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vault backup: 2025-03-17 21:47:45

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Marco Realacci 2025-03-17 21:47:45 +01:00
parent ef080f08af
commit 110db2ace3
2 changed files with 24 additions and 4 deletions
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22
Concurrent Systems/notes/5 - Software Transactional Memory.md
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@ -63,7 +63,27 @@ begin_T() :=
birthdate(T) <- CLOCK + 1
X.read_T() :=
if lc?(XX) !=
if lc?(XX) != ⊥ then
return lc(XX).val
lc(XX) <- XX
if lc(XX).date >= birthdate(T) then
ABORT
read_set(T) <- read_set(T) U {X}
return lc(XX).val
X.write_T(v) :=
if lc(XX) = ⊥ then
lc(XX) <- newloc
lc(XX).val <- v
write_set(T) <- write_set(T) U {X}
try_to_commit_T() :=
lock all read_set(T) U write_set(T)
∀ X ∈ read_set(T)
if XX.date >= birthdate(T) then
release all locks
ABORT
```
### Virtual World Consistency