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From: Heikki Linnakangas <[email protected]>
To: Tom Lane <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Simon Riggs <[email protected]>
Cc: [email protected]
Cc: Hiroyuki Yamada <[email protected]>
Subject: Re: Synchronization primitives (Was: Re: An example of bugs for Hot Standby)
Date: Wed, 20 Jan 2010 21:22:49 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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Tom Lane wrote:
> Heikki Linnakangas <[email protected]> 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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