[wp-hackers] WP cron and "multi-threading"
mark.wordpress at txfx.net
Mon Oct 9 06:00:35 GMT 2006
On Oct 9, 2006, at 12:14 AM, Robert Deaton wrote:
>> Mark Jaquith wrote:
>> > You need to expire the "cron_is_running" option, in case your
>> > race candidate dies before it gets to unset it.
> No, if it loses the race condition, something else has overwritten it.
> The other thread that won the race condition will clean it up when its
It'll clean up *IF* it finishes. What if one of the cron'd actions
causes a fatal error? Then you're stuck with "cron_is_running" set
to a key that'll never be matched again.
Pretend that Tom Hanks is a process. He claims Helen Hunt by
marrying her. Then, his FedEx plane crashes and he's stranded on a
tropical island with only an inflatable ball as a companion. Helen
Hunt is stuck, because she can't confirm that Hanks has died or
otherwise *explicitly* relinquished his claim on her as his spouse.
Should she wait forever? Nah. She waits a few years and Hanks is
declared legally dead, and she remarries.
Sort of like that. :-)
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