Fix zero-length query call for DispatchQueue::Barrier #507
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When Barrier is called with a value of zero, the return value must be set according to the number of elements in the queue as of the time of the call. Not only is this a good optimization, but it's also a way to allow consumers to easily poll the status of the queue. Fixes #504
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Fix zero-length query call for DispatchQueue::Barrier
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When Barrier is called with a value of zero, the return value must be set according to the number of elements in the queue as of the time of the call. Not only is this a good optimization, but it's also a way to allow consumers to easily poll the status of the queue.
Fixes #504