[tor-bugs] #3518 [Tor Client]: Update circuit-launch and predictive circuit-launch logic for prop 171

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#3518: Update circuit-launch and predictive circuit-launch logic for prop 171
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 Reporter:  nickm        |          Owner:                    
     Type:  enhancement  |         Status:  new               
 Priority:  normal       |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Client   |        Version:                    
 Keywords:               |         Parent:  #1865             
   Points:               |   Actualpoints:                    
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 Once we implement stream isolation correctly (#3517), we will need to
 revise our code that launches circuits for predicted streams and our code
 that launches circuits for unhandled streams.

 Right now (first approximation), we launch circuits until every unhandled
 stream has at least one in-progress circuit that it could attach to.  But
 prop 171 breaks that behavior, since just because in-progress circuit C
 could handle stream A or handle stream B, it does not follow that it could
 handle A and B simultaneously.

 There are similar issues with predicted circuits; we should analyze them
 in more depth too.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3518>
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