Justin C. Miller ef307e8ec6 [kernel] Fix mailbox bugs ...

This commit contains a number of related mailbox issues:

- Add extra parameters to mailbox_respond_receive to allow both the
  number of bytes/handles passed in, and the size of the byte/handle
  buffers to be passed in.
- Don't delete mailbox messages on receipt if the caller is waiting on
  reply
- Correctly pass status messages along with a mailbox::replyer object
- Actually wake the calling thread in the mailbox::replyer dtor
- Make sure to release locks _before_ calling thread::wake() on blocked
  threads, as that may cause them to be scheduled ahead of the current
  thread.

2022-02-28 20:16:42 -08:00

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