sync: Implement Clone
for watch::Sender
#6388
Merged
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Motivation
This PR attempt to resolve #4809.
Currently, watch channel has only one sender but this enable it to be mpmc by adding a
clone
of the sender.Solution
As with the reciever, the
ref_count_tx
field is added to the shared structure to record the number of senders; this counter is incremented by the sender'sclone
method and decremented by thedrop
method.