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Marco Realacci 2025-04-05 00:07:51 +02:00
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6
Concurrent Systems/notes/2 - Fast mutex by Lamport.md
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@ -49,9 +49,9 @@ unlock(i) :=
##### MUTEX proof
How can pi enter its CS?
![](Concurrent%20Systems/notes/images/Pasted%20image%2020250304084537.png)
![](images/Pasted%20image%2020250304084537.png)
![](Concurrent%20Systems/notes/images/Pasted%20image%2020250304084901.png)
![](images/Pasted%20image%2020250304084901.png)
(*must finished before nel senso che $p_i$ deve aspettare $p_j$*)
##### Deadlock freedom
Let $p_i$ invoke lock
@ -72,6 +72,6 @@ Let $p_i$ invoke lock
- In the second wait Y = ⊥: but then there exists a $p_h$ that eventually enters its CS -> good
- In the ∀j.wait FLAG[j]=down: this wait cannot block a process forever
![](Concurrent%20Systems/notes/images/Pasted%20image%2020250304090219.png)
![](images/Pasted%20image%2020250304090219.png)
esercizio: prova che NON soddisfa starvation freedom