Question about _wq in the class Sender

Yuxin Ren <[email protected]>
Newsgroups gmane.comp.micro-kernel.l4.devel
Message-ID <CAAKbDrdbyjc=Jo70agA4KOEa2BhEPOnKAmbFNsGcmiHkTCoHzA@mail.gmail.com>
Hi,

I note in the Sender class there is a variable "_wq".
What is the role of this variable?
And in the IPC, we set it to the sender_list of receiver.
Why?

Thank you.
Yuxin

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