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46 lines
1.1 KiB
46 lines
1.1 KiB
# test concurrent mutating access to a shared user instance
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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 user class and instance
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class User:
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def __init__(self):
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self.a = "A"
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self.b = "B"
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self.c = "C"
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user = User()
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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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setattr(user, "attr_%u" % i, repeat + i)
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assert getattr(user, "attr_%u" % 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_repeat = 30
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n_range = 50 # 300 for stressful test (uses more heap)
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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, (n_repeat, i * n_range, (i + 1) * n_range))
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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 user instance has correct contents
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print(user.a, user.b, user.c)
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for i in range(n_thread * n_range):
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assert getattr(user, "attr_%u" % i) == n_repeat - 1 + i
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