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WaitGraph

featherdb_mvcc

Struct WaitGraph 

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pub struct WaitGraph { /* private fields */ }
Expand description

Wait-for graph for deadlock detection

Tracks which transactions are waiting for which other transactions. Used to detect cycles (deadlocks) in the wait graph.

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impl WaitGraph

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pub fn new() -> Self

Create a new empty wait graph

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pub fn add_wait(&mut self, waiter: TransactionId, holder: TransactionId)

Record that waiter is waiting for holder to release a lock

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pub fn remove_transaction(&mut self, txn: TransactionId)

Remove all wait edges involving this transaction (when it commits/aborts)

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pub fn detect_cycle(&self) -> Option<Vec<TransactionId>>

Detect if there’s a cycle in the wait graph Returns Some(cycle) if deadlock detected, where cycle is the list of txn IDs in the cycle

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pub fn select_victim(&self, cycle: &[TransactionId]) -> TransactionId

Select a victim transaction to abort (youngest = highest ID)

Trait Implementations§

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impl Default for WaitGraph

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fn default() -> Self

Returns the “default value” for a type. Read more

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