Struct ClustersToFreeList 

pub(super) struct ClustersToFreeList {
    list: Mutex<Vec<ClustersToFreeEntry>>,
}

List of clusters that are no longer in use, and should be freed.

Shared between Qcow2 and its Allocator.

Fields

list: Mutex<Vec<ClustersToFreeEntry>>

The list itself.

Synchronous mutex because it is never to be held across .await points.

Implementations

impl ClustersToFreeList

pub fn push(&self, entry: ClustersToFreeEntry)

Mark entry as a cluster to be freed.

pub fn is_empty(&self) -> bool

Check whether the list is empty.

pub fn take(&self) -> Vec<ClustersToFreeEntry>

Remove all entries from the list and return them.

pub fn pending_guard( self: &Arc<Self>, entry: ClustersToFreeEntry, ) -> PendingClusters

Create a guard that enters entry into the list when dropped, unless disarmed.

This is for use in allocation paths, where a cluster is allocated, not yet hooked up, and anything might cause the hooking-up not to happen, in which case entry should be dropped. Once it is hooked up, the guard will be disarmed, thus making the cluster permanent.

Trait Implementations

impl Default for ClustersToFreeList

fn default() -> ClustersToFreeList

Returns the “default value” for a type.