[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 dgoulet):

 Replying to [comment:13 cypherpunks]:
 > Replying to [comment:12 dgoulet]:
 > > * I think a `pubsub_free_` would be useful because right this leaks
 the `static pubsub_topic_t name ## _topic_ = { NULL, 0 };`.
 >
 > dgoulet, dude!
 Ahah... I really thought this one was a pointer. Nvm :)

 >
 > > 2) Why is `DEFINE_PUBSUB_TOPIC` and `DEFINE_NOTIFY_PUBSUB_TOPIC` are
 separated? I feel like _not_ having a notify function defined will end up
 breaking `IMPLEMENT_PUBSUB_TOPIC` so maybe merge them together?
 > >
 > > 3) Is there a reason why only the `notify` and `clear` can have a
 different linkage? I can see myself wanting _all_ the functions `static`.
 >
 > It's supposed to be an inter-module facility, remember? Think about it.

 It is but that doesn't mean it has to be used inter-module _all_ the time
 thus controlling the linkage here is cheap and desirable imo.

 >
 > (Though, about the linkage: it may actually be useful to have the option
 anyway.)
 >
 > (Also: `DEFINE_*` should really be `DECLARE_*`, definition is the same
 as implementation.)

 Agree.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18363#comment:14>
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