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Refactor integrated-timers

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This commit is contained in:
Dániel Buga
2024-11-26 23:54:21 +01:00
parent 406d377b75
commit 5a5495aac4
32 changed files with 611 additions and 1182 deletions
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24
embassy-time/Cargo.toml
View File

@@ -42,29 +42,6 @@ defmt-timestamp-uptime-tus = ["defmt"]
## Create a `MockDriver` that can be manually advanced for testing purposes.
mock-driver = ["tick-hz-1_000_000"]
#! ### Generic Queue
## Create a global, generic queue that can be used with any executor.
## To use this you must have a time driver provided.
generic-queue = []
#! The following features set how many timers are used for the generic queue. At most one
#! `generic-queue-*` feature can be enabled. If none is enabled, a default of 64 timers is used.
#!
#! When using embassy-time from libraries, you should *not* enable any `generic-queue-*` feature, to allow the
#! end user to pick.
## Generic Queue with 8 timers
generic-queue-8 = ["generic-queue"]
## Generic Queue with 16 timers
generic-queue-16 = ["generic-queue"]
## Generic Queue with 32 timers
generic-queue-32 = ["generic-queue"]
## Generic Queue with 64 timers
generic-queue-64 = ["generic-queue"]
## Generic Queue with 128 timers
generic-queue-128 = ["generic-queue"]
#! ### Tick Rate
#!
#! At most 1 `tick-*` feature can be enabled. If none is enabled, a default of 1MHz is used.
@@ -419,7 +396,6 @@ embedded-hal-async = { version = "1.0" }
futures-util = { version = "0.3.17", default-features = false }
critical-section = "1.1"
cfg-if = "1.0.0"
heapless = "0.8"
document-features = "0.2.7"

85
embassy-time/src/driver_mock.rs
View File

@@ -1,7 +1,7 @@
use core::cell::RefCell;
use critical_section::Mutex as CsMutex;
use embassy_time_driver::{AlarmHandle, Driver};
use embassy_time_driver::Driver;
use crate::{Duration, Instant};
@@ -60,15 +60,13 @@ impl MockDriver {
let now = inner.now.as_ticks();
inner
.alarm
.as_mut()
.filter(|alarm| alarm.timestamp <= now)
.map(|alarm| {
alarm.timestamp = u64::MAX;
if inner.alarm.timestamp <= now {
inner.alarm.timestamp = u64::MAX;
(alarm.callback, alarm.ctx)
})
Some((inner.alarm.callback, inner.alarm.ctx))
} else {
None
}
})
};
@@ -76,68 +74,48 @@ impl MockDriver {
(callback)(ctx);
}
}
}
impl Driver for MockDriver {
fn now(&self) -> u64 {
critical_section::with(|cs| self.0.borrow_ref(cs).now).as_ticks()
}
unsafe fn allocate_alarm(&self) -> Option<AlarmHandle> {
/// Configures a callback to be called when the alarm fires.
pub fn set_alarm_callback(&self, callback: fn(*mut ()), ctx: *mut ()) {
critical_section::with(|cs| {
let mut inner = self.0.borrow_ref_mut(cs);
if inner.alarm.is_some() {
None
} else {
inner.alarm.replace(AlarmState::new());
Some(AlarmHandle::new(0))
}
})
}
fn set_alarm_callback(&self, _alarm: AlarmHandle, callback: fn(*mut ()), ctx: *mut ()) {
critical_section::with(|cs| {
let mut inner = self.0.borrow_ref_mut(cs);
let Some(alarm) = inner.alarm.as_mut() else {
panic!("Alarm not allocated");
};
alarm.callback = callback;
alarm.ctx = ctx;
inner.alarm.callback = callback;
inner.alarm.ctx = ctx;
});
}
fn set_alarm(&self, _alarm: AlarmHandle, timestamp: u64) -> bool {
/// Sets the alarm to fire at the specified timestamp.
pub fn set_alarm(&self, timestamp: u64) -> bool {
critical_section::with(|cs| {
let mut inner = self.0.borrow_ref_mut(cs);
if timestamp <= inner.now.as_ticks() {
false
} else {
let Some(alarm) = inner.alarm.as_mut() else {
panic!("Alarm not allocated");
};
alarm.timestamp = timestamp;
inner.alarm.timestamp = timestamp;
true
}
})
}
}
impl Driver for MockDriver {
fn now(&self) -> u64 {
critical_section::with(|cs| self.0.borrow_ref(cs).now).as_ticks()
}
}
struct InnerMockDriver {
now: Instant,
alarm: Option<AlarmState>,
alarm: AlarmState,
}
impl InnerMockDriver {
const fn new() -> Self {
Self {
now: Instant::from_ticks(0),
alarm: None,
alarm: AlarmState::new(),
}
}
}
@@ -189,8 +167,7 @@ mod tests {
setup();
let driver = MockDriver::get();
let alarm = unsafe { AlarmHandle::new(0) };
assert_eq!(false, driver.set_alarm(alarm, driver.now()));
assert_eq!(false, driver.set_alarm(driver.now()));
}
#[test]
@@ -199,23 +176,11 @@ mod tests {
setup();
let driver = MockDriver::get();
let alarm = unsafe { driver.allocate_alarm() }.expect("No alarms available");
static mut CALLBACK_CALLED: bool = false;
let ctx = &mut () as *mut ();
driver.set_alarm_callback(alarm, |_| unsafe { CALLBACK_CALLED = true }, ctx);
driver.set_alarm(alarm, driver.now() + 1);
driver.set_alarm_callback(|_| unsafe { CALLBACK_CALLED = true }, core::ptr::null_mut());
driver.set_alarm(driver.now() + 1);
assert_eq!(false, unsafe { CALLBACK_CALLED });
driver.advance(Duration::from_secs(1));
assert_eq!(true, unsafe { CALLBACK_CALLED });
}
#[test]
#[serial]
fn test_allocate_alarm() {
setup();
let driver = MockDriver::get();
assert!(unsafe { driver.allocate_alarm() }.is_some());
assert!(unsafe { driver.allocate_alarm() }.is_none());
}
}

119
embassy-time/src/driver_std.rs
View File

@@ -1,53 +1,38 @@
use core::sync::atomic::{AtomicU8, Ordering};
use std::cell::{RefCell, UnsafeCell};
use std::mem::MaybeUninit;
use std::sync::{Condvar, Mutex, Once};
use std::time::{Duration as StdDuration, Instant as StdInstant};
use std::{mem, ptr, thread};
use std::{ptr, thread};
use critical_section::Mutex as CsMutex;
use embassy_time_driver::{AlarmHandle, Driver};
const ALARM_COUNT: usize = 4;
use embassy_time_driver::Driver;
use embassy_time_queue_driver::GlobalTimerQueue;
struct AlarmState {
timestamp: u64,
// This is really a Option<(fn(*mut ()), *mut ())>
// but fn pointers aren't allowed in const yet
callback: *const (),
ctx: *mut (),
}
unsafe impl Send for AlarmState {}
impl AlarmState {
const fn new() -> Self {
Self {
timestamp: u64::MAX,
callback: ptr::null(),
ctx: ptr::null_mut(),
}
Self { timestamp: u64::MAX }
}
}
struct TimeDriver {
alarm_count: AtomicU8,
once: Once,
// The STD Driver implementation requires the alarms' mutex to be reentrant, which the STD Mutex isn't
// The STD Driver implementation requires the alarm's mutex to be reentrant, which the STD Mutex isn't
// Fortunately, mutexes based on the `critical-section` crate are reentrant, because the critical sections
// themselves are reentrant
alarms: UninitCell<CsMutex<RefCell<[AlarmState; ALARM_COUNT]>>>,
alarm: UninitCell<CsMutex<RefCell<AlarmState>>>,
zero_instant: UninitCell<StdInstant>,
signaler: UninitCell<Signaler>,
}
embassy_time_driver::time_driver_impl!(static DRIVER: TimeDriver = TimeDriver {
alarm_count: AtomicU8::new(0),
once: Once::new(),
alarms: UninitCell::uninit(),
alarm: UninitCell::uninit(),
zero_instant: UninitCell::uninit(),
signaler: UninitCell::uninit(),
});
@@ -55,8 +40,8 @@ embassy_time_driver::time_driver_impl!(static DRIVER: TimeDriver = TimeDriver {
impl TimeDriver {
fn init(&self) {
self.once.call_once(|| unsafe {
self.alarms
.write(CsMutex::new(RefCell::new([const { AlarmState::new() }; ALARM_COUNT])));
self.alarm
.write(CsMutex::new(RefCell::new(const { AlarmState::new() })));
self.zero_instant.write(StdInstant::now());
self.signaler.write(Signaler::new());
@@ -70,36 +55,13 @@ impl TimeDriver {
let now = DRIVER.now();
let next_alarm = critical_section::with(|cs| {
let alarms = unsafe { DRIVER.alarms.as_ref() }.borrow(cs);
loop {
let pending = alarms
.borrow_mut()
.iter_mut()
.find(|alarm| alarm.timestamp <= now)
.map(|alarm| {
alarm.timestamp = u64::MAX;
let mut alarm = unsafe { DRIVER.alarm.as_ref() }.borrow_ref_mut(cs);
if alarm.timestamp <= now {
alarm.timestamp = u64::MAX;
(alarm.callback, alarm.ctx)
});
if let Some((callback, ctx)) = pending {
// safety:
// - we can ignore the possiblity of `f` being unset (null) because of the safety contract of `allocate_alarm`.
// - other than that we only store valid function pointers into alarm.callback
let f: fn(*mut ()) = unsafe { mem::transmute(callback) };
f(ctx);
} else {
// No alarm due
break;
}
TIMER_QUEUE_DRIVER.dispatch();
}
alarms
.borrow()
.iter()
.map(|alarm| alarm.timestamp)
.min()
.unwrap_or(u64::MAX)
alarm.timestamp
});
// Ensure we don't overflow
@@ -110,6 +72,17 @@ impl TimeDriver {
unsafe { DRIVER.signaler.as_ref() }.wait_until(until);
}
}
fn set_alarm(&self, timestamp: u64) -> bool {
self.init();
critical_section::with(|cs| {
let mut alarm = unsafe { self.alarm.as_ref() }.borrow_ref_mut(cs);
alarm.timestamp = timestamp;
unsafe { self.signaler.as_ref() }.signal();
});
true
}
}
impl Driver for TimeDriver {
@@ -119,43 +92,6 @@ impl Driver for TimeDriver {
let zero = unsafe { self.zero_instant.read() };
StdInstant::now().duration_since(zero).as_micros() as u64
}
unsafe fn allocate_alarm(&self) -> Option<AlarmHandle> {
let id = self.alarm_count.fetch_update(Ordering::AcqRel, Ordering::Acquire, |x| {
if x < ALARM_COUNT as u8 {
Some(x + 1)
} else {
None
}
});
match id {
Ok(id) => Some(AlarmHandle::new(id)),
Err(_) => None,
}
}
fn set_alarm_callback(&self, alarm: AlarmHandle, callback: fn(*mut ()), ctx: *mut ()) {
self.init();
critical_section::with(|cs| {
let mut alarms = unsafe { self.alarms.as_ref() }.borrow_ref_mut(cs);
let alarm = &mut alarms[alarm.id() as usize];
alarm.callback = callback as *const ();
alarm.ctx = ctx;
});
}
fn set_alarm(&self, alarm: AlarmHandle, timestamp: u64) -> bool {
self.init();
critical_section::with(|cs| {
let mut alarms = unsafe { self.alarms.as_ref() }.borrow_ref_mut(cs);
let alarm = &mut alarms[alarm.id() as usize];
alarm.timestamp = timestamp;
unsafe { self.signaler.as_ref() }.signal();
});
true
}
}
struct Signaler {
@@ -228,3 +164,8 @@ impl<T: Copy> UninitCell<T> {
ptr::read(self.as_mut_ptr())
}
}
embassy_time_queue_driver::timer_queue_impl!(
static TIMER_QUEUE_DRIVER: GlobalTimerQueue
= GlobalTimerQueue::new(|next_expiration| DRIVER.set_alarm(next_expiration))
);

80
embassy-time/src/driver_wasm.rs
View File

@@ -1,28 +1,22 @@
use core::sync::atomic::{AtomicU8, Ordering};
use std::cell::UnsafeCell;
use std::mem::MaybeUninit;
use std::ptr;
use std::sync::{Mutex, Once};
use embassy_time_driver::{AlarmHandle, Driver};
use embassy_time_driver::Driver;
use embassy_time_queue_driver::GlobalTimerQueue;
use wasm_bindgen::prelude::*;
use wasm_timer::Instant as StdInstant;
const ALARM_COUNT: usize = 4;
struct AlarmState {
token: Option<f64>,
closure: Option<Closure<dyn FnMut() + 'static>>,
}
unsafe impl Send for AlarmState {}
impl AlarmState {
const fn new() -> Self {
Self {
token: None,
closure: None,
}
Self { token: None }
}
}
@@ -33,66 +27,32 @@ extern "C" {
}
struct TimeDriver {
alarm_count: AtomicU8,
once: Once,
alarms: UninitCell<Mutex<[AlarmState; ALARM_COUNT]>>,
alarm: UninitCell<Mutex<AlarmState>>,
zero_instant: UninitCell<StdInstant>,
closure: UninitCell<Closure<dyn FnMut()>>,
}
embassy_time_driver::time_driver_impl!(static DRIVER: TimeDriver = TimeDriver {
alarm_count: AtomicU8::new(0),
once: Once::new(),
alarms: UninitCell::uninit(),
alarm: UninitCell::uninit(),
zero_instant: UninitCell::uninit(),
closure: UninitCell::uninit()
});
impl TimeDriver {
fn init(&self) {
self.once.call_once(|| unsafe {
self.alarms
.write(Mutex::new([const { AlarmState::new() }; ALARM_COUNT]));
self.alarm.write(Mutex::new(const { AlarmState::new() }));
self.zero_instant.write(StdInstant::now());
self.closure
.write(Closure::new(Box::new(|| TIMER_QUEUE_DRIVER.dispatch())));
});
}
}
impl Driver for TimeDriver {
fn now(&self) -> u64 {
fn set_alarm(&self, timestamp: u64) -> bool {
self.init();
let zero = unsafe { self.zero_instant.read() };
StdInstant::now().duration_since(zero).as_micros() as u64
}
unsafe fn allocate_alarm(&self) -> Option<AlarmHandle> {
let id = self.alarm_count.fetch_update(Ordering::AcqRel, Ordering::Acquire, |x| {
if x < ALARM_COUNT as u8 {
Some(x + 1)
} else {
None
}
});
match id {
Ok(id) => Some(AlarmHandle::new(id)),
Err(_) => None,
}
}
fn set_alarm_callback(&self, alarm: AlarmHandle, callback: fn(*mut ()), ctx: *mut ()) {
self.init();
let mut alarms = unsafe { self.alarms.as_ref() }.lock().unwrap();
let alarm = &mut alarms[alarm.id() as usize];
alarm.closure.replace(Closure::new(move || {
callback(ctx);
}));
}
fn set_alarm(&self, alarm: AlarmHandle, timestamp: u64) -> bool {
self.init();
let mut alarms = unsafe { self.alarms.as_ref() }.lock().unwrap();
let alarm = &mut alarms[alarm.id() as usize];
let mut alarm = unsafe { self.alarm.as_ref() }.lock().unwrap();
if let Some(token) = alarm.token {
clearTimeout(token);
}
@@ -102,13 +62,22 @@ impl Driver for TimeDriver {
false
} else {
let timeout = (timestamp - now) as u32;
alarm.token = Some(setTimeout(alarm.closure.as_ref().unwrap(), timeout / 1000));
alarm.token = Some(setTimeout(unsafe { self.closure.as_ref() }, timeout / 1000));
true
}
}
}
impl Driver for TimeDriver {
fn now(&self) -> u64 {
self.init();
let zero = unsafe { self.zero_instant.read() };
StdInstant::now().duration_since(zero).as_micros() as u64
}
}
pub(crate) struct UninitCell<T>(MaybeUninit<UnsafeCell<T>>);
unsafe impl<T> Send for UninitCell<T> {}
unsafe impl<T> Sync for UninitCell<T> {}
@@ -139,3 +108,8 @@ impl<T: Copy> UninitCell<T> {
ptr::read(self.as_mut_ptr())
}
}
embassy_time_queue_driver::timer_queue_impl!(
static TIMER_QUEUE_DRIVER: GlobalTimerQueue
= GlobalTimerQueue::new(|next_expiration| DRIVER.set_alarm(next_expiration))
);

2
embassy-time/src/lib.rs
View File

@@ -25,8 +25,6 @@ pub use driver_mock::MockDriver;
mod driver_std;
#[cfg(feature = "wasm")]
mod driver_wasm;
#[cfg(feature = "generic-queue")]
mod queue_generic;
pub use delay::{block_for, Delay};
pub use duration::Duration;

346
embassy-time/src/queue_generic.rs
View File

@@ -1,346 +0,0 @@
use core::cell::RefCell;
use core::cmp::{min, Ordering};
use core::task::Waker;
use critical_section::Mutex;
use embassy_time_driver::{allocate_alarm, set_alarm, set_alarm_callback, AlarmHandle};
use embassy_time_queue_driver::TimerQueue;
use heapless::Vec;
use crate::Instant;
#[cfg(feature = "generic-queue-8")]
const QUEUE_SIZE: usize = 8;
#[cfg(feature = "generic-queue-16")]
const QUEUE_SIZE: usize = 16;
#[cfg(feature = "generic-queue-32")]
const QUEUE_SIZE: usize = 32;
#[cfg(feature = "generic-queue-64")]
const QUEUE_SIZE: usize = 64;
#[cfg(feature = "generic-queue-128")]
const QUEUE_SIZE: usize = 128;
#[cfg(not(any(
feature = "generic-queue-8",
feature = "generic-queue-16",
feature = "generic-queue-32",
feature = "generic-queue-64",
feature = "generic-queue-128"
)))]
const QUEUE_SIZE: usize = 64;
#[derive(Debug)]
struct Timer {
at: Instant,
waker: Waker,
}
impl PartialEq for Timer {
fn eq(&self, other: &Self) -> bool {
self.at == other.at
}
}
impl Eq for Timer {}
impl PartialOrd for Timer {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.at.partial_cmp(&other.at)
}
}
impl Ord for Timer {
fn cmp(&self, other: &Self) -> Ordering {
self.at.cmp(&other.at)
}
}
struct InnerQueue {
queue: Vec<Timer, QUEUE_SIZE>,
alarm: AlarmHandle,
}
impl InnerQueue {
fn schedule_wake(&mut self, at: Instant, waker: &Waker) {
self.queue
.iter_mut()
.find(|timer| timer.waker.will_wake(waker))
.map(|timer| {
timer.at = min(timer.at, at);
})
.unwrap_or_else(|| {
let mut timer = Timer {
waker: waker.clone(),
at,
};
loop {
match self.queue.push(timer) {
Ok(()) => break,
Err(e) => timer = e,
}
self.queue.pop().unwrap().waker.wake();
}
});
// Don't wait for the alarm callback to trigger and directly
// dispatch all timers that are already due
//
// Then update the alarm if necessary
self.dispatch();
}
fn dispatch(&mut self) {
loop {
let now = Instant::now();
let mut next_alarm = Instant::MAX;
let mut i = 0;
while i < self.queue.len() {
let timer = &self.queue[i];
if timer.at <= now {
let timer = self.queue.swap_remove(i);
timer.waker.wake();
} else {
next_alarm = min(next_alarm, timer.at);
i += 1;
}
}
if self.update_alarm(next_alarm) {
break;
}
}
}
fn update_alarm(&mut self, next_alarm: Instant) -> bool {
if next_alarm == Instant::MAX {
true
} else {
set_alarm(self.alarm, next_alarm.as_ticks())
}
}
fn handle_alarm(&mut self) {
self.dispatch();
}
}
struct Queue {
inner: Mutex<RefCell<Option<InnerQueue>>>,
}
impl Queue {
const fn new() -> Self {
Self {
inner: Mutex::new(RefCell::new(None)),
}
}
fn schedule_wake(&'static self, at: Instant, waker: &Waker) {
critical_section::with(|cs| {
let mut inner = self.inner.borrow_ref_mut(cs);
inner
.get_or_insert_with(|| {
let handle = unsafe { allocate_alarm() }.unwrap();
set_alarm_callback(handle, Self::handle_alarm_callback, self as *const _ as _);
InnerQueue {
queue: Vec::new(),
alarm: handle,
}
})
.schedule_wake(at, waker)
});
}
fn handle_alarm(&self) {
critical_section::with(|cs| self.inner.borrow_ref_mut(cs).as_mut().unwrap().handle_alarm())
}
fn handle_alarm_callback(ctx: *mut ()) {
unsafe { (ctx as *const Self).as_ref().unwrap() }.handle_alarm();
}
}
impl TimerQueue for Queue {
fn schedule_wake(&'static self, at: u64, waker: &Waker) {
Queue::schedule_wake(self, Instant::from_ticks(at), waker);
}
}
embassy_time_queue_driver::timer_queue_impl!(static QUEUE: Queue = Queue::new());
#[cfg(test)]
#[cfg(feature = "mock-driver")]
mod tests {
use core::sync::atomic::{AtomicBool, Ordering};
use core::task::Waker;
use std::sync::Arc;
use std::task::Wake;
use serial_test::serial;
use crate::driver_mock::MockDriver;
use crate::queue_generic::QUEUE;
use crate::{Duration, Instant};
struct TestWaker {
pub awoken: AtomicBool,
}
impl Wake for TestWaker {
fn wake(self: Arc<Self>) {
self.awoken.store(true, Ordering::Relaxed);
}
fn wake_by_ref(self: &Arc<Self>) {
self.awoken.store(true, Ordering::Relaxed);
}
}
fn test_waker() -> (Arc<TestWaker>, Waker) {
let arc = Arc::new(TestWaker {
awoken: AtomicBool::new(false),
});
let waker = Waker::from(arc.clone());
(arc, waker)
}
fn setup() {
MockDriver::get().reset();
critical_section::with(|cs| *QUEUE.inner.borrow_ref_mut(cs) = None);
}
fn queue_len() -> usize {
critical_section::with(|cs| {
QUEUE
.inner
.borrow_ref(cs)
.as_ref()
.map(|inner| inner.queue.iter().count())
.unwrap_or(0)
})
}
#[test]
#[serial]
fn test_schedule() {
setup();
assert_eq!(queue_len(), 0);
let (flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(1), &waker);
assert!(!flag.awoken.load(Ordering::Relaxed));
assert_eq!(queue_len(), 1);
}
#[test]
#[serial]
fn test_schedule_same() {
setup();
let (_flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(1), &waker);
assert_eq!(queue_len(), 1);
QUEUE.schedule_wake(Instant::from_secs(1), &waker);
assert_eq!(queue_len(), 1);
QUEUE.schedule_wake(Instant::from_secs(100), &waker);
assert_eq!(queue_len(), 1);
let (_flag2, waker2) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(100), &waker2);
assert_eq!(queue_len(), 2);
}
#[test]
#[serial]
fn test_trigger() {
setup();
let (flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(100), &waker);
assert!(!flag.awoken.load(Ordering::Relaxed));
MockDriver::get().advance(Duration::from_secs(99));
assert!(!flag.awoken.load(Ordering::Relaxed));
assert_eq!(queue_len(), 1);
MockDriver::get().advance(Duration::from_secs(1));
assert!(flag.awoken.load(Ordering::Relaxed));
assert_eq!(queue_len(), 0);
}
#[test]
#[serial]
fn test_immediate_trigger() {
setup();
let (flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(100), &waker);
MockDriver::get().advance(Duration::from_secs(50));
let (flag2, waker2) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(40), &waker2);
assert!(!flag.awoken.load(Ordering::Relaxed));
assert!(flag2.awoken.load(Ordering::Relaxed));
assert_eq!(queue_len(), 1);
}
#[test]
#[serial]
fn test_queue_overflow() {
setup();
for i in 1..super::QUEUE_SIZE {
let (flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(310), &waker);
assert_eq!(queue_len(), i);
assert!(!flag.awoken.load(Ordering::Relaxed));
}
let (flag, waker) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(300), &waker);
assert_eq!(queue_len(), super::QUEUE_SIZE);
assert!(!flag.awoken.load(Ordering::Relaxed));
let (flag2, waker2) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(305), &waker2);
assert_eq!(queue_len(), super::QUEUE_SIZE);
assert!(flag.awoken.load(Ordering::Relaxed));
let (_flag3, waker3) = test_waker();
QUEUE.schedule_wake(Instant::from_secs(320), &waker3);
assert_eq!(queue_len(), super::QUEUE_SIZE);
assert!(flag2.awoken.load(Ordering::Relaxed));
}
}