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Moniteurs, Java, Threads et Processus - Montefiore

Moniteurs, Java, Threads et Processus - Montefiore

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public synchronized void append(Object data)<br />

{ if (count == N) notfull.qWait();<br />

buffer[in] = data;<br />

in = (in + 1) % N; count++;<br />

notempty.qSignal();<br />

}<br />

public synchronized Object take()<br />

{ Object data;<br />

}<br />

}<br />

if (count == O) notempty.qWait();<br />

data = buffer[out];<br />

out = (out + 1) % N;<br />

count--; notfull.qSignal();<br />

r<strong>et</strong>urn data;<br />

L’opération qSignal n’a pas d’eff<strong>et</strong> si la file est vide <strong>et</strong> donc c<strong>et</strong>te solution<br />

ne souffre pas du problème de double signalisation rencontré dans le cadre<br />

de l’utilisation des sémaphores binaires.<br />

11

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