net: use atomic-polyfill on tcp client pool, for thumbv6m support.

embassy-net/Cargo.toml

@@ -45,6 +45,7 @@ stable_deref_trait = { version = "1.2.0", default-features = false }
 futures = { version = "0.3.17", default-features = false, features = [ "async-await" ] }
 atomic-pool = "1.0"
 embedded-nal-async = { version = "0.3.0", optional = true }
+atomic-polyfill = { version = "1.0" }
 
 [dependencies.smoltcp]
 version = "0.8.0"

embassy-net/src/tcp.rs

@@ -329,8 +329,8 @@ pub mod client {
     use core::cell::UnsafeCell;
     use core::mem::MaybeUninit;
     use core::ptr::NonNull;
-    use core::sync::atomic::{AtomicBool, Ordering};
 
+    use atomic_polyfill::{AtomicBool, Ordering};
     use embedded_nal_async::IpAddr;
 
     use super::*;