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# test capability for threads to access a shared immutable data structure
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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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def foo(i):
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pass
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def thread_entry(n, tup):
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for i in tup:
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foo(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 = 2
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n_finished = 0
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# the shared data structure
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tup = (1, 2, 3, 4)
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# spawn threads
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for i in range(n_thread):
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_thread.start_new_thread(thread_entry, (100, tup))
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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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print(tup)
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