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//! Macro for ring-core
//!
//! `poll` schedules a future expression repeatedly on wasm runtimes.
//!
//! # Example
//!
//! ```rust,ignore
//! # extern crate async_trait;
//! # extern crate futures;
//! # extern crate ring_core;
//! # extern crate log;
//!
//! use std::sync::Arc;
//! use std::time::Duration;
//!
//! # use async_trait::async_trait;
//! # use futures::future::FutureExt;
//! # use futures::pin_mut;
//! # use futures::select;
//! # use futures_timer::Delay;
//! # use ring_core::dht::Stabilization;
//! # use ring_core::dht::TStabilize;
//!
//! #[async_trait]
//! impl TStabilize for Stabilization {
//! async fn wait(self: Arc<Self>) {
//! loop {
//! let timeout = Delay::new(Duration::from_secs(self.timeout as u64)).fuse();
//! pin_mut!(timeout);
//! select! {
//! _ = timeout => self
//! .stabilize()
//! .await
//! .unwrap_or_else(|e| log::error!("failed to stabilize {:?}", e)),
//! }
//! }
//! }
//! }
//! ```
//!
//! Stabilize function using `futures::select` to await task is finish, but feature wasm not support
//! Using `poll` can fix this problem.
//!
//! ```rust,ignore
//! # extern crate async_trait;
//! # extern crate ring_core;
//! # extern crate log;
//!
//! # use std::sync::Arc;
//!
//! # use async_trait::async_trait;
//! # use ring_core::dht::Stabilization;
//! # use ring_core::dht::TStabilize;
//! # use ring_core::poll;
//! #[async_trait(?Send)]
//! impl TStabilize for Stabilization {
//! async fn wait(self: Arc<Self>) {
//! let caller = Arc::clone(&self);
//! poll!(
//! {
//! let caller = Arc::clone(&caller);
//! async move {
//! caller
//! .stabilize()
//! .await
//! .unwrap_or_else(|e| log::error!("failed to stabilize {:?}", e));
//! }
//! },
//! 25000
//! );
//! }
//! }
//! ```
/// Schedule a future expression repeatedly with a wasm timeout.