1//! Inject queue used to send wakeups to a work-stealing scheduler
2
3use crate::loom::sync::Mutex;
4use crate::runtime::task;
5
6mod pop;
7pub(crate) use pop::Pop;
8
9mod shared;
10pub(crate) use shared::Shared;
11
12mod synced;
13pub(crate) use synced::Synced;
14
15cfg_rt_multi_thread! {
16 mod rt_multi_thread;
17}
18
19mod metrics;
20
21/// Growable, MPMC queue used to inject new tasks into the scheduler and as an
22/// overflow queue when the local, fixed-size, array queue overflows.
23pub(crate) struct Inject<T: 'static> {
24 shared: Shared<T>,
25 synced: Mutex<Synced>,
26}
27
28impl<T: 'static> Inject<T> {
29 pub(crate) fn new() -> Inject<T> {
30 let (shared, synced) = Shared::new();
31
32 Inject {
33 shared,
34 synced: Mutex::new(synced),
35 }
36 }
37
38 // Kind of annoying to have to include the cfg here
39 #[cfg(tokio_taskdump)]
40 pub(crate) fn is_closed(&self) -> bool {
41 let synced = self.synced.lock();
42 self.shared.is_closed(&synced)
43 }
44
45 /// Closes the injection queue, returns `true` if the queue is open when the
46 /// transition is made.
47 pub(crate) fn close(&self) -> bool {
48 let mut synced = self.synced.lock();
49 self.shared.close(&mut synced)
50 }
51
52 /// Pushes a value into the queue.
53 ///
54 /// This does nothing if the queue is closed.
55 pub(crate) fn push(&self, task: task::Notified<T>) {
56 let mut synced = self.synced.lock();
57 // safety: passing correct `Synced`
58 unsafe { self.shared.push(&mut synced, task) }
59 }
60
61 pub(crate) fn pop(&self) -> Option<task::Notified<T>> {
62 if self.shared.is_empty() {
63 return None;
64 }
65
66 let mut synced = self.synced.lock();
67 // safety: passing correct `Synced`
68 unsafe { self.shared.pop(&mut synced) }
69 }
70}
71

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