Talkback signal that sends instructions from a sink to a source.
Remarks
This signal is issued via talkback functions that a Sink receives via
the Start signal, to tell a Source to either send a new value (pulling) or stop
sending values altogether (cancellation).
Talkback signal that sends instructions from a sink to a source.
Remarks
This signal is issued via talkback functions that a Sink receives via the Start signal, to tell a Source to either send a new value (pulling) or stop sending values altogether (cancellation).