43 lines
919 B
Python
43 lines
919 B
Python
# test concurrent mutating access to a shared dict 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 dict
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di = {'a':'A', 'b':'B', 'c':'C', 'd':'D'}
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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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di[i] = repeat + i
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assert di[i] == repeat + i
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del di[i]
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assert i not in di
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di[i] = repeat + i
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assert di[i] == repeat + i
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assert di.pop(i) == repeat + i
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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, (30, i * 300, (i + 1) * 300))
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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 dict has correct contents
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print(sorted(di.items()))
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