Concurrency en race condities
Concurrency en race condities
Concurrency en race condities
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Afscherming voor N tak<strong>en</strong> met arbiter<br />
(Luuk Gro<strong>en</strong>eweg<strong>en</strong>)<br />
<strong>en</strong>um KRITIEK {erin, eruit} IkWil[Nproc], JeMag[Nproc];<br />
Cli<strong>en</strong>t(int N)<br />
{ while(1)<br />
{ /* Niet kritiek */<br />
IkWil[N] = erin;<br />
wachtop(JeMag[N] == erin);<br />
/* kritiek */<br />
IkWil[N] = eruit;<br />
wachtop(JeMag[N] ==<br />
eruit);<br />
}<br />
}<br />
Arbiter()<br />
{ i = 0;<br />
while(1)<br />
{<br />
if (IkWil[i] == erin)<br />
{ JeMag[i] = erin;<br />
wachtop(IkWil[i] ==<br />
eruit);<br />
JeMag[i] = eruit;<br />
}<br />
i = (i + 1) % Nproc;<br />
}<br />
}<br />
College OS 2010 – 2011 14
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