid>
      </item>
      <item>
         <title>Elaboratore non sequenziale</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153286074</link>
         <description><![CDATA[<div>L’elaboratore non sequenziale è una macchina che deve essere in grado di eseguire più operazioni contemporaneamente si può ottenere in due modi differenti:</div><ul><li>architettura parallela, cioè sistemi multielaboratori</li><li>sistemi monoprocessori multiprogrammati</li></ul>]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/fdc3499f4d25c71cb6e25196886338bb/Immagine1.png" />
         <pubDate>2017-02-12 17:10:00 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153286074</guid>
      </item>
      <item>
         <title>Linguaggi non sequenziali</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153286347</link>
         <description><![CDATA[<div>Per scrivere programmi non sequenziali (o concorrenti) è necessario avere a disposizione dei particolari costrutti che permettano la descrizione delle attività parallele. Non tutti i linguaggi hanno tali figure strutturali. Quelli che consentono la descrizione delle attività concorrenti prendono il nome di linguaggi di programmazione concorrente (o non sequenziale).<br><br>La scrittura di un programma concorrente si basa sul concetto di <strong>scomposizione sequenziale </strong>(un processo non sequenziale può essere scomposto in un insieme di processi sequenziali che possono essere eseguiti contemporaneamente)<br><br>I linguaggi di programmazione concorrenti di alto livello contemplano nuove istruzioni come il costrutto fork-join e cobegin-coend.<br>Permettono di dichiarare, creare, attivare e terminare processi sequenziali.</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 17:13:41 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153286347</guid>
      </item>
      <item>
         <title>END</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153286356</link>
         <description><![CDATA[]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 17:13:52 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153286356</guid>
      </item>
      <item>
         <title>Fork-join</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297339</link>
         <description><![CDATA[<div>Le istruzioni fork e join furono introdotte nel 1963 da Dennis e VanHorne. Permettono di descrivere l’esecuzione parallela di segmenti di codice mediante:</div><ul><li>la scomposizione di un processo in due processi</li><li>la successiva “riunione” in un unico processo</li></ul>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:40:57 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297339</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297471</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/9218c5575e1ea2ad0ca8ff3616759c09/file.png" />
         <pubDate>2017-02-12 19:42:35 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297471</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297533</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/f24323d4682dd786b6698b35e6213d75/file.png" />
         <pubDate>2017-02-12 19:43:27 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297533</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297598</link>
         <description><![CDATA[<div>Con un linguaggio di pseudocodifica è possibile tradurre il grafo nel seguente segmento di codice:</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:44:28 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297598</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297620</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 19:44:51 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297620</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297635</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 19:45:05 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297635</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297702</link>
         <description><![CDATA[<div>La join è l’istruzione che viene eseguita quando il processo creato tramite la fork:</div><ul><li>ha terminato il suo compito</li><li>si sincronizza con il processo che lo ha generato termina la sua esecuzione</li></ul>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:45:54 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297702</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297787</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/62e55034c0b236813befbbd92afc3258/file.png" />
         <pubDate>2017-02-12 19:47:04 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297787</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297801</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/01601ca6e75b67030078ce587368f52f/file.png" />
         <pubDate>2017-02-12 19:47:17 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297801</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297830</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/889cc3531a8038f23bedcdc1904f2b3d/file.png" />
         <pubDate>2017-02-12 19:47:40 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297830</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297851</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/195c69534ca3bab694b1bb3c1c516e39/file.png" />
         <pubDate>2017-02-12 19:48:08 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297851</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297910</link>
         <description><![CDATA[<div>Ipotizziamo che ogni nodo sia una <em>routine</em>: </div><ul><li>P1 esegue la routine A;</li><li>con la fork attiva il P2 e in parallelo si eseguono la routine B e la routine C</li><li>P1 attende con la join la terminazione di P2</li><li>P1esegue la routine C<br><br></li></ul>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:48:50 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297910</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153297940</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/e0fd9f91b6c13809dd408a786406b943/file.png" />
         <pubDate>2017-02-12 19:49:11 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153297940</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298201</link>
         <description><![CDATA[<div>Esiste anche una formulazione estesa dell’istruzione join</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:51:45 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298201</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298224</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/8726c7ac558912f38702f9b504f469e8/file.png" />
         <pubDate>2017-02-12 19:52:03 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298224</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298301</link>
         <description><![CDATA[<div><strong>count </strong>è una variabile intera non negativa e indica il numero di processi che si “riuniscono” in quel punto</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:52:56 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298301</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298338</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/4497b146d69c178b32080cc7353e3e68/file.png" />
         <pubDate>2017-02-12 19:53:27 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298338</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298435</link>
         <description><![CDATA[<div>Codifichiamo il diagramma precedente</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:54:41 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298435</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298582</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/f9e0fbf7ee6017f03e2ff50cf4e0b823/file.png" />
         <pubDate>2017-02-12 19:56:38 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298582</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298831</link>
         <description><![CDATA[<div>A volte viene anche messa una label per indicare dove il processo termina ed effettua la join, come nel seguente esempio</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 19:59:03 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298831</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298900</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 19:59:55 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298900</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153298912</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:00:09 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153298912</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299077</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:02:15 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299077</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299166</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:03:31 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299166</guid>
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      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299195</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:03:55 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299195</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299210</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:04:11 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299210</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299258</link>
         <description><![CDATA[<div>La sintassi del comando è</div>]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 20:04:51 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299258</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299267</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://padletuploads.blob.core.windows.net/prod/172102561/39f02ab0ab036ce9130685fd2992736b/file.png" />
         <pubDate>2017-02-12 20:04:58 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299267</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299295</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:05:19 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299295</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299314</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:05:33 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299314</guid>
      </item>
      <item>
         <title>Cobegin-coend</title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299485</link>
         <description><![CDATA[]]></description>
         <enclosure url="" />
         <pubDate>2017-02-12 20:07:42 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299485</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299778</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:11:18 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299778</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299799</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:11:29 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299799</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299855</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:11:59 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299855</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153299870</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:12:12 UTC</pubDate>
         <guid>https://padlet.com/maxandsmusmi/lezione2/wish/153299870</guid>
      </item>
      <item>
         <title></title>
         <author>maxandsmusmi</author>
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         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:12:43 UTC</pubDate>
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         <pubDate>2017-02-12 20:13:39 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153300009</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:13:52 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
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         <pubDate>2017-02-12 20:14:18 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153300088</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:14:53 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153300144</link>
         <description><![CDATA[<div>Questo grafo non presenta questa caratteristica e quindi costituisce un esempio impossibile da descrivere soltanto con cobegin e coend</div>]]></description>
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         <pubDate>2017-02-12 20:15:32 UTC</pubDate>
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         <title>Equivalenza di fork-join e cobegin-coend</title>
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         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153300332</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:17:58 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
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         <description><![CDATA[<div>La codifica con il costrutto fork-join è invece fattibile, ma è necessario introdurre le istruzioni di salto in quanto le fork si intersecano tra loro:</div>]]></description>
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         <pubDate>2017-02-12 20:18:50 UTC</pubDate>
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         <title>Semplificazione delle precedenze</title>
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         <description><![CDATA[<div>Prima di affrontare la scrittura di un programma parallelo è sempre necessario soffermarsi ad analizzare il grafo delle precedenze per cercare di semplificarlo eliminando le precedenze implicite</div><div>In presenza di precedenze implicite è possibile togliere un arco in quanto questo risulta ridondante ed è quindi possibile semplificare il grafo</div>]]></description>
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         <pubDate>2017-02-12 20:20:09 UTC</pubDate>
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         <title></title>
         <author>maxandsmusmi</author>
         <link>https://padlet.com/maxandsmusmi/lezione2/wish/153300733</link>
         <description><![CDATA[]]></description>
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         <pubDate>2017-02-12 20:23:19 UTC</pubDate>
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