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39 return 0, nil, true44 return 0, nil, false49 if err != nil {61 if err != nil {65 if err := c.writeLock(); err != nil {84 if n == 0 && err1 == nil {88 if err1 = c.pd.WaitWrite(); err1 == nil {95 if err1 != nil {103 if lr != nil {106 if err != nil {