[tor-bugs] #13737 [Tor]: Implement circuit building crypto to worker

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#13737: Implement circuit building crypto to worker
-------------------------------------------------+-------------------------
 Reporter:  dgoulet                              |          Owner:
     Type:  enhancement                          |         Status:
 Priority:  Medium                               |  needs_review
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.???
 Keywords:  tor-client, tor-hs, multicore,       |        Version:  Tor:
  performance, 027-triaged-1-in                  |  0.2.7
Parent ID:                                       |     Resolution:
  Sponsor:                                       |  Actual Points:
                                                 |         Points:  small-
                                                 |  remaning
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Changes (by yawning):

 * status:  assigned => needs_review


Comment:

 Ok. I just squashed down my branch.  One day in the future, we should
 strongly consider also parallelizing `onion_skin_create`, but it's
 reasonably fast for now (~25 usec) vs the client/server side specific
 parts of NTOR (~160 usec).

 One side benefit of the new code is that there is a centralized place to
 add rate limiting for outgoing handshakes if we decide to do something
 different under extreme load in the future
 (`origin_pending_add()`/`origin_next_task()`).

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13737#comment:10>
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