fdclosor: assign name to thread

src/utils/fdcloser.rs

@@ -16,7 +16,9 @@ impl FdCloser {
             cv: Condvar::new(),
         });
         let slf2 = slf.clone();
-        std::thread::spawn(move || {
+        std::thread::Builder::new()
+            .name("fd closer".to_string())
+            .spawn(move || {
                 let mut fds = vec![];
                 let mut lock = slf2.fds.lock();
                 loop {
@@ -29,7 +31,8 @@ impl FdCloser {
                         slf2.cv.wait(&mut lock);
                     }
                 }
-        });
+            })
+            .unwrap();
         slf
     }