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Avoid deep recursion when assigning XIDs to multiple levels of subxacts.
Backpatch to 8.0. Andres Freund, with cleanup and adjustment for older branches by me.
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@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.293 2010/07/06 19:18:55 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.294 2010/07/23 00:43:00 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -408,10 +408,32 @@ AssignTransactionId(TransactionState s)
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/*
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* Ensure parent(s) have XIDs, so that a child always has an XID later
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* than its parent.
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* than its parent. Musn't recurse here, or we might get a stack overflow
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* if we're at the bottom of a huge stack of subtransactions none of which
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* have XIDs yet.
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*/
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if (isSubXact && !TransactionIdIsValid(s->parent->transactionId))
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AssignTransactionId(s->parent);
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{
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TransactionState p = s->parent;
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TransactionState *parents;
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size_t parentOffset = 0;
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parents = palloc(sizeof(TransactionState) * s->nestingLevel);
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while (p != NULL && !TransactionIdIsValid(p->transactionId))
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{
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parents[parentOffset++] = p;
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p = p->parent;
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}
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/*
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* This is technically a recursive call, but the recursion will
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* never be more than one layer deep.
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*/
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while (parentOffset != 0)
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AssignTransactionId(parents[--parentOffset]);
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pfree(parents);
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}
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/*
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* Generate a new Xid and record it in PG_PROC and pg_subtrans.
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