Enum TaskStatus 

pub enum TaskStatus {
    Queued,
    Running,
    Completed,
    Cancelled,
    Failed,
}

Status of a task within the executor.

Task status transitions follow a strict state machine: Queued → Running → (Completed | Cancelled | Failed)

State Transitions

• Queued: Initial state when task is spawned
• Running: Task is currently executing on a worker thread
• Completed: Task finished successfully
• Cancelled: Task was cancelled before or during execution
• Failed: Task encountered an error or panic

Variants

Queued

Task is queued but not yet started

Guarantees

• Task will eventually transition to Running
• Cancellation is possible in this state
• Memory has been allocated for task execution

Running

Task is currently running

Guarantees

• Task is actively executing on a worker thread
• Cancellation is cooperative in this state
• Progress is being made toward completion

Completed

Task completed successfully

Guarantees

• Task result is available via task handle
• No further state transitions possible
• Resources have been cleaned up

Cancelled

Task ended without a result

Reached when a cancel request is honored, or when the executor discards the task before it finishes (for example at shutdown). The task’s handle resolves to TaskError::Cancelled in both cases.

Guarantees

• Task did not complete normally
• Cancellation was requested and honored, or the task was discarded
• Resources have been cleaned up

Failed

Task failed with an error

Guarantees

• Task encountered an unrecoverable error
• Error information is available via task handle
• Resources have been cleaned up

Trait Implementations

impl Clone for TaskStatus

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TaskStatus

impl Debug for TaskStatus

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

Formats the value using the given formatter.

impl Display for TaskStatus

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

Formats the value using the given formatter.

impl Eq for TaskStatus

impl PartialEq for TaskStatus

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TaskStatus