Get a pointer to the buffer at the head of the queue.
Get the number of buffers in the queue.
Get a pointer to the Nth entry in the queue (the tail corresponds to N = 1).
Get a pointer to the entry before the specified entry (closer to the tail). If the buffer specified is undefined, the head entry is returned. If the buffer specified is the tail, undefined is returned.
Optional
entry: EzspBufferThe buffer to look before.
Remove the specified entry from the queue.
A pointer to the preceding entry (if any).
Simple queue (singly-linked list)