Slightly improve blocking code, add info to resync worker

src/block/manager.rs

@@ -728,6 +728,23 @@ impl Worker for ResyncWorker {
 		"Block resync worker".into()
 	}
 
+	fn info(&self) -> Option<String> {
+		let mut ret = vec![];
+		let qlen = self.manager.resync_queue_len().unwrap_or(0);
+		let elen = self.manager.resync_errors_len().unwrap_or(0);
+		if qlen > 0 {
+			ret.push(format!("{} blocks in queue", qlen));
+		}
+		if elen > 0 {
+			ret.push(format!("{} blocks in error state", elen));
+		}
+		if ret.len() > 0 {
+			Some(ret.join(", "))
+		} else {
+			None
+		}
+	}
+
 	async fn work(
 		&mut self,
 		_must_exit: &mut watch::Receiver<bool>,

src/table/merkle.rs

@@ -326,7 +326,18 @@ where
 		&mut self,
 		_must_exit: &mut watch::Receiver<bool>,
 	) -> Result<WorkerStatus, Error> {
-		self.0.updater_loop_iter()
+		let updater = self.0.clone();
+		tokio::task::spawn_blocking(move || {
+			for _i in 0..100 {
+				let s = updater.updater_loop_iter();
+				if !matches!(s, Ok(WorkerStatus::Busy)) {
+					return s;
+				}
+			}
+			Ok(WorkerStatus::Busy)
+		})
+		.await
+		.unwrap()
 	}
 
 	async fn wait_for_work(&mut self, must_exit: &watch::Receiver<bool>) -> WorkerStatus {