Enable "wait_until_true" when used ouf the main thread

"util.wait_until_true" uses "util.Timer" to create an active wait for a
condition. "Timer" class uses "signal" to create a watchdog to track the
time lapsed.

When used out of the main thread, "Timer" raises the following error:
  ValueError: signal only works in main thread

To make "util.wait_until_true" usable always, a new waitting method is
implemented.

JIRA: YARDSTICK-1358

Change-Id: Ifb5ba0b17b5beca0af5ceab4f6431d58b7928762
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/yardstick/tests/unit/common/test_utils.py b/yardstick/tests/unit/common/test_utils.py
index bf0b5181a..7c58a8243 100644
--- a/yardstick/tests/unit/common/test_utils.py
+++ b/yardstick/tests/unit/common/test_utils.py
@@ -12,12 +12,14 @@ import errno
 import importlib
 import ipaddress
 from itertools import product, chain
-import mock
 import os
-import six
-from six.moves import configparser
 import socket
 import time
+import threading
+
+import mock
+import six
+from six.moves import configparser
 import unittest
 
 import yardstick
@@ -1277,6 +1279,10 @@ class TimerTestCase(ut_base.BaseUnitTestCase):
             time.sleep(1.1)
         self.assertEqual(2, len(iterations))
 
+    def test_delta_time_sec(self):
+        with utils.Timer() as timer:
+            self.assertIsInstance(timer.delta_time_sec(), float)
+
 
 class WaitUntilTrueTestCase(ut_base.BaseUnitTestCase):
 
@@ -1298,6 +1304,15 @@ class WaitUntilTrueTestCase(ut_base.BaseUnitTestCase):
                 utils.wait_until_true(lambda: False, timeout=1, sleep=1,
                                       exception=MyTimeoutException))
 
+    def _run_thread(self):
+        with self.assertRaises(exceptions.WaitTimeout):
+            utils.wait_until_true(lambda: False, timeout=1, sleep=1)
+
+    def test_timeout_no_main_thread(self):
+        new_thread = threading.Thread(target=self._run_thread)
+        new_thread.start()
+        new_thread.join(timeout=3)
+
 
 class SendSocketCommandTestCase(unittest.TestCase):