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use core::convert::TryFrom;
use core::sync::atomic::AtomicUsize;
use core::sync::atomic::Ordering;
static DEFERRED_CALL: AtomicUsize = AtomicUsize::new(0);
pub struct DeferredCall(Task);
#[derive(Copy, Clone)]
pub enum Task {
Flashcalw = 0,
}
impl TryFrom<usize> for Task {
type Error = ();
fn try_from(value: usize) -> Result<Task, ()> {
match value {
0 => Ok(Task::Flashcalw),
_ => Err(()),
}
}
}
impl DeferredCall {
pub const unsafe fn new(task: Task) -> DeferredCall {
DeferredCall(task)
}
pub fn set(&self) {
DEFERRED_CALL.fetch_or(1 << self.0 as usize, Ordering::Relaxed);
}
pub fn has_tasks() -> bool {
DEFERRED_CALL.load(Ordering::Relaxed) != 0
}
pub fn next_pending() -> Option<Task> {
let val = DEFERRED_CALL.load(Ordering::Relaxed);
if val == 0 {
return None;
} else {
let bit = val.trailing_zeros() as usize;
let new_val = val & !(1 << bit);
DEFERRED_CALL.store(new_val, Ordering::Relaxed);
return Task::try_from(bit).ok();
}
}
}