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Move multixid allocation out of critical section.

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It can fail if you run out of memory.

This call was added in 9.3, so backpatch to 9.3 only.
This commit is contained in:
Heikki Linnakangas 2014-04-04 18:20:22 +03:00
parent 1891a4b6b8
commit a2f9572ca5
1 changed files with 15 additions and 15 deletions
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30
src/backend/access/heap/heapam.c
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@ -2717,6 +2717,21 @@ l1:
/* replace cid with a combo cid if necessary */ /* replace cid with a combo cid if necessary */
HeapTupleHeaderAdjustCmax(tp.t_data, &cid, &iscombo); HeapTupleHeaderAdjustCmax(tp.t_data, &cid, &iscombo);
/*
* If this is the first possibly-multixact-able operation in the current
* transaction, set my per-backend OldestMemberMXactId setting. We can be
* certain that the transaction will never become a member of any older
* MultiXactIds than that. (We have to do this even if we end up just
* using our own TransactionId below, since some other backend could
* incorporate our XID into a MultiXact immediately afterwards.)
*/
MultiXactIdSetOldestMember();
compute_new_xmax_infomask(HeapTupleHeaderGetRawXmax(tp.t_data),
tp.t_data->t_infomask, tp.t_data->t_infomask2,
xid, LockTupleExclusive, true,
&new_xmax, &new_infomask, &new_infomask2);
START_CRIT_SECTION(); START_CRIT_SECTION();
/* /*
@ -2736,21 +2751,6 @@ l1:
vmbuffer); vmbuffer);
} }
/*
* If this is the first possibly-multixact-able operation in the current
* transaction, set my per-backend OldestMemberMXactId setting. We can be
* certain that the transaction will never become a member of any older
* MultiXactIds than that. (We have to do this even if we end up just
* using our own TransactionId below, since some other backend could
* incorporate our XID into a MultiXact immediately afterwards.)
*/
MultiXactIdSetOldestMember();
compute_new_xmax_infomask(HeapTupleHeaderGetRawXmax(tp.t_data),
tp.t_data->t_infomask, tp.t_data->t_infomask2,
xid, LockTupleExclusive, true,
&new_xmax, &new_infomask, &new_infomask2);
/* store transaction information of xact deleting the tuple */ /* store transaction information of xact deleting the tuple */
tp.t_data->t_infomask &= ~(HEAP_XMAX_BITS | HEAP_MOVED); tp.t_data->t_infomask &= ~(HEAP_XMAX_BITS | HEAP_MOVED);
tp.t_data->t_infomask2 &= ~HEAP_KEYS_UPDATED; tp.t_data->t_infomask2 &= ~HEAP_KEYS_UPDATED;