Re: Snapshot management, final - Mailing list pgsql-patches

From Simon Riggs
Subject Re: Snapshot management, final
Date
Msg-id 1208900712.4259.1268.camel@ebony.site
Whole thread Raw
In response to Snapshot management, final  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: Snapshot management, final
List pgsql-patches
On Tue, 2008-04-22 at 15:49 -0400, Alvaro Herrera wrote:

> - Three CopySnapshot call sites remain outside snapmgr.c: DoCopy() on
> copy.c, ExplainOnePlan() on explain.c and _SPI_execute_plan() on spi.c.
> They are there because they grab the current ActiveSnapshot, modify it,
> and then use the resulting snapshot.  There is no corresponding
> FreeSnapshot, because it's not needed.

Not needed? How can we be certain that the modified snapshot does not
outlive its original source?

--
  Simon Riggs
  2ndQuadrant  http://www.2ndQuadrant.com


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