feat(runtime): expose JoinHandle

Author: George-Miao

compio-runtime/src/lib.rs

@@ -22,4 +22,4 @@ pub mod time;
 pub use async_task::Task;
 pub use attacher::*;
 use compio_buf::BufResult;
-pub use runtime::{spawn, spawn_blocking, submit, Runtime, RuntimeBuilder};
+pub use runtime::{spawn, spawn_blocking, submit, JoinHandle, Runtime, RuntimeBuilder};

compio-runtime/src/runtime/mod.rs

@@ -33,6 +33,8 @@ use crate::{runtime::op::OpFuture, BufResult};
 
 scoped_tls::scoped_thread_local!(static CURRENT_RUNTIME: Runtime);
 
+/// Type alias for `Task<Result<T, Box<dyn Any + Send>>>`, which resolves to an
+/// `Err` when the spawned future panicked.
 pub type JoinHandle<T> = Task<Result<T, Box<dyn Any + Send>>>;
 
 /// The async runtime of compio. It is a thread local runtime, and cannot be