libcortex_a9/sync_channel: new version compiled.
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@ -1,5 +1,6 @@
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#![no_std]
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#![no_main]
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#![feature(const_in_array_repeat_expressions)]
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extern crate alloc;
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@ -26,7 +27,7 @@ use libboard_zynq::{
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use libboard_zynq::ps7_init;
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use libcortex_a9::{
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mutex::Mutex,
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sync_channel::{self, sync_channel},
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sync_channel,
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};
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use libregister::RegisterR;
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use libsupport_zynq::{
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@ -160,9 +161,9 @@ pub fn main_core0() {
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let core1 = boot::Core1::start(false);
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let (mut core1_req, rx) = sync_channel(10);
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let (mut core1_req, rx) = sync_channel!(usize, 10);
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*CORE1_REQ.lock() = Some(rx);
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let (tx, mut core1_res) = sync_channel(10);
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let (tx, mut core1_res) = sync_channel!(usize, 10);
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*CORE1_RES.lock() = Some(tx);
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task::block_on(async {
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for i in 0..10 {
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@ -285,7 +286,7 @@ pub fn main_core1() {
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let mut res = res.unwrap();
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for i in req {
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res.send(*i * *i);
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res.send(i * i);
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}
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println!("core1 done!");
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@ -1,6 +1,7 @@
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#![no_std]
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#![feature(llvm_asm, global_asm)]
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#![feature(never_type)]
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#![feature(const_fn)]
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extern crate alloc;
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@ -1,115 +1,75 @@
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use core::{
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future::Future,
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pin::Pin,
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ptr::null_mut,
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sync::atomic::{AtomicPtr, Ordering},
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future::Future,
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ptr::drop_in_place,
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sync::atomic::{AtomicPtr, AtomicUsize, Ordering},
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task::{Context, Poll},
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};
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use alloc::{
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boxed::Box,
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sync::Arc,
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vec::Vec,
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};
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use alloc::boxed::Box;
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use super::asm::*;
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type Channel<T> = Vec<AtomicPtr<T>>;
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/// Create a bounded channel
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///
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/// Returns `(tx, rx)` where one should be used one the local core,
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/// and the other is to be shared with another core.
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pub fn sync_channel<T>(bound: usize) -> (Sender<T>, Receiver<T>) {
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// allow for bound=0
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let len = bound + 1;
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let mut channel = Vec::with_capacity(len);
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for _ in 0..len {
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channel.push(AtomicPtr::default());
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}
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let channel = Arc::new(channel);
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let sender = Sender {
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channel: channel.clone(),
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pos: 0,
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};
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let receiver = Receiver {
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channel: channel,
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pos: 0,
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};
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(sender, receiver)
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pub struct Sender<'a, T> where T: Clone {
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list: &'a [AtomicPtr<T>],
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write: &'a AtomicUsize,
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read: &'a AtomicUsize,
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}
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/// Sending half of a channel
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pub struct Sender<T> {
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channel: Arc<Channel<T>>,
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pos: usize,
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pub struct Receiver<'a, T> where T: Clone {
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list: &'a [AtomicPtr<T>],
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write: &'a AtomicUsize,
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read: &'a AtomicUsize,
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}
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impl<T> Sender<T> {
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/// Blocking send
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pub fn send<B: Into<Box<T>>>(&mut self, content: B) {
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let ptr = Box::into_raw(content.into());
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let entry = &self.channel[self.pos];
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// try to write the new pointer if the current pointer is
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// NULL, retrying while it is not NULL
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while entry.compare_and_swap(null_mut(), ptr, Ordering::Acquire) != null_mut() {
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// power-saving
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wfe();
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}
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dsb();
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// wake power-saving receivers
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sev();
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// advance
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self.pos += 1;
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// wrap
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if self.pos >= self.channel.len() {
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self.pos = 0;
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}
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impl<'a, T> Sender<'a, T> where T: Clone {
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pub const fn new(list: &'static [AtomicPtr<T>], write: &'static AtomicUsize, read: &'static AtomicUsize) -> Self {
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Sender {list, write, read}
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}
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/// Non-blocking send, handing you back ownership of the content on **failure**
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pub fn try_send<B: Into<Box<T>>>(&mut self, content: B) -> Option<Box<T>> {
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let ptr = Box::into_raw(content.into());
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let entry = &self.channel[self.pos];
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// try to write the new pointer if the current pointer is
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// NULL
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if entry.compare_and_swap(null_mut(), ptr, Ordering::Acquire) == null_mut() {
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dsb();
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// wake power-saving receivers
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sev();
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// advance
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self.pos += 1;
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// wrap
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if self.pos >= self.channel.len() {
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self.pos = 0;
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}
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// success
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None
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pub fn try_send<B: Into<Box<T>>>(&mut self, content: B) -> Result<(), B> {
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let write = self.write.load(Ordering::Relaxed);
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if (write + 1) % self.list.len() == self.read.load(Ordering::Acquire) {
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Err(content)
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} else {
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let content = unsafe { Box::from_raw(ptr) };
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// failure
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Some(content)
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let ptr = Box::into_raw(content.into());
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let entry = &self.list[write];
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let prev = entry.swap(ptr, Ordering::Relaxed);
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// we allow other end get it first
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self.write.store((write + 1) % self.list.len(), Ordering::Release);
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// wake up other core, actually I wonder if the dsb is really needed...
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dsb();
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sev();
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if !prev.is_null() {
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unsafe {
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drop_in_place(prev);
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}
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}
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Ok(())
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}
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}
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pub fn send<B: Into<Box<T>>>(&mut self, content: B) {
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let mut content = content;
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while let Err(back) = self.try_send(content) {
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content = back;
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wfe();
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}
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}
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pub async fn async_send<B: Into<Box<T>>>(&mut self, content: B) {
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struct Send<'a, T> {
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sender: &'a mut Sender<T>,
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content: Option<Box<T>>,
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struct Send<'a, 'b, T> where T: Clone, 'b: 'a {
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sender: &'a mut Sender<'b, T>,
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content: Result<(), Box<T>>,
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}
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impl<T> Future for Send<'_, T> {
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impl<T> Future for Send<'_, '_, T> where T: Clone {
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type Output = ();
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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match self.content.take() {
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Some(content) => {
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if let Some(content) = self.sender.try_send(content) {
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match core::mem::replace(&mut self.content, Ok(())) {
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Err(content) => {
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if let Err(content) = self.sender.try_send(content) {
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// failure
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self.content = Some(content);
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self.content = Err(content);
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cx.waker().wake_by_ref();
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Poll::Pending
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} else {
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@ -117,93 +77,61 @@ impl<T> Sender<T> {
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Poll::Ready(())
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}
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}
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None => panic!("Send future polled after success"),
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Ok(_) => panic!("Send future polled after success"),
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}
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}
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}
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Send {
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sender: self,
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content: Some(content.into()),
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content: Err(content.into()),
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}.await
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}
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}
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impl<'a, T> Receiver<'a, T> where T: Clone {
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pub const fn new(list: &'static [AtomicPtr<T>], write: &'static AtomicUsize, read: &'static AtomicUsize) -> Self {
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Receiver {list, write, read}
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}
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pub fn try_recv(&mut self) -> Result<T, ()> {
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let read = self.read.load(Ordering::Relaxed);
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if read == self.write.load(Ordering::Acquire) {
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Err(())
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} else {
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let entry = &self.list[read];
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let data = unsafe {
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// we cannot deallocate the box
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Box::leak(Box::from_raw(entry.load(Ordering::Relaxed)))
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};
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let result = data.clone();
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self.read.store((read + 1) % self.list.len(), Ordering::Release);
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// wake up other core, still idk if the dsb is needed...
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dsb();
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sev();
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Ok(result)
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}
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}
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/// Receiving half of a channel
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pub struct Receiver<T> {
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channel: Arc<Channel<T>>,
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pos: usize,
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}
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impl<T> Receiver<T> {
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/// Blocking receive
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pub fn recv(&mut self) -> Box<T> {
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let entry = &self.channel[self.pos];
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pub fn recv(&mut self) -> T {
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loop {
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dmb();
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let ptr = entry.swap(null_mut(), Ordering::Release);
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if ptr != null_mut() {
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dsb();
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// wake power-saving senders
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sev();
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let content = unsafe { Box::from_raw(ptr) };
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// advance
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self.pos += 1;
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// wrap
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if self.pos >= self.channel.len() {
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self.pos = 0;
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}
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return content;
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if let Ok(data) = self.try_recv() {
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return data;
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}
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// power-saving
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wfe();
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}
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}
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/// Non-blocking receive
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pub fn try_recv(&mut self) -> Option<Box<T>> {
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let entry = &self.channel[self.pos];
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dmb();
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let ptr = entry.swap(null_mut(), Ordering::Release);
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if ptr != null_mut() {
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dsb();
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// wake power-saving senders
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sev();
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let content = unsafe { Box::from_raw(ptr) };
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// advance
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self.pos += 1;
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// wrap
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if self.pos >= self.channel.len() {
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self.pos = 0;
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}
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Some(content)
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} else {
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None
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}
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}
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pub async fn async_recv(&mut self) -> Box<T> {
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struct Recv<'a, T> {
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receiver: &'a mut Receiver<T>,
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pub async fn async_recv(&mut self) -> T {
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struct Recv<'a, 'b, T> where T: Clone, 'b: 'a {
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receiver: &'a mut Receiver<'b, T>,
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}
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impl<T> Future for Recv<'_, T> {
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type Output = Box<T>;
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impl<T> Future for Recv<'_, '_, T> where T: Clone {
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type Output = T;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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if let Some(content) = self.receiver.try_recv() {
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if let Ok(content) = self.receiver.try_recv() {
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Poll::Ready(content)
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} else {
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cx.waker().wake_by_ref();
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@ -218,10 +146,26 @@ impl<T> Receiver<T> {
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}
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}
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impl<T> Iterator for Receiver<T> {
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type Item = Box<T>;
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impl<'a, T> Iterator for Receiver<'a, T> where T: Clone {
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type Item = T;
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fn next(&mut self) -> Option<Self::Item> {
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Some(self.recv())
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}
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}
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#[macro_export]
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/// Macro for initializing the sync_channel with static buffer and indexes.
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/// Note that this requires `#![feature(const_in_array_repeat_expressions)]`
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macro_rules! sync_channel {
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($t: ty, $cap: expr) => {
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{
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use core::sync::atomic::{AtomicUsize, AtomicPtr};
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use $crate::sync_channel::{Sender, Receiver};
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static LIST: [AtomicPtr<$t>; $cap + 1] = [AtomicPtr::new(core::ptr::null_mut()); $cap + 1];
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static WRITE: AtomicUsize = AtomicUsize::new(0);
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static READ: AtomicUsize = AtomicUsize::new(0);
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(Sender::new(&LIST, &WRITE, &READ), Receiver::new(&LIST, &WRITE, &READ))
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}
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};
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}
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