BloombergLP::bdlcc::SingleProducerSingleConsumerBoundedQueue::waitUntilEmpty

Block until all the elements in this queue are removed. Return 0 on success, and a non‐zero value otherwise. Specifically, return e_SUCCESS on success, e_DISABLED if isPopFrontDisabled() and e_FAILED if an underlying mechanism returns an error. A blocked thread waiting for the queue to empty will return a non‐zero value if disablePopFront is invoked.