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