Struct tokio::runtime::time::entry::TimerShared

pub(crate) struct TimerShared {
    pointers: Pointers<TimerShared>,
    cached_when: AtomicU64,
    true_when: AtomicU64,
    state: StateCell,
    _p: PhantomPinned,
}

The shared state structure of a timer. This structure is shared between the frontend (Entry) and driver backend.

Note that this structure is located inside the TimerEntry structure.

Fields

pointers: Pointers<TimerShared>

A link within the doubly-linked list of timers on a particular level and slot. Valid only if state is equal to Registered.

Only accessed under the entry lock.

cached_when: AtomicU64

The expiration time for which this entry is currently registered. Generally owned by the driver, but is accessed by the entry when not registered.

true_when: AtomicU64

The true expiration time. Set by the timer future, read by the driver.

state: StateCell

Current state. This records whether the timer entry is currently under the ownership of the driver, and if not, its current state (not complete, fired, error, etc).

_p: PhantomPinned

Implementations

impl TimerShared

unsafe fn addr_of_pointers(me: NonNull<Self>) -> NonNull<Pointers<TimerShared>>

impl TimerShared

pub(super) fn new() -> Self

pub(super) fn cached_when(&self) -> u64

Gets the cached time-of-expiration value.

pub(super) unsafe fn sync_when(&self) -> u64

Gets the true time-of-expiration value, and copies it into the cached time-of-expiration value.

SAFETY: Must be called with the driver lock held, and when this entry is not in any timer wheel lists.

unsafe fn set_cached_when(&self, when: u64)

Sets the cached time-of-expiration value.

SAFETY: Must be called with the driver lock held, and when this entry is not in any timer wheel lists.

pub(super) fn true_when(&self) -> u64

Returns the true time-of-expiration value, with relaxed memory ordering.

pub(super) unsafe fn set_expiration(&self, t: u64)

Sets the true time-of-expiration value, even if it is less than the current expiration or the timer is deregistered.

SAFETY: Must only be called with the driver lock held and the entry not in the timer wheel.

pub(super) fn extend_expiration(&self, t: u64) -> Result<(), ()>

Sets the true time-of-expiration only if it is after the current.

pub(super) fn handle(&self) -> TimerHandle

Returns a TimerHandle for this timer.

pub(super) fn might_be_registered(&self) -> bool

Returns true if the state of this timer indicates that the timer might be registered with the driver. This check is performed with relaxed ordering, but is conservative - if it returns false, the timer is definitely not registered.

Trait Implementations

impl Debug for TimerShared

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

Formats the value using the given formatter.

impl Link for TimerShared

type Handle = TimerHandle

Handle to the list entry.

type Target = TimerShared

Node type.

fn as_raw(handle: &Self::Handle) -> NonNull<Self::Target>

Convert the handle to a raw pointer without consuming the handle.

unsafe fn from_raw(ptr: NonNull<Self::Target>) -> Self::Handle

Convert the raw pointer to a handle

unsafe fn pointers( target: NonNull<Self::Target> ) -> NonNull<Pointers<Self::Target>>

Return the pointers for a node

impl Send for TimerShared

impl Sync for TimerShared