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#![cfg_attr(
any(not(all(tokio_unstable, feature = "full")), target_family = "wasm"),
allow(dead_code)
)]
use crate::runtime::task;
pub(crate) struct Synced {
/// True if the queue is closed.
pub(super) is_closed: bool,
/// Linked-list head.
pub(super) head: Option<task::RawTask>,
/// Linked-list tail.
pub(super) tail: Option<task::RawTask>,
}
unsafe impl Send for Synced {}
unsafe impl Sync for Synced {}
impl Synced {
pub(super) fn pop<T: 'static>(&mut self) -> Option<task::Notified<T>> {
let task = self.head?;
self.head = unsafe { task.get_queue_next() };
if self.head.is_none() {
self.tail = None;
}
unsafe { task.set_queue_next(None) };
// safety: a `Notified` is pushed into the queue and now it is popped!
Some(unsafe { task::Notified::from_raw(task) })
}
pub(crate) fn is_empty(&self) -> bool {
self.head.is_none()
}
}