[tor-bugs] #18363 [Core Tor/Tor]: Tor could use a publish/subscribe abstraction

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#18363: Tor could use a publish/subscribe abstraction
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 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
 Priority:  High                                 |  needs_revision
Component:  Core Tor/Tor                         |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  modularity, tor-modularity,          |        Version:
  TorCoreTeam201605, TorCoreTeam-                |     Resolution:
  postponed-201604                               |  Actual Points:
Parent ID:                                       |         Points:  medium
 Reviewer:  dgoulet                              |        Sponsor:
                                                 |  SponsorS-can
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Comment (by nickm):

 I fixed some of the simpler issues.  I'm going to wontfix the following
 ones:
    * The static/public stuff.  I think that I got it right, as cpunks
 describes above, but it'll be easy enough to fix later if we need it
 different.
    * Function naming stuff; I don't mind the names.  Also they're easy
 enough to change later if somebody makes a patch.
    * Yes, foo_subscriber_t is only a tag.
    * Low-valued priorities meaning "do this first" is all over POSIX; I'm
 not changing that.

 That leaves these as my remaining items:
   * Seeing if I can mess with the type definitions so that you don't need
 to declare a struct for non-compound message types.
   * The "interesting" interactions as described above.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18363#comment:16>
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