AsyncQueue.lengthUnlocked

Returns the length of the queue.

Actually this function returns the number of data items in the queue minus the number of waiting threads, so a negative value means waiting threads, and a positive value means available entries in the @queue. A return value of 0 could mean n entries in the queue and n threads waiting. This can happen due to locking of the queue or due to scheduling.

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

Return: the length of the @queue.

class AsyncQueue
int
lengthUnlocked
()

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