Urgent Data Transmission (3)


Some limitation of the urgent data design.
TCP only knows the endpoint of the urgent data.
TCP does not know the start point of the urgent data or the length of the urgent data.
TCP only knows if application has finished to read the urgent data.
TCP does not know if application is reading urgent data.
When consecutive urgent data is sent to the receiver...
The urgent pointer is overwritten whether application has finished to read first data or not. 
Receiver can not have multiple urgent data at the same time.