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Comment on dead code in AtAbort_Portals() and AtSubAbort_Portals().

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Reviewed by Tom Lane and Robert Haas.
This commit is contained in:
Noah Misch 2016-02-05 20:23:40 -05:00
parent f4aa3a18a2
commit 41baee7a93
1 changed files with 16 additions and 4 deletions
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20
src/backend/utils/mmgr/portalmem.c
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@ -765,7 +765,14 @@ AtAbort_Portals(void)
{
Portal portal = hentry->portal;
/* Any portal that was actually running has to be considered broken */
/*
* See similar code in AtSubAbort_Portals(). This would fire if code
* orchestrating multiple top-level transactions within a portal, such
* as VACUUM, caught errors and continued under the same portal with a
* fresh transaction. No part of core PostgreSQL functions that way.
* XXX Such code would wish the portal to remain ACTIVE, as in
* PreCommit_Portals().
*/
if (portal->status == PORTAL_ACTIVE)
MarkPortalFailed(portal);
@ -919,9 +926,10 @@ AtSubAbort_Portals(SubTransactionId mySubid,
portal->activeSubid = parentSubid;
/*
* Upper-level portals that failed while running in this
* subtransaction must be forced into FAILED state, for the
* same reasons discussed below.
* A MarkPortalActive() caller ran an upper-level portal in
* this subtransaction and left the portal ACTIVE. This can't
* happen, but force the portal into FAILED state for the same
* reasons discussed below.
*
* We assume we can get away without forcing upper-level READY
* portals to fail, even if they were run and then suspended.
@ -961,6 +969,10 @@ AtSubAbort_Portals(SubTransactionId mySubid,
* We have to do this because they might refer to objects created or
* changed in the failed subtransaction, leading to crashes within
* ExecutorEnd when portalcmds.c tries to close down the portal.
* Currently, every MarkPortalActive() caller ensures it updates the
* portal status again before relinquishing control, so ACTIVE can't
* happen here. If it does happen, dispose the portal like existing
* MarkPortalActive() callers would.
*/
if (portal->status == PORTAL_READY ||
portal->status == PORTAL_ACTIVE)