Question: a. The TinyOS Resource interface does not allow a component that already has a request in the queue for a resource to make a second

a. The TinyOS Resource interface does not allow a component that already has a request in the queue for a resource to make a second request. Suggest a reason.
b. However, the TinyOS Resource interface allows a component holding the resource lock to re-request the lock. This request is en-queued for a later grant. Suggest a reason for this policy.

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