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//! Timer queue operations.
use core::cell::Cell;
use super::TaskRef;
/// An item in the timer queue.
pub struct TimerQueueItem {
/// The next item in the queue.
///
/// If this field contains `Some`, the item is in the queue. The last item in the queue has a
/// value of `Some(dangling_pointer)`
pub next: Cell<Option<TaskRef>>,
/// The time at which this item expires.
pub expires_at: Cell<u64>,
}
unsafe impl Sync for TimerQueueItem {}
impl TimerQueueItem {
pub(crate) const fn new() -> Self {
Self {
next: Cell::new(None),
expires_at: Cell::new(u64::MAX),
}
}
}
/// The operation to perform after `timer_enqueue` is called.
#[derive(Debug, Copy, Clone, PartialEq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[must_use]
pub enum TimerEnqueueOperation {
/// Enqueue the task (or update its expiration time).
Enqueue,
/// The task must not be enqueued in the timer queue.
Ignore,
}
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