54 lines
1.1 KiB
Python
54 lines
1.1 KiB
Python
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# Threads should be semi-cooperative, to the point where one busy
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# thread can't starve out another.
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#
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# (Note on ports without the GIL this one should always be true, on ports with GIL it's
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# a test of the GIL behaviour.)
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import _thread
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import sys
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from time import ticks_ms, ticks_diff, sleep_ms
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done = False
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ITERATIONS = 5
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SLEEP_MS = 250
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MAX_DELTA = 30
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if sys.platform in ("win32", "linux", "darwin"):
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# Conventional operating systems get looser timing restrictions
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SLEEP_MS = 300
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MAX_DELTA = 100
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def busy_thread():
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while not done:
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pass
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def test_sleeps():
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global done
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ok = True
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for _ in range(ITERATIONS):
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t0 = ticks_ms()
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sleep_ms(SLEEP_MS)
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t1 = ticks_ms()
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d = ticks_diff(t1, t0)
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if d < SLEEP_MS - MAX_DELTA or d > SLEEP_MS + MAX_DELTA:
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print("Slept too long ", d)
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ok = False
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print("OK" if ok else "Not OK")
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done = True
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# make the thread the busy one, and check sleep time on main task
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_thread.start_new_thread(busy_thread, ())
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test_sleeps()
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sleep_ms(100)
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done = False
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# now swap them
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_thread.start_new_thread(test_sleeps, ())
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busy_thread()
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