Reference Manual - 1.0.1
IDirectFBDataBuffer   WaitForData

Wait for data to be available. Thread is idle in the meantime.
等待数据有效,在期间线程闲置状态

WaitForData (
  IDirectFBDataBuffer   * thiz,
  unsigned int   length
);

This method blocks until at least the specified number of bytes is available.
这方法论阻塞直到最新指定字节数有效

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