Add watchdog process to tramp-test36-asynchronous-requests

* test/lisp/net/tramp-tests.el (tramp--test-timeout-handler):
New defun.
(tramp-test36-asynchronous-requests): Use a watchdog process,
listening for SIGUSR1.

1 files changed, 18 insertions, 6 deletions

diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index 58639e1bfa6..4ae7b880245 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -3681,6 +3681,10 @@ Use the `ls' command."
 	  tramp-connection-properties)))
     (tramp--test-utf8)))
 
+(defun tramp--test-timeout-handler ()
+  (interactive)
+  (ert-fail (format "`%s' timed out" (ert-test-name (ert-running-test)))))
+
 ;; This test is inspired by Bug#16928.
 (ert-deftest tramp-test36-asynchronous-requests ()
   "Check parallel asynchronous requests.
@@ -3690,10 +3694,15 @@ process sentinels.  They shall not disturb each other."
   (skip-unless (tramp--test-enabled))
   (skip-unless (tramp--test-sh-p))
 
-  ;; This test could be blocked on hydra.
-  (with-timeout
-      (300 (ert-fail "`tramp-test36-asynchronous-requests' timed out"))
-    (let* ((tmp-name (tramp--test-make-temp-name))
+  ;; This test could be blocked on hydra.  So we set a timeout of 300
+  ;; seconds, and we send a SIGUSR1 signal after 300 seconds.
+  (with-timeout (300 (tramp--test-timeout-handler))
+    (define-key special-event-map [sigusr1] 'tramp--test-timeout-handler)
+    (let* ((watchdog
+            (start-process
+             "*watchdog*" nil shell-file-name shell-command-switch
+             (format "sleep 300; kill -USR1 %d" (emacs-pid))))
+           (tmp-name (tramp--test-make-temp-name))
            (default-directory tmp-name)
            ;; Do not cache Tramp properties.
            (remote-file-name-inhibit-cache t)
@@ -3806,6 +3815,8 @@ process sentinels.  They shall not disturb each other."
                   ;; Regular operation.
                   (tramp--test-message
                    "Trace 3 action %d %s %s" count buf (current-time-string))
+                  ;; Give the watchdog a chance.
+                  (read-event nil nil 0.01)
                   (if (= count 2)
                       (if (= (length buffers) 1)
                           (tramp--test-instrument-test-case 10
@@ -3821,8 +3832,7 @@ process sentinels.  They shall not disturb each other."
             ;; Checks.  All process output shall exists in the
             ;; respective buffers.  All created files shall be
             ;; deleted.
-            (tramp--test-message
-             "Check %s" (current-time-string))
+            (tramp--test-message "Check %s" (current-time-string))
             (dolist (buf buffers)
               (with-current-buffer buf
                 (should (string-equal (format "%s\n" buf) (buffer-string)))))
@@ -3831,6 +3841,8 @@ process sentinels.  They shall not disturb each other."
               tmp-name nil directory-files-no-dot-files-regexp)))
 
         ;; Cleanup.
+        (define-key special-event-map [sigusr1] 'ignore)
+        (ignore-errors (quit-process watchdog))
         (dolist (buf buffers)
           (ignore-errors (delete-process (get-buffer-process buf)))
           (ignore-errors (kill-buffer buf)))