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52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
import threading
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import time
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import traceback
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from numpy.testing import assert_
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from pytest import raises as assert_raises
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from scipy._lib._threadsafety import ReentrancyLock, non_reentrant, ReentrancyError
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def test_parallel_threads():
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# Check that ReentrancyLock serializes work in parallel threads.
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#
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# The test is not fully deterministic, and may succeed falsely if
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# the timings go wrong.
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lock = ReentrancyLock("failure")
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failflag = [False]
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exceptions_raised = []
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def worker(k):
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try:
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with lock:
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assert_(not failflag[0])
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failflag[0] = True
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time.sleep(0.1 * k)
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assert_(failflag[0])
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failflag[0] = False
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except Exception:
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exceptions_raised.append(traceback.format_exc(2))
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threads = [threading.Thread(target=lambda k=k: worker(k))
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for k in range(3)]
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for t in threads:
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t.start()
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for t in threads:
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t.join()
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exceptions_raised = "\n".join(exceptions_raised)
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assert_(not exceptions_raised, exceptions_raised)
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def test_reentering():
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# Check that ReentrancyLock prevents re-entering from the same thread.
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@non_reentrant()
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def func(x):
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return func(x)
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assert_raises(ReentrancyError, func, 0)
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