Ensure that the VC sender-loop waits for a synchronization event to terminate.

[khibino]

After TCP53 or DoT query, if you look at the state of the sender thread, you will see that it is ThreadBlocked and is still waiting.

monitor> tstats tcp
tcp-recv             : 305: ThreadFinished
tcp-send             : 304: ThreadBlocked BlockedOnSTM
tcp-srv              : 144: ThreadBlocked BlockedOnMVar
tcp-srv              : 151: ThreadBlocked BlockedOnMVar

monitor> tstats tls
tls-recv             : 464: ThreadFinished
tls-send             : 463: ThreadBlocked BlockedOnSTM
tls-srv              : 163: ThreadBlocked BlockedOnMVar
tls-srv              : 167: ThreadBlocked BlockedOnMVar

The end condition of the sender is determined by waiting for three states:

• EOF state
• requests being processed
• availability of retrieving the result (from queue).

[kazu-yamamoto]

Please use >> instead of *>.