| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Hiroyuki Yamada <yamada(at)kokolink(dot)net> |
| Subject: | Re: An example of bugs for Hot Standby |
| Date: | 2010-01-20 10:04:35 |
| Message-ID: | 201001201104.35671.andres@anarazel.de |
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| Lists: | pgsql-hackers |
On Wednesday 20 January 2010 10:52:24 Simon Riggs wrote:
> On Wed, 2010-01-20 at 10:45 +0100, Andres Freund wrote:
> > LWLockAcquire
>
> I'm using spinlocks, not lwlocks.
CancelDBBackends which is used in SendRecoveryConflictWithBufferPin which in
turn used by CheckStandbyTimeout triggered by SIGALRM acquires the lwlock.
Now that case is a bit less dangerous because you would have to interrupt
yourself to trigger a deadlock there because the code sleeps soon after
setting up the handler.
If ever two SIGALRM occur consecutive there is a problem.
Andres
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