Re: CommitFest 2009-07: Yay, Kevin! Thanks, reviewers!

On 19/08/10 18:08, Alvaro Herrera wrote:
> Excerpts from Heikki Linnakangas's message of jue ago 19 02:02:34 -0400 2010:
>> On 19/08/10 04:46, Robert Haas wrote:
>
>>>   And so far we haven't seen a patch for that.
>>> Somebody write one.  And then let's get it reviewed and committed RSN.
>>
>> Fujii is on vacation, but I've started working on it. The two issues
>> with Fujii's latest patch are that it would not respond promptly on
>> platforms where signals don't interrupt sleep, and it suffers the
>> classic race condition that pselect() was invented for. I'm going to
>> replace pg_usleep() with select(), and use the so called "self-pipe
>> trick" to get over the race condition. I have that written up but I want
>> to do some testing and cleanup before posting the patch.
>
> Hmm, IIRC the self-pipe trick doesn't work on Windows, mainly because
> select() doesn't handle pipes, only sockets.  You may need some extra
> hack to make it work there.

That's fine, we can do the naive set-a-flag implementation on Windows 
because on Windows our "signals" are only delivered at 
CHECK_FOR_INTERRUPTS(), so we don't have the race condition to begin with.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com