python · vstinner · Jul 12, 2018 · Jul 12, 2018
diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
@@ -529,19 +529,24 @@ def test_thread_time(self):
        # on Windows
        self.assertLess(stop - start, 0.020)

+        # bpo-33723: A busy loop of 100 ms should increase thread_time()
+        # by at least 15 ms
+        min_time = 0.015
+        busy_time = 0.100
+
        # thread_time() should include CPU time spent in current thread...
        start = time.thread_time()
-        busy_wait(0.100)
+        busy_wait(busy_time)
        stop = time.thread_time()
-        self.assertGreaterEqual(stop - start, 0.020)  # machine busy?
+        self.assertGreaterEqual(stop - start, min_time)

        # ...but not in other threads
-        t = threading.Thread(target=busy_wait, args=(0.100,))
+        t = threading.Thread(target=busy_wait, args=(busy_time,))
        start = time.thread_time()
        t.start()
        t.join()
        stop = time.thread_time()
-        self.assertLess(stop - start, 0.020)
+        self.assertLess(stop - start, min_time)

        info = time.get_clock_info('thread_time')
        self.assertTrue(info.monotonic)