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Fix a memory leak in QueueHandler #134
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`QueueHandler` sometimes retains the context it is executing on in `waitingCtx`. That context's handler is the `QueueHandler` itself, leading to a retain cycle. We break it by making `waitingCtx` a weak reference.
tanner0101
approved these changes
Apr 21, 2018
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QueueHandlersometimes retains the context it is executing on inwaitingCtx. That context's handler is theQueueHandleritself, leading to a retain cycle. We break it by makingwaitingCtxa weak reference.