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37 lines
760 B
37 lines
760 B
# test concurrent mutating access to a shared set object
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#
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# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
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import _thread
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# the shared set
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se = set([-1, -2, -3, -4])
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# main thread function
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def th(n, lo, hi):
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for repeat in range(n):
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for i in range(lo, hi):
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se.add(i)
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assert i in se
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se.remove(i)
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assert i not in se
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with lock:
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global n_finished
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n_finished += 1
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lock = _thread.allocate_lock()
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n_thread = 4
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n_finished = 0
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# spawn threads
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for i in range(n_thread):
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_thread.start_new_thread(th, (50, i * 500, (i + 1) * 500))
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# busy wait for threads to finish
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while n_finished < n_thread:
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pass
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# check set has correct contents
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print(sorted(se))
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