Don't use signal.alarm on python2

cotyledon/__init__.py

@@ -147,7 +147,13 @@ class Service(object):
     def _terminate(self):
         signal.signal(signal.SIGTERM, signal.SIG_IGN)
         if self.graceful_shutdown_timeout > 0:
+            # NOTE(sileht): signal.alarm doesn't work well on python2
+            # use a threading timer instead
+            if sys.version_info[0] == 3:
                 signal.alarm(self.graceful_shutdown_timeout)
+            else:
+                threading.Timer(self.graceful_shutdown_timeout,
+                                self._graceful_shutdown_timeout_cb).start()
         with _exit_on_exception():
             self.terminate()
             sys.exit(0)
@@ -157,7 +163,7 @@ class Service(object):
                  'graceful exiting of service %s' % self._title)
         self._terminate()
 
-    def _graceful_shutdown_timeout_cb(self, signum, frame):
+    def _graceful_shutdown_timeout_cb(self, *args, **kwargs):
         LOG.info('Graceful shutdown timeout (%d) exceeded, exiting %s now.' %
                  (self.graceful_shutdown_timeout, self._title))
         os._exit(1)

cotyledon/tests/test_cotyledon.py

@@ -209,9 +209,6 @@ class TestCotyledon(Base):
 class TestBuggyCotyledon(Base):
     name = "buggy_app"
 
-    @unittest.skipIf(sys.version_info[0] != 3,
-                     "Buggy on py27, time.sleep returns before alarm callback "
-                     "is called")
     def test_graceful_timeout_term(self):
         lines = self.get_lines(1)
         childpid = self.get_pid(lines[0])
@@ -231,9 +228,6 @@ class TestBuggyCotyledon(Base):
             b'DEBUG:cotyledon:Shutdown finish'
         ], lines[-3:])
 
-    @unittest.skipIf(sys.version_info[0] != 3,
-                     "Buggy on py27, time.sleep returns before alarm callback "
-                     "is called")
     def test_graceful_timeout_kill(self):
         lines = self.get_lines(1)
         childpid = self.get_pid(lines[0])