forked from M-Labs/zynq-rs
mutex: add async version of lock
This commit is contained in:
parent
56c27e98e4
commit
605c8f73a6
|
@ -1,6 +1,9 @@
|
|||
use core::ops::{Deref, DerefMut};
|
||||
use core::sync::atomic::{AtomicU32, Ordering};
|
||||
use core::cell::UnsafeCell;
|
||||
use core::task::{Context, Poll};
|
||||
use core::pin::Pin;
|
||||
use core::future::Future;
|
||||
use super::{
|
||||
spin_lock_yield, notify_spin_lock,
|
||||
asm::{enter_critical, exit_critical}
|
||||
|
@ -20,6 +23,23 @@ pub struct Mutex<T> {
|
|||
unsafe impl<T: Send> Sync for Mutex<T> {}
|
||||
unsafe impl<T: Send> Send for Mutex<T> {}
|
||||
|
||||
struct Fut<'a, T>(&'a Mutex<T>);
|
||||
|
||||
impl<'a, T> Future for Fut<'a, T> {
|
||||
type Output = MutexGuard<'a, T>;
|
||||
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
|
||||
let irq = unsafe { enter_critical() };
|
||||
if self.0.locked.compare_exchange_weak(UNLOCKED, LOCKED, Ordering::AcqRel, Ordering::Relaxed).is_err() {
|
||||
unsafe { exit_critical(irq) };
|
||||
cx.waker().wake_by_ref();
|
||||
Poll::Pending
|
||||
}
|
||||
else {
|
||||
Poll::Ready(MutexGuard { mutex: self.0, irq })
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> Mutex<T> {
|
||||
/// Constructor, const-fn
|
||||
pub const fn new(inner: T) -> Self {
|
||||
|
@ -42,6 +62,10 @@ impl<T> Mutex<T> {
|
|||
MutexGuard { mutex: self, irq }
|
||||
}
|
||||
|
||||
pub async fn async_lock(&self) -> MutexGuard<'_, T> {
|
||||
Fut(&self).await
|
||||
}
|
||||
|
||||
pub fn try_lock(&self) -> Option<MutexGuard<T>> {
|
||||
let irq = unsafe { enter_critical() };
|
||||
if self.locked.compare_exchange_weak(UNLOCKED, LOCKED, Ordering::AcqRel, Ordering::Relaxed).is_err() {
|
||||
|
|
Loading…
Reference in New Issue