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rtic-time: Make Send happy

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This commit is contained in:
Emil Fresk 2023-01-28 21:11:18 +01:00
parent e6c82b7a4d
commit 06867ca440
3 changed files with 26 additions and 6 deletions
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2
rtic-channel/src/lib.rs
View file

@ -532,7 +532,7 @@ mod tests {
#[tokio::test]
async fn stress_channel() {
const NUM_RUNS: usize = 1_000000;
const NUM_RUNS: usize = 1_000;
const QUEUE_SIZE: usize = 10;
let (s, mut r) = make_channel!(u32, QUEUE_SIZE);

2
rtic-channel/src/wait_queue.rs
View file

@ -105,8 +105,6 @@ pub struct Link<T> {
_up: PhantomPinned,
}
unsafe impl<T> Send for Link<T> {}
impl<T: Clone> Link<T> {
const R: Ordering = Ordering::Relaxed;

28
rtic-time/src/lib.rs
View file

@ -73,6 +73,26 @@ pub struct TimerQueue<Mono: Monotonic> {
/// This indicates that there was a timeout.
pub struct TimeoutError;
/// This is needed to make the async closure in `delay_until` accept that we "share"
/// the link possible between threads.
struct LinkPtr<Mono: Monotonic>(*mut Option<linked_list::Link<WaitingWaker<Mono>>>);
impl<Mono: Monotonic> Clone for LinkPtr<Mono> {
fn clone(&self) -> Self {
LinkPtr(self.0)
}
}
impl<Mono: Monotonic> LinkPtr<Mono> {
/// This will dereference the pointer stored within and give out an `&mut`.
unsafe fn get(&mut self) -> &mut Option<linked_list::Link<WaitingWaker<Mono>>> {
&mut *self.0
}
}
unsafe impl<Mono: Monotonic> Send for LinkPtr<Mono> {}
unsafe impl<Mono: Monotonic> Sync for LinkPtr<Mono> {}
impl<Mono: Monotonic> TimerQueue<Mono> {
/// Make a new queue.
pub const fn new() -> Self {
@ -189,7 +209,9 @@ impl<Mono: Monotonic> TimerQueue<Mono> {
let mut link_ptr: Option<linked_list::Link<WaitingWaker<Mono>>> = None;
// Make this future `Drop`-safe, also shadow the original definition so we can't abuse it.
let link_ptr = &mut link_ptr as *mut Option<linked_list::Link<WaitingWaker<Mono>>>;
let mut link_ptr =
LinkPtr(&mut link_ptr as *mut Option<linked_list::Link<WaitingWaker<Mono>>>);
let mut link_ptr2 = link_ptr.clone();
let queue = &self.queue;
let marker = &AtomicUsize::new(0);
@ -205,7 +227,7 @@ impl<Mono: Monotonic> TimerQueue<Mono> {
// SAFETY: This pointer is only dereferenced here and on drop of the future
// which happens outside this `poll_fn`'s stack frame.
let link = unsafe { &mut *link_ptr };
let link = unsafe { link_ptr2.get() };
if link.is_none() {
let mut link_ref = link.insert(Link::new(WaitingWaker {
waker: cx.waker().clone(),
@ -231,7 +253,7 @@ impl<Mono: Monotonic> TimerQueue<Mono> {
// SAFETY: We only run this and dereference the pointer if we have
// exited the `poll_fn` below in the `drop(dropper)` call. The other dereference
// of this pointer is in the `poll_fn`.
if let Some(link) = unsafe { &mut *link_ptr } {
if let Some(link) = unsafe { link_ptr.get() } {
if link.val.was_poped.load(Ordering::Relaxed) {
// If it was poped from the queue there is no need to run delete
dropper.defuse();