[issue27468] Erroneous memory behaviour for objects created in another thread

[Peter Otten]

Peter Otten added the comment:

Your code relies on the assumption that when the lambda is invoked the global t is still bound to the Thread instance you are starting. It seems that this is not always the case, and I don't see why it should be guaranteed either.
I don't know whether it's a good idea to store per-thread data in the Thread instance (have a look at threading.local()), but

def start_thread():
    t = Thread(target=lambda: f(t))
    t.obj = [0]
    t.start()

for _ in range(n_threads):
    start_thread()

will at least avoid the global.

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nosy: +peter.otten

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<http://bugs.python.org/issue27468>
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