moninj: sort out futures::select!

Cargo.lock

@@ -56,6 +56,81 @@ dependencies = [
  "void",
 ]
 
+[[package]]
+name = "futures"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c329ae8753502fb44ae4fc2b622fa2a94652c41e795143765ba0927f92ab780"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0c77d04ce8edd9cb903932b608268b3fffec4163dc053b3b402bf47eac1f1a8"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f25592f769825e89b92358db00d26f965761e094951ac44d3663ef25b7ac464a"
+
+[[package]]
+name = "futures-io"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a638959aa96152c7a4cddf50fcb1e3fede0583b27157c26e67d6f99904090dc6"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a5081aa3de1f7542a794a397cde100ed903b0630152d0973479018fd85423a7"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "futures-sink"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3466821b4bc114d95b087b850a724c6f83115e929bc88f1fa98a3304a944c8a6"
+
+[[package]]
+name = "futures-task"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b0a34e53cf6cdcd0178aa573aed466b646eb3db769570841fda0c7ede375a27"
+
+[[package]]
+name = "futures-util"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22766cf25d64306bedf0384da004d05c9974ab104fcc4528f1236181c18004c5"
+dependencies = [
+ "futures-core",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "pin-utils",
+ "proc-macro-hack",
+ "proc-macro-nested",
+]
+
 [[package]]
 name = "libasync"
 version = "0.0.0"
@@ -169,6 +244,18 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d659fe7c6d27f25e9d80a1a094c223f5246f6a6596453e09d7229bf42750b63"
+
+[[package]]
+name = "proc-macro-nested"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e946095f9d3ed29ec38de908c22f95d9ac008e424c7bcae54c75a79c527c694"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.10"
@@ -199,6 +286,7 @@ version = "0.1.0"
 dependencies = [
  "cslice",
  "dyld",
+ "futures",
  "libasync",
  "libboard_zynq",
  "libcortex_a9",
@@ -206,6 +294,7 @@ dependencies = [
  "log",
  "num-derive",
  "num-traits",
+ "void",
 ]
 
 [[package]]

runtime/Cargo.toml

@@ -14,6 +14,8 @@ num-traits = { version = "0.2", default-features = false }
 num-derive = "0.3"
 cslice = "0.3"
 log = "0.4"
+void = { version = "1", default-features = false }
+futures = { version = "0.3", default-features = false, features = ["async-await"] }
 libboard_zynq = { git = "https://git.m-labs.hk/M-Labs/zc706.git" }
 libsupport_zynq = { git = "https://git.m-labs.hk/M-Labs/zc706.git" }
 libcortex_a9 = { git = "https://git.m-labs.hk/M-Labs/zc706.git" }

runtime/src/comms.rs

@@ -204,7 +204,7 @@ pub fn main(timer: GlobalTimer) {
         }
     });
 
-    moninj::start();
+    moninj::start(timer);
 
     Sockets::run(&mut iface, || {
         Instant::from_millis(timer.get_time().0 as i32)

runtime/src/main.rs

@@ -1,5 +1,6 @@
 #![no_std]
 #![no_main]
+#![recursion_limit="512"]  // for futures_util::select!
 
 extern crate alloc;
 extern crate log;

runtime/src/moninj.rs

@@ -1,13 +1,14 @@
 use core::fmt;
 use alloc::collections::BTreeMap;
-use log::warn;
+use log::{debug, warn};
+use void::Void;
 
-use libboard_zynq::smoltcp;
+use libboard_zynq::{smoltcp, timer::GlobalTimer, time::Milliseconds};
-use libasync::task;
+use libasync::{task, smoltcp::TcpStream, block_async, nb};
-use libasync::smoltcp::TcpStream;
 
 use num_derive::{FromPrimitive, ToPrimitive};
 use num_traits::{FromPrimitive, ToPrimitive};
+use futures::{pin_mut, select_biased, FutureExt};
 
 use crate::proto::*;
 use crate::pl::csr;
@@ -78,16 +79,31 @@ fn read_injection_status(channel: i32, overrd: i8) -> i8 {
     }
 }
 
-async fn handle_connection(stream: &TcpStream) -> Result<()> {
+async fn handle_connection(stream: &TcpStream, timer: GlobalTimer) -> Result<()> {
     if !expect(&stream, b"ARTIQ moninj\n").await? {
         return Err(Error::UnexpectedPattern);
     }
 
     let mut probe_watch_list: BTreeMap<(i32, i8), Option<i32>> = BTreeMap::new();
     let mut inject_watch_list: BTreeMap<(i32, i8), Option<i8>> = BTreeMap::new();
-
+    let mut next_check = Milliseconds(0);
     loop {
-        let message: HostMessage = FromPrimitive::from_i8(read_i8(&stream).await?)
+        // TODO: we don't need fuse() here.
+        // remove after https://github.com/rust-lang/futures-rs/issues/1989 lands
+        let read_message_f = read_i8(&stream).fuse();
+        let next_check_c = next_check.clone();
+        let timeout = || -> nb::Result<(), Void> {
+            if timer.get_time() < next_check_c {
+                Err(nb::Error::WouldBlock)
+            } else {
+                Ok(())
+            }
+        };
+        let timeout_f = block_async!(timeout()).fuse();
+        pin_mut!(read_message_f, timeout_f);
+        select_biased! {
+            message = read_message_f => {
+                let message: HostMessage = FromPrimitive::from_i8(message?)
                     .ok_or(Error::UnrecognizedPacket)?;
                 match message {
                     HostMessage::MonitorProbe => {
@@ -96,8 +112,10 @@ async fn handle_connection(stream: &TcpStream) -> Result<()> {
                         let probe = read_i8(&stream).await?;
                         if enable {
                             let _ = probe_watch_list.entry((channel, probe)).or_insert(None);
+                            debug!("START monitoring channel {}, probe {}", channel, probe);
                         } else {
                             let _ = probe_watch_list.remove(&(channel, probe));
+                            debug!("END monitoring channel {}, probe {}", channel, probe);
                         }
                     },
                     HostMessage::MonitorInjection => {
@@ -106,8 +124,10 @@ async fn handle_connection(stream: &TcpStream) -> Result<()> {
                         let overrd = read_i8(&stream).await?;
                         if enable {
                             let _ = inject_watch_list.entry((channel, overrd)).or_insert(None);
+                            debug!("START monitoring channel {}, overrd {}", channel, overrd);
                         } else {
                             let _ = inject_watch_list.remove(&(channel, overrd));
+                            debug!("END monitoring channel {}, overrd {}", channel, overrd);
                         }
                     },
                     HostMessage::Inject => {
@@ -115,6 +135,7 @@ async fn handle_connection(stream: &TcpStream) -> Result<()> {
                         let overrd = read_i8(&stream).await?;
                         let value = read_i8(&stream).await?;
                         inject(channel, overrd, value);
+                        debug!("INJECT channel {}, overrd {}, value {}", channel, overrd, value);
                     },
                     HostMessage::GetInjectionStatus => {
                         let channel = read_i32(&stream).await?;
@@ -126,15 +147,21 @@ async fn handle_connection(stream: &TcpStream) -> Result<()> {
                         write_i8(&stream, value).await?;
                     },
                 }
+            },
+            _ = timeout_f => {
+                warn!("tick");
+                next_check = next_check + Milliseconds(200);
+            }
+        }
     }
 }
 
-pub fn start() {
+pub fn start(timer: GlobalTimer) {
     task::spawn(async move {
         loop {
             let stream = TcpStream::accept(1383, 2048, 2048).await.unwrap();
-            task::spawn(async {
+            task::spawn(async move {
-                let _ = handle_connection(&stream)
+                let _ = handle_connection(&stream, timer)
                     .await
                     .map_err(|e| warn!("connection terminated: {}", e));
                 let _ = stream.flush().await;