Struct OccLockBuckets 

pub struct OccLockBuckets(/* private fields */);

A pool of mutex locks used to validate optimistic transactions.

Only consulted when the validation policy is OccValidationPolicy::ValidateParallel. Hand it to OptimisticTransactionDBOptions::set_shared_lock_buckets to make several databases validate against one pool instead of each allocating its own.

Cloning is cheap and produces another handle to the same pool. The pool itself lives as long as any handle or any options value or database that was given one, so it is fine to drop every Rust handle right after the set_shared_lock_buckets call.

Implementations

impl OccLockBuckets

pub fn new(bucket_count: usize, cache_aligned: bool) -> Self

Allocates a pool of bucket_count locks.

More buckets mean less contention between transactions validating at the same time, and more memory. cache_aligned pads each lock out to a cache line, which avoids false sharing between neighbouring buckets at the cost of more memory again. RocksDB has historically used false here.

Panics

Panics if RocksDB could not allocate the pool.

pub fn approximate_memory_usage(&self) -> usize

Estimates how much memory this pool occupies, in bytes.

Trait Implementations

impl Clone for OccLockBuckets

fn clone(&self) -> OccLockBuckets

Returns a duplicate of the value.

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

Performs copy-assignment from source.