[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                               |  assigned
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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Comment (by yawning):

 https://github.com/Yawning/tor/compare/feature13737

 Initial pass.  I still need to figure out what I want to do when there's
 max tasks queued and we get a created, and also to support canceling
 CREATED processing when the circuit gets removed when it's pending. I
 *think* the way things are structured now, the code is merely inefficient
 instead of crashing, but adding cancellation support is the right thing to
 do.

 Now that I think about it, I'll probably go and rename a bunch of stuff
 (again) so I don't have lots of pain when I decide to parallelize
 `onion_skin_create` (Needed when #17272 happens)...

 So, this branch will get force-pushed at some point.  At least it shows
 how I think this should work...

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13737#comment:9>
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