bpo-30490: Allow to the Event.set method pass an exception #1824
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Having the Event as the way to synchronize 1:N coroutines, the none happy path should be able to be expressed making possible call the
set_exception
for each future related to each waiter.As an example the following code trying to implement a way to avoid the dogpile effect for a DNS cache. If the coro that holds the event fails, the original exception is also broadcasted to the waiters.