Struct WeakTask 

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

A weak reference to a Task, obtained via Task::downgrade.

Does not prevent the task from being deallocated. Use upgrade to attempt to obtain a strong Task reference.

A WeakTask points at a worker’s identity (TaskInner), not at the shared progress cursor — so strong_count and is_alive report whether that worker is still around.

Implementations

impl WeakTask

pub fn upgrade(&self) -> Option<Task>

Attempts to upgrade to a strong Task.

Returns None if all strong references to the underlying task identity have already been dropped (i.e. the worker that owned it has exited).

pub fn strong_count(&self) -> usize

Returns the number of strong Task references to the underlying task identity. Used by is_alive, which the liveness sweep in set_threads relies on.

pub fn weak_count(&self) -> usize

Returns the number of weak WeakTask references to the underlying task identity.

pub fn is_alive(&self) -> bool

Returns true if at least one strong Task reference to this worker’s identity still exists. This is the exact “is this worker alive?” test the liveness sweep relies on — it is independent of how many twins share the worker’s progress cursor.

Trait Implementations

impl Clone for WeakTask

fn clone(&self) -> WeakTask

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WeakTask

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

Formats the value using the given formatter.