XI Workshop de Testes e Tolerância a Falhas (WTF) - SBRC 2010
XI Workshop de Testes e Tolerância a Falhas (WTF) - SBRC 2010
XI Workshop de Testes e Tolerância a Falhas (WTF) - SBRC 2010
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<strong>XI</strong> <strong>Workshop</strong> <strong>de</strong> <strong>Testes</strong> e Tolerância a <strong>Falhas</strong> 23<br />
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/* D: Detection set */<br />
/* F: Faulty set */<br />
Initialisation ()<br />
count ← 0<br />
F ← { }<br />
case i = 0<br />
token ← REAL<br />
D ← {S 0 }<br />
case 0 < i ≤ k<br />
token ← BACKUP<br />
D ← {S 0 , .., S i }<br />
case k < i<br />
token ← NONE<br />
D ← { }<br />
UpdateDetection(D)<br />
SafeSendToken (〈TOKEN〉)<br />
to S i+1<br />
count ← count + 1<br />
Send 〈TOKEN,S i+1 ,count 〉<br />
to {S i+1 , .., S i+k+1 }<br />
token ← NONE<br />
D ← { }<br />
UpdateDetection(D)<br />
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SafeReceiveToken (〈TOKEN,S t ,count r 〉) from S j<br />
if count < count r then<br />
count ← count r<br />
D ← {S t , .., S i }<br />
if S i = S t then<br />
token ← REAL<br />
DeliverToken(〈TOKEN〉)<br />
else if D/F = {S i } then<br />
UseBackup()<br />
else<br />
token ← BACKUP<br />
updateDetection(D)<br />
ReceiveSuspected (S j )<br />
F ← F ∪ S j<br />
if D/F = {S i } then<br />
UseBackup()<br />
UseBackup ()<br />
count ← count + ( #(D) - 1 )<br />
token ← REAL<br />
UpdateToken(〈TOKEN〉)<br />
DeliverToken(〈TOKEN〉)<br />
Figura 2. Algoritmo tolerante à perda do token
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