Struct tokio::runtime::task::core::Header

#[repr(C)]
pub(crate) struct Header {
    pub(super) state: State,
    pub(super) queue_next: UnsafeCell<Option<NonNull<Header>>>,
    pub(super) vtable: &'static Vtable,
    pub(super) owner_id: UnsafeCell<Option<NonZeroU64>>,
}

Crate public as this is also needed by the pool.

Fields

state: State

Task state.

queue_next: UnsafeCell<Option<NonNull<Header>>>

Pointer to next task, used with the injection queue.

vtable: &'static Vtable

Table of function pointers for executing actions on the task.

owner_id: UnsafeCell<Option<NonZeroU64>>

This integer contains the id of the OwnedTasks or LocalOwnedTasks that this task is stored in. If the task is not in any list, should be the id of the list that it was previously in, or None if it has never been in any list.

Once a task has been bound to a list, it can never be bound to another list, even if removed from the first list.

The id is not unset when removed from a list because we want to be able to read the id without synchronization, even if it is concurrently being removed from the list.

Implementations

impl Header

pub(super) unsafe fn set_next(&self, next: Option<NonNull<Header>>)

pub(super) unsafe fn set_owner_id(&self, owner: NonZeroU64)

pub(super) fn get_owner_id(&self) -> Option<NonZeroU64>

pub(super) unsafe fn get_trailer(me: NonNull<Header>) -> NonNull<Trailer>

Gets a pointer to the Trailer of the task containing this Header.

Safety

The provided raw pointer must point at the header of a task.

pub(super) unsafe fn get_scheduler<S>(me: NonNull<Header>) -> NonNull<S>

Gets a pointer to the scheduler of the task containing this Header.

Safety

The provided raw pointer must point at the header of a task.

The generic type S must be set to the correct scheduler type for this task.

pub(super) unsafe fn get_id_ptr(me: NonNull<Header>) -> NonNull<Id>

Gets a pointer to the id of the task containing this Header.

Safety

The provided raw pointer must point at the header of a task.

pub(super) unsafe fn get_id(me: NonNull<Header>) -> Id

Gets the id of the task containing this Header.

Safety

The provided raw pointer must point at the header of a task.

Trait Implementations

impl Send for Header

impl Sync for Header