add chrono for benchmarking

src/worker/mod.rs

@@ -1,3 +1,3 @@
 mod worker;
 
-pub use worker::{Manager, Queue};
+pub use worker::{Manager, Queue, WorkerStatus};

src/worker/worker.rs

@@ -106,8 +106,7 @@ impl<T: Runner + std::marker::Send + 'static> Manager<T> {
         self.queue.not_empty.notify_one();
     }
 
-    #[allow(dead_code)]
-    fn healthcheck(&self, target: WorkerStatus) -> bool {
+    pub fn healthcheck(&self, target: WorkerStatus) -> bool {
         for w in &self.workers {
             if w.lock().unwrap().get_status() != target {
                 return false;