Reference Manual - 1.0.1
IDirectFB   SetCooperativeLevel

Puts the interface into the specified cooperative level.放置接口到具体的合作层

SetCooperativeLevel (
	IDirectFB		*	thiz,
	DFBCooperativeLevel			level
);

Function fails with DFB_LOCKED if another instance already is in a cooperative level other than DFSCL_NORMAL.

函数调钭产生 DFB_LOCKED失败，如果有别的实例已经应用在协助层上，除了DFSCL_NORMAL

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