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@ -164,6 +164,14 @@ class Linearizer(object):
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@defer.inlineCallbacks
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def queue(self, key):
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# If there is already a deferred in the queue, we pull it out so that
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# we can wait on it later.
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# Then we replace it with a deferred that we resolve *after* the
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# context manager has exited.
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# We only return the context manager after the previous deferred has
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# resolved.
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# This all has the net effect of creating a chain of deferreds that
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# wait for the previous deferred before starting their work.
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current_defer = self.key_to_defer.get(key)
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new_defer = defer.Deferred()
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