[tor-bugs] #23581 [Core Tor/Tor]: Die more helpfully if Schedulers option isn't compatible with platform

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#23581: Die more helpfully if Schedulers option isn't compatible with platform
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 Reporter:  pastly        |          Owner:  (none)
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-sched     |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by dgoulet):

 I see two possible behaviors to solve this:

 1. We exit(1) if `select_scheduler()` can't set a scheduler. So in this
 case, you tried to put KIST only on a platform that doesn't support it, we
 stop and ask you to fix your torrc.

 2. We fallback to some default (`KISTLite` for instance) and warn the
 user.

 The approach in (1) has a bad side effect of if at runtime the new type is
 not usable well tor will just stop... As for (2), it is very possible the
 user just don't notice the fallback and end up with a tor scheduler it
 didn't want (not sure that's really a big issue...)

 For now, I'm for (2) ? Objections?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23581#comment:2>
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