database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-14 18:42:34 +03:00
Code Activity

Nested transactions. There is still much left to do, especially on the

Browse Source 
performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
Download Patch File Download Diff File Expand all files Collapse all files

71
src/backend/commands/tablecmds.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.117 2004/06/25 21:55:53 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.118 2004/07/01 00:50:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -76,8 +76,8 @@ typedef struct OnCommitItem
* entries in the list until commit so that we can roll back if
* needed.
*/
bool created_in_cur_xact;
bool deleted_in_cur_xact;
TransactionId creating_xid;
TransactionId deleting_xid;
} OnCommitItem;
static List *on_commits = NIL;
@ -5483,8 +5483,8 @@ register_on_commit_action(Oid relid, OnCommitAction action)
oc = (OnCommitItem *) palloc(sizeof(OnCommitItem));
oc->relid = relid;
oc->oncommit = action;
oc->created_in_cur_xact = true;
oc->deleted_in_cur_xact = false;
oc->creating_xid = GetCurrentTransactionId();
oc->deleting_xid = InvalidTransactionId;
on_commits = lcons(oc, on_commits);
@ -5507,7 +5507,7 @@ remove_on_commit_action(Oid relid)
if (oc->relid == relid)
{
oc->deleted_in_cur_xact = true;
oc->deleting_xid = GetCurrentTransactionId();
break;
}
}
@ -5522,6 +5522,7 @@ remove_on_commit_action(Oid relid)
void
PreCommit_on_commit_actions(void)
{
TransactionId xid = GetCurrentTransactionId();
ListCell *l;
foreach(l, on_commits)
@ -5529,7 +5530,7 @@ PreCommit_on_commit_actions(void)
OnCommitItem *oc = (OnCommitItem *) lfirst(l);
/* Ignore entry if already dropped in this xact */
if (oc->deleted_in_cur_xact)
if (oc->deleting_xid == xid)
continue;
switch (oc->oncommit)
@ -5556,7 +5557,7 @@ PreCommit_on_commit_actions(void)
* remove_on_commit_action, so the entry should get
* marked as deleted.
*/
Assert(oc->deleted_in_cur_xact);
Assert(oc->deleting_xid == xid);
break;
}
}
@ -5572,7 +5573,7 @@ PreCommit_on_commit_actions(void)
* during abort, remove those created during this transaction.
*/
void
AtEOXact_on_commit_actions(bool isCommit)
AtEOXact_on_commit_actions(bool isCommit, TransactionId xid)
{
ListCell *cur_item;
ListCell *prev_item;
@ -5584,8 +5585,8 @@ AtEOXact_on_commit_actions(bool isCommit)
{
OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
if (isCommit ? oc->deleted_in_cur_xact :
oc->created_in_cur_xact)
if (isCommit ? TransactionIdEquals(oc->deleting_xid, xid) :
TransactionIdEquals(oc->creating_xid, xid))
{
/* cur_item must be removed */
on_commits = list_delete_cell(on_commits, cur_item, prev_item);
@ -5598,8 +5599,52 @@ AtEOXact_on_commit_actions(bool isCommit)
else
{
/* cur_item must be preserved */
oc->deleted_in_cur_xact = false;
oc->created_in_cur_xact = false;
oc->creating_xid = InvalidTransactionId;
oc->deleting_xid = InvalidTransactionId;
prev_item = cur_item;
cur_item = lnext(prev_item);
}
}
}
/*
* Post-subcommit or post-subabort cleanup for ON COMMIT management.
*
* During subabort, we can immediately remove entries created during this
* subtransaction. During subcommit, just relabel entries marked during
* this subtransaction as being the parent's responsibility.
*/
void
AtEOSubXact_on_commit_actions(bool isCommit, TransactionId childXid,
TransactionId parentXid)
{
ListCell *cur_item;
ListCell *prev_item;
prev_item = NULL;
cur_item = list_head(on_commits);
while (cur_item != NULL)
{
OnCommitItem *oc = (OnCommitItem *) lfirst(cur_item);
if (!isCommit && TransactionIdEquals(oc->creating_xid, childXid))
{
/* cur_item must be removed */
on_commits = list_delete_cell(on_commits, cur_item, prev_item);
pfree(oc);
if (prev_item)
cur_item = lnext(prev_item);
else
cur_item = list_head(on_commits);
}
else
{
/* cur_item must be preserved */
if (TransactionIdEquals(oc->creating_xid, childXid))
oc->creating_xid = parentXid;
if (TransactionIdEquals(oc->deleting_xid, childXid))
oc->deleting_xid = isCommit ? parentXid : InvalidTransactionId;
prev_item = cur_item;
cur_item = lnext(prev_item);
}