fix: TimerFuture being Send and Sync (#470)

* fix: TimerFuture being Send and Sync

* fix: ci

Author: George-Miao

compio-runtime/src/lib.rs

@@ -27,3 +27,27 @@ pub use runtime::{
     BorrowedBuffer, BufferPool, JoinHandle, Runtime, RuntimeBuilder, spawn, spawn_blocking, submit,
     submit_with_flags,
 };
+
+/// Macro that asserts a type *DOES NOT* implement some trait. Shamelessly
+/// copied from <https://users.rust-lang.org/t/a-macro-to-assert-that-a-type-does-not-implement-trait-bounds/31179>.
+///
+/// # Example
+///
+/// ```rust,ignore
+/// assert_not_impl!(u8, From<u16>);
+/// ```
+macro_rules! assert_not_impl {
+    ($x:ty, $($t:path),+ $(,)*) => {
+        const _: fn() -> () = || {
+            struct Check<T: ?Sized>(T);
+            trait AmbiguousIfImpl<A> { fn some_item() { } }
+
+            impl<T: ?Sized> AmbiguousIfImpl<()> for Check<T> { }
+            impl<T: ?Sized $(+ $t)*> AmbiguousIfImpl<u8> for Check<T> { }
+
+            <Check::<$x> as AmbiguousIfImpl<_>>::some_item()
+        };
+    };
+}
+
+use assert_not_impl;

compio-runtime/src/runtime/time.rs

@@ -2,6 +2,7 @@ use std::{
     cmp::Reverse,
     collections::BinaryHeap,
     future::Future,
+    marker::PhantomData,
     pin::Pin,
     task::{Context, Poll, Waker},
     time::{Duration, Instant},
@@ -125,11 +126,15 @@ impl TimerRuntime {
 
 pub struct TimerFuture {
     key: usize,
+    _local_marker: PhantomData<*const ()>,
 }
 
 impl TimerFuture {
     pub fn new(key: usize) -> Self {
-        Self { key }
+        Self {
+            key,
+            _local_marker: PhantomData,
+        }
     }
 }
 
@@ -147,6 +152,8 @@ impl Drop for TimerFuture {
     }
 }
 
+crate::assert_not_impl!(TimerFuture, Send, Sync);
+
 #[test]
 fn timer_min_timeout() {
     let mut runtime = TimerRuntime::new();