| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Synchronous replication: sleeping |
| Date: | 2008-12-08 13:36:27 |
| Message-ID: | 23532.1228743387@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> On Mon, Dec 08, 2008 at 01:12:39PM +0200, Heikki Linnakangas wrote:
>> BTW, on what platforms signal doesn't interrupt sleep?
> In theory, none.
In practice, they exist. In particular I can demonstrate the issue
on HPUX 10.20. I also dispute your claim that the behavior is
forbidden by standards, For example, the Single Unix Spec
http://www.opengroup.org/onlinepubs/007908799/xsh/select.html
saith
If SA_RESTART has been set for the interrupting signal, it is
implementation-dependent whether select() restarts or returns with
[EINTR].
and since we set SA_RESTART for most everything, we are exposed to the
implementation dependency.
I complained about this previously, but nothing came of it:
http://archives.postgresql.org/pgsql-hackers/2007-07/msg00003.php
regards, tom lane
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