timeout_pop_unlocked

Pops data from the this.

If the queue is empty, blocks for timeout microseconds, or until data becomes available.

If no data is received before the timeout, null is returned.

This function must be called while holding the this's lock.

Parameters:

this	a AsyncQueue
timeout	the number of microseconds to wait

Returns:

data from the queue or null, when no data is received before the timeout.