Switch from tokio.rs to async_std

Cargo.toml

@@ -20,7 +20,8 @@ uuid = { version = "0.8", features = ["v4"] }
 anyhow = "1.0"
 clap = "3.0.0-beta.2"
 lazy_static = "1.4"
-tokio = { version = "1.7", features = ["rt-multi-thread", "macros", "sync", "net", "time", "io-util"] }
+tokio = { version = "1.7", features = ["macros", "net"] }
+async-std = { version = "^1.0", features = ["attributes", "unstable"] }
 wasmtime = { version = "0.29", git = "https://github.com/bytecodealliance/wasmtime.git", branch = "main" }
 wasmtime-wasi = { version = "0.29", git = "https://github.com/bytecodealliance/wasmtime.git", branch = "main" }
 wasmparser = "0.79"
@@ -34,6 +35,7 @@ semver = "1"
 wat = "1.0"
 wabt = "0.10"
 pretty_assertions = "0.7"
+tokio = { version = "1.7", features = ["rt-multi-thread"] }
 criterion = { version = "0.3", features = ["async_tokio"] }
 
 [build-dependencies]

benches/benchmark.rs

@@ -14,7 +14,12 @@ fn criterion_benchmark(c: &mut Criterion) {
 
     c.bench_function("spawn process", |b| {
         b.to_async(&rt).iter(|| async {
-            module.spawn("hello", Vec::new(), None).await.unwrap();
+            module
+                .spawn("hello", Vec::new(), None)
+                .await
+                .unwrap()
+                .0
+                .await;
         });
     });
 

src/api/mailbox.rs

@@ -511,7 +511,7 @@ fn send_receive_skip_search(
             .or_trap("lunatic::message::send_receive_skip_search")?;
         process.send(Signal::Message(message));
         if let Some(message) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             message = caller.data_mut().message_mailbox.pop_skip_search(tag) => Some(message)
         } {
             // Put the message into the scratch area
@@ -550,7 +550,7 @@ fn receive(
             tag => Some(tag),
         };
         if let Some(message) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             message = caller.data_mut().message_mailbox.pop(tag) => Some(message)
         } {
             let result = match message {

src/api/mod.rs

@@ -75,7 +75,7 @@ fn namespace_matches_filter(namespace: &str, name: &str, namespace_filter: &[Str
 }
 
 mod tests {
-    #[tokio::test]
+    #[async_std::test]
     async fn import_filter_signature_matches() {
         use crate::{EnvConfig, Environment};
 

src/api/networking.rs

@@ -2,13 +2,11 @@ use std::convert::TryInto;
 use std::future::Future;
 use std::io::IoSlice;
 use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
-use std::sync::Arc;
 use std::time::Duration;
 
 use anyhow::Result;
-use tokio::io::{AsyncReadExt, AsyncWriteExt};
-use tokio::net::{TcpListener, TcpStream};
-use tokio::sync::Mutex;
+use async_std::io::{ReadExt, WriteExt};
+use async_std::net::{TcpListener, TcpStream};
 use wasmtime::{Caller, FuncType, Linker, ValType};
 use wasmtime::{Memory, Trap};
 
@@ -211,7 +209,7 @@ fn resolve(
         let name = std::str::from_utf8(buffer.as_slice()).or_trap("lunatic::network::resolve")?;
         // Check for timeout during lookup
         let return_ = if let Some(result) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             result = tokio::net::lookup_host(name) => Some(result)
         } {
             let (iter_or_error_id, result) = match result {
@@ -463,11 +461,7 @@ fn tcp_accept(
 
         let (tcp_stream_or_error_id, peer_addr_iter, result) = match tcp_listener.accept().await {
             Ok((stream, socket_addr)) => {
-                let stream_id = caller
-                    .data_mut()
-                    .resources
-                    .tcp_streams
-                    .add(Arc::new(Mutex::new(stream)));
+                let stream_id = caller.data_mut().resources.tcp_streams.add(stream);
                 let dns_iter_id = caller
                     .data_mut()
                     .resources
@@ -539,18 +533,11 @@ fn tcp_connect(
         )?;
 
         if let Some(result) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             result = TcpStream::connect(socket_addr) => Some(result)
         } {
             let (stream_or_error_id, result) = match result {
-                Ok(stream) => (
-                    caller
-                        .data_mut()
-                        .resources
-                        .tcp_streams
-                        .add(Arc::new(Mutex::new(stream))),
-                    0,
-                ),
+                Ok(stream) => (caller.data_mut().resources.tcp_streams.add(stream), 0),
                 Err(error) => (caller.data_mut().errors.add(error.into()), 1),
             };
 
@@ -660,17 +647,17 @@ fn tcp_write_vectored(
             .collect();
         let vec_slices = vec_slices?;
 
-        let stream_mutex = caller
+        let mut stream = caller
             .data()
             .resources
             .tcp_streams
             .get(stream_id)
             .or_trap("lunatic::network::tcp_write_vectored")?
             .clone();
-        let mut stream = stream_mutex.lock().await;
+
         // Check for timeout
         if let Some(result) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             result = stream.write_vectored(vec_slices.as_slice()) => Some(result)
         } {
             let (opaque, return_) = match result {
@@ -722,16 +709,14 @@ fn tcp_read(
     opaque_ptr: u32,
 ) -> Box<dyn Future<Output = Result<u32, Trap>> + Send + '_> {
     Box::new(async move {
-        let stream_mutex = caller
+        let mut stream = caller
             .data()
             .resources
             .tcp_streams
             .get(stream_id)
             .or_trap("lunatic::network::tcp_read")?
             .clone();
 
-        let mut stream = stream_mutex.lock().await;
-
         let memory = get_memory(&mut caller)?;
         let buffer = memory
             .data_mut(&mut caller)
@@ -740,7 +725,7 @@ fn tcp_read(
 
         // Check for timeout first
         if let Some(result) = tokio::select! {
-            _ = tokio::time::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
+            _ = async_std::task::sleep(Duration::from_millis(timeout as u64)), if timeout != 0 => None,
             result = stream.read(buffer) => Some(result)
         } {
             let (opaque, return_) = match result {
@@ -783,14 +768,13 @@ fn tcp_flush(
     error_id_ptr: u32,
 ) -> Box<dyn Future<Output = Result<u32, Trap>> + Send + '_> {
     Box::new(async move {
-        let stream_mutex = caller
+        let mut stream = caller
             .data()
             .resources
             .tcp_streams
             .get(stream_id)
             .or_trap("lunatic::network::tcp_flush")?
             .clone();
-        let mut stream = stream_mutex.lock().await;
 
         let (error_id, result) = match stream.flush().await {
             Ok(()) => (0, 0),

src/api/process.rs

@@ -754,7 +754,7 @@ fn clone_process(mut caller: Caller<ProcessState>, process_id: u64) -> Result<u6
 //% Suspend process for `millis`.
 fn sleep_ms(_: Caller<ProcessState>, millis: u64) -> Box<dyn Future<Output = ()> + Send + '_> {
     Box::new(async move {
-        tokio::time::sleep(Duration::from_millis(millis)).await;
+        async_std::task::sleep(Duration::from_millis(millis)).await;
     })
 }
 
@@ -771,7 +771,7 @@ fn die_when_link_dies(mut caller: Caller<ProcessState>, trap: u32) {
     caller
         .data_mut()
         .signal_mailbox
-        .send(Signal::DieWhenLinkDies(trap != 0))
+        .try_send(Signal::DieWhenLinkDies(trap != 0))
         .expect("The signal is sent to itself and the receiver must exist at this point");
 }
 
@@ -847,7 +847,7 @@ fn link(mut caller: Caller<ProcessState>, tag: i64, process_id: u64) -> Result<(
     caller
         .data_mut()
         .signal_mailbox
-        .send(Signal::Link(tag, process))
+        .try_send(Signal::Link(tag, process))
         .expect("The signal is sent to itself and the receiver must exist at this point");
     Ok(())
 }
@@ -878,7 +878,7 @@ fn unlink(mut caller: Caller<ProcessState>, process_id: u64) -> Result<(), Trap>
     caller
         .data_mut()
         .signal_mailbox
-        .send(Signal::UnLink(process))
+        .try_send(Signal::UnLink(process))
         .expect("The signal is sent to itself and the receiver must exist at this point");
     Ok(())
 }

src/environment.rs

@@ -1,6 +1,5 @@
 use anyhow::Result;
 use lazy_static::lazy_static;
-use tokio::task;
 use wasmtime::{Config, Engine, InstanceAllocationStrategy, Linker, OptLevel, ProfilingStrategy};
 
 use super::config::EnvConfig;
@@ -77,13 +76,13 @@ impl Environment {
         let env = self.clone();
         let new_module = patch_module(&data, self.config.plugins())?;
         // The compilation of a module is a CPU intensive tasks and can take some time.
-        let module = task::spawn_blocking(move || {
+        let module = async_std::task::spawn_blocking(move || {
             match wasmtime::Module::new(env.engine(), new_module.as_slice()) {
                 Ok(wasmtime_module) => Ok(Module::new(data, env, wasmtime_module)),
                 Err(err) => Err(err),
             }
         })
-        .await??;
+        .await?;
         Ok(module)
     }
 

src/mailbox.rs

@@ -151,7 +151,7 @@ mod tests {
 
     use super::{Message, MessageMailbox};
 
-    #[tokio::test]
+    #[async_std::test]
     async fn no_tag_signal_message() {
         let mailbox = MessageMailbox::default();
         let message = Message::Signal(None);
@@ -163,7 +163,7 @@ mod tests {
         }
     }
 
-    #[tokio::test]
+    #[async_std::test]
     async fn tag_signal_message() {
         let mailbox = MessageMailbox::default();
         let tag = Some(1337);
@@ -173,7 +173,7 @@ mod tests {
         assert_eq!(message.tag(), tag);
     }
 
-    #[tokio::test]
+    #[async_std::test]
     async fn selective_receive_tag_signal_message() {
         let mailbox = MessageMailbox::default();
         let tag1 = Some(1);

src/main.rs

@@ -5,7 +5,8 @@ use clap::{crate_version, App, Arg, ArgSettings};
 use anyhow::{Context, Result};
 use lunatic_runtime::{EnvConfig, Environment};
 
-fn main() -> Result<()> {
+#[async_std::main]
+async fn main() -> Result<()> {
     // Init logger
     env_logger::init();
     // Parse command line arguments
@@ -60,25 +61,19 @@ fn main() -> Result<()> {
     }
     let env = Environment::new(config)?;
 
-    let rt = tokio::runtime::Builder::new_multi_thread()
-        .enable_all()
-        .build()?;
-
-    rt.block_on(async {
-        // Spawn main process
-        let path = args.value_of("wasm").unwrap();
-        let path = Path::new(path);
-        let module = fs::read(path)?;
-        let module = env.create_module(module).await?;
-        let (task, _) = module
-            .spawn("_start", Vec::new(), None)
-            .await
-            .context(format!(
-                "Failed to spawn process from {}::_start()",
-                path.to_string_lossy()
-            ))?;
-        // Wait on the main process to finish
-        task.await?;
-        Ok(())
-    })
+    // Spawn main process
+    let path = args.value_of("wasm").unwrap();
+    let path = Path::new(path);
+    let module = fs::read(path)?;
+    let module = env.create_module(module).await?;
+    let (task, _) = module
+        .spawn("_start", Vec::new(), None)
+        .await
+        .context(format!(
+            "Failed to spawn process from {}::_start()",
+            path.to_string_lossy()
+        ))?;
+    // Wait on the main process to finish
+    task.await;
+    Ok(())
 }

src/message.rs

@@ -10,7 +10,7 @@ use std::{
     sync::Arc,
 };
 
-use tokio::{net::TcpStream, sync::Mutex};
+use async_std::net::TcpStream;
 
 use crate::Process;
 
@@ -65,7 +65,7 @@ impl DataMessage {
     }
 
     /// Adds a TCP stream to the message and returns the index of it inside of the message
-    pub fn add_tcp_stream(&mut self, tcp_stream: Arc<Mutex<TcpStream>>) -> usize {
+    pub fn add_tcp_stream(&mut self, tcp_stream: TcpStream) -> usize {
         self.resources.push(Resource::TcpStream(tcp_stream));
         self.resources.len() - 1
     }
@@ -94,7 +94,7 @@ impl DataMessage {
     ///
     /// If the index is out of bound or the resource is not a tcp stream the function will return
     /// None.
-    pub fn take_tcp_stream(&mut self, index: usize) -> Option<Arc<Mutex<TcpStream>>> {
+    pub fn take_tcp_stream(&mut self, index: usize) -> Option<TcpStream> {
         if let Some(resource_ref) = self.resources.get_mut(index) {
             let resource = std::mem::replace(resource_ref, Resource::None);
             match resource {
@@ -147,12 +147,12 @@ impl Read for DataMessage {
     }
 }
 
-/// A resource ([`WasmProcess`](crate::WasmProcess), [`TcpStream`](tokio::net::TcpStream),
+/// A resource ([`WasmProcess`](crate::WasmProcess), [`TcpStream`](async_std::net::TcpStream),
 /// ...) that is attached to a [`DataMessage`].
 pub enum Resource {
     None,
     Process(Arc<dyn Process>),
-    TcpStream(Arc<Mutex<TcpStream>>),
+    TcpStream(TcpStream),
 }
 
 impl Debug for Resource {