Struct LockTable 

pub struct LockTable { /* private fields */ }

The row-lock table. Keyed on stable (RelId, RowId); carries the wait-for graph used for deadlock detection.

Clone to match the engine’s other transient concurrency state (active_writer_versions) that rides on Engine; the shared (non-cloned) lock manager is Phase C.5, when the single engine lock is split.

Implementations

impl LockTable

pub fn new() -> Self

pub fn acquire( &mut self, rel: RelId, row: RowId, mode: LockMode, version: u64, policy: WaitPolicy, ) -> LockOutcome

Try to acquire mode on (rel, row) for transaction version. Re-locking a row this version already holds upgrades in place (idempotent for equal-or-weaker modes).

pub fn release_all(&mut self, version: u64)

Release every lock + wait held by version (transaction end: commit or abort). Removes it from all entries and the wait-for graph, and drops now-empty entries.

pub fn locked_row_count(&self) -> usize

Number of rows with at least one holder or waiter. For pg_locks enumeration (Phase C.4) and tests.

Trait Implementations

impl Clone for LockTable

fn clone(&self) -> LockTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LockTable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LockTable

fn default() -> LockTable

Returns the “default value” for a type.