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bpo-33723: Fix test_time.test_thread_time() #8267

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Merged
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Jul 12, 2018
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bpo-33723: Fix test_time.test_thread_time() #8267

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13 changes: 9 additions & 4 deletions Lib/test/test_time.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
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