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Re: An example of bugs for Hot Standby - Mailing list pgsql-hackers

From Andres Freund
Subject Re: An example of bugs for Hot Standby
Date
Msg-id 201001201148.50054.andres@anarazel.de
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In response to Re: An example of bugs for Hot Standby  (Simon Riggs <simon@2ndQuadrant.com>)
List pgsql-hackers
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On Wednesday 20 January 2010 11:33:05 Simon Riggs wrote:
> On Wed, 2010-01-20 at 11:04 +0100, Andres Freund wrote:
> > 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.
> 
> Those are used in similar ways to deadlock detection.
But only if 
ImmediateInterruptOK && InterruptHoldoffCount == 0 && CritSectionCount == 0 - 
which is not the case with HoldingBufferPinThatDelaysRecovery.

Andres

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