[wp-trac] [WordPress Trac] #39828: Multiple do_pings events shouldn't be scheduled

[WordPress Trac]

#39828: Multiple do_pings events shouldn't be scheduled
------------------------------+-----------------------------
 Reporter:  ethitter          |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Pings/Trackbacks  |    Version:  2.0.1
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 Whenever `_publish_post_hook()` is called, a new `do_pings` event is
 scheduled in wp-cron. Since `do_all_pings()` (the callback hooked to
 `do_pings` by default) takes no arguments, and pings ''everything'' that
 needs pinging each time it runs, there's no need to schedule multiple of
 these events.

 The potential for duplicate events has existed since its introduction in
 r3663. As part of #6966, r9181 aimed to reduce duplicate events. If a
 site's cron is backlogged, however, that workaround will fail as it only
 looks ahead.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39828>
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