Question about handshake_receiver in IPC

[Yuxin Ren]

Hi,

I find before handle IPC, we always call handshake_receiver function.
A basic question is why do we need to handshake receiver? What do we
do when we handshake_receiver?

Another thing I note is we have separate handshake_receiver
(remote_handshake_receiver)
if the receiver is on the other core.
What is the difference between those two handshake_receiver functions?

Thank you very much.
Best,
Yuixn
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