
Semafori binari e di Dijkstra
Authored by Emanuela Giaconi
Computers
11th Grade
Used 8+ times

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16 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
In un semaforo binario a seconda del valore di x abbiamo
x=1 risorsa libera
x=0 risorsa libera
x=1 risorsa occupata
x=0 risorsa occupata
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
L'istruzione TestAndSet(x):
Modifica il valore di un bit in modo ininterrompibile
Modifica il valore di un byte in modo ininterrompibile
Modifica il valore di x in modo ininterrompibile
Tutte le affermazioni precedenti sono valide, dipende dall'applicazione
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
L'istruzione TestAndSet(x)
risolve il problema dell'attesa attiva
risolve il problema della starvation
risolve il problema dell'interleaving
non risolve nessun problema
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Se la mancanza di sincronizzazione provoca danni trascurabili, la miglior strategia è ignorare il problema
Vero
Falso
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
La serializzazione può essere ottenuta introducendo cicli di ritardo
Vero
Falso
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
L'istruzione di lock su uno spin può generare una situazione di attesa attiva
Vero
Falso
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Per evitare situazioni di interleaving l'istruzione di lock si esegue a interruzioni disabilitate
Vero
Falso
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