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One thread May have multiple lock/wait/signal source: Input : signal source from input. Output : signal source from output. Control: signal source from async control operation. Then the main working loop may stop on these lock/wait/signal points. Change-Id: Ia6270b865cfb7087567fc21f07feb9248b929d7a Signed-off-by: Herman Chen <herman.chen@rock-chips.com>