Struct arc_swap::gen_lock::PrivateSharded

pub struct PrivateSharded<S> { /* private fields */ }

An alternative to PrivateUnsharded, but with configurable number of shards.

The PrivateUnsharded is almost identical to PrivateSharded<[Shard; 1]> (the implementation takes advantage of some details to avoid a little bit of overhead). It allows the user to choose the trade-of between contention during locking and size of the pointer and speed during writes.

Note on AsRef<[Shard]>

Rust provides the AsRef trait (or, actually any trait) up to arrays of 32 elements. If you need something bigger, you have to work around it with a newtype.

Trait Implementations

impl<S: Default> Default for PrivateSharded<S>

fn default() -> PrivateSharded<S>

Returns the “default value” for a type.

impl<S: AsRef<[Shard]> + Default> LockStorage for PrivateSharded<S>

type Shards = S

The type for keeping several shards.

fn gen_idx(&self) -> &AtomicUsize

Access to the generation index.

fn shards(&self) -> &Self::Shards

Access to the shards storage.

fn choose_shard(&self) -> usize

Pick one shard of the all selected.