You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/wasmer/lib/wasix/src/runtime/task_manager
    
    the code of the file until where you have to start completion: // TODO: should be behind a different , tokio specific feature flag.
#[cfg(feature = "sys-th
    
            fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
                let work = self.trigger.as_mut();
                Poll::Ready(if let Poll::Ready(res) = work.poll(cx) {
                    Ok(res)
                } else if let Some(forced_exit) = self.thread.try_join() {
                    return Poll::Ready(Err(forced_exit.unwrap_or_else(|err| {
                        tracing::debug!("exit runtime error - {}", err);
                        Errno::Child.into()
                    })));
                } else {
                    return Poll::Pending;
                })
            }