Reference Manual - 1.0.1
IDirectFBDataBuffer   WaitForDataWithTimeout

Wait for data to be available within an amount of time. Thread is idle in the meantime.
在一个时间内等待数据有效，期间线程闲置状态

WaitForDataWithTimeout (
	IDirectFBDataBuffer		*	thiz,
	unsigned int			length,
	unsigned int			seconds,
	unsigned int			milli_seconds
);

This method blocks until at least the specified number of bytes is available or the timeout is reached.
这方法将阻塞直到指定字节数有效或超时到来

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