| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-hackers(at)postgresql(dot)org, Hiroyuki Yamada <yamada(at)kokolink(dot)net> |
| Subject: | Re: Synchronization primitives (Was: Re: An example of bugs for Hot Standby) |
| Date: | 2010-01-20 19:22:49 |
| Message-ID: | 4B575809.7000106@enterprisedb.com |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> My point is that we should replace such polling loops with something
>> non-polling, using wait/signal or semaphores or something. That gets
>> quite a bit more complex. You'd probably still have the loop, but
>> instead of pg_usleep() you'd call some new primitive function that waits
>> until the shared variable changes.
>
> Maybe someday --- it's certainly not something we need to mess with for
> 8.5. As Simon comments, getting it to work nicely in the face of corner
> cases (like processes dying unexpectedly) could be a lot of work.
Agreed, polling is good enough for 8.5.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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