Justin C. Miller 1a04310f80 [kernel] Simplify mailbox code, and messages ...

A number of simplifications of mailboxes now that the interface is much
simpler, and synchronous.

* call and respond can now only transfer one handle at a time
* mailbox objects got rid of the message queue, and just have
  wait_queues of blocked threads, and a reply_to map.
* threads now have a message_data struct on them for use by mailboxes

2022-10-14 01:02:56 -07:00

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