On 2013-06-26 12:07, Rosa, Andrea (HP Cloud Services) wrote:
Hi all,
What happens if a greenthread, after acquiring a lock (not external),
it dies?
For example:
A thread is performing the "do_terminate_instance", it has the lock
and before terminating the process it dies, what happens at the lock?
Is that released in some way?
That function is using the synchronized decorator, which means that it's
wrapped by a semaphore context. As I understand it (and someone correct
me if I'm wrong), if an error happens and an exception is thrown the
context would be exited and the semaphore released. Of course, I
suppose there are situations where a thread could be terminated without
being able to do that cleanup, but I suspect most of those cases would
kill the entire process, making the lock irrelevant (since you specify
not external).
If not I think that all other actions for that instance are blocked
waiting for the lock, is that correct?
That is a potential pitfall of synchronization, but I think it shouldn't
happen in this case. Are you seeing this behavior?
-Ben
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