TN3270 Server Can Incorrectly Terminate a Session

CAUSE

Occasionally, the TN3270 Server can process an RUI_READ completion before the verb has actually completed.

The RUI event completion code in the TN3270 Server leaves open timing windows where either of these two events might happen:

• If an RUI_READ and RUI_WRITE are outstanding and the RUI_READ completes, the TN3270 Server might act as if the RUI_WRITE has completed.
  
  -or-
• If an RUI_READ and RUI_WRITE are outstanding and the RUI_WRITE completes, the TN3270 Server might act as if the RUI_READ has completed.

In either case, the TN3270 Server can examine the RUI verb control block at the same time the RUI library is filling in the verb control block.