database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-27 12:41:57 +03:00
Code Activity

Portal and memory management infrastructure for extended query protocol.

Browse Source 
Both plannable queries and utility commands are now always executed
within Portals, which have been revamped so that they can handle the
load (they used to be good only for single SELECT queries).  Restructure
code to push command-completion-tag selection logic out of postgres.c,
so that it won't have to be duplicated between simple and extended queries.
initdb forced due to addition of a field to Query nodes.
This commit is contained in:
Tom Lane
2003-05-02 20:54:36 +00:00
parent 1940434f1e
commit de28dc9a04
33 changed files with 2210 additions and 1698 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
src/backend/access/transam/xact.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.146 2003/04/26 20:22:59 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.147 2003/05/02 20:54:33 tgl Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@ -49,7 +49,7 @@
* * CleanupTransaction() executes when we finally see a user COMMIT
* or ROLLBACK command; it cleans things up and gets us out of
* the transaction internally. In particular, we mustn't destroy
* TransactionCommandContext until this point.
* TopTransactionContext until this point.
*
* NOTES
* The essential aspects of the transaction system are:
@ -456,13 +456,12 @@ static void
AtStart_Memory(void)
{
/*
* We shouldn't have any transaction contexts already.
* We shouldn't have a transaction context already.
*/
Assert(TopTransactionContext == NULL);
Assert(TransactionCommandContext == NULL);
/*
* Create a toplevel context for the transaction.
* Create a toplevel context for the transaction, and make it active.
*/
TopTransactionContext =
AllocSetContextCreate(TopMemoryContext,
@ -471,16 +470,7 @@ AtStart_Memory(void)
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
/*
* Create a statement-level context and make it active.
*/
TransactionCommandContext =
AllocSetContextCreate(TopTransactionContext,
"TransactionCommandContext",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
MemoryContextSwitchTo(TransactionCommandContext);
MemoryContextSwitchTo(TopTransactionContext);
}
@ -659,7 +649,6 @@ AtCommit_Memory(void)
Assert(TopTransactionContext != NULL);
MemoryContextDelete(TopTransactionContext);
TopTransactionContext = NULL;
TransactionCommandContext = NULL;
}
/* ----------------------------------------------------------------
@ -769,19 +758,18 @@ AtAbort_Memory(void)
{
/*
* Make sure we are in a valid context (not a child of
* TransactionCommandContext...). Note that it is possible for this
* TopTransactionContext...). Note that it is possible for this
* code to be called when we aren't in a transaction at all; go
* directly to TopMemoryContext in that case.
*/
if (TransactionCommandContext != NULL)
if (TopTransactionContext != NULL)
{
MemoryContextSwitchTo(TransactionCommandContext);
MemoryContextSwitchTo(TopTransactionContext);
/*
* We do not want to destroy transaction contexts yet, but it
* should be OK to delete any command-local memory.
* We do not want to destroy the transaction's global state yet,
* so we can't free any memory here.
*/
MemoryContextResetAndDeleteChildren(TransactionCommandContext);
}
else
MemoryContextSwitchTo(TopMemoryContext);
@ -812,7 +800,6 @@ AtCleanup_Memory(void)
if (TopTransactionContext != NULL)
MemoryContextDelete(TopTransactionContext);
TopTransactionContext = NULL;
TransactionCommandContext = NULL;
}
@ -926,7 +913,7 @@ CommitTransaction(void)
* access, and in fact could still cause an error...)
*/
AtEOXact_portals(true);
AtCommit_Portals();
/* handle commit for large objects [ PA, 7/17/98 ] */
/* XXX probably this does not belong here */
@ -1057,7 +1044,7 @@ AbortTransaction(void)
* do abort processing
*/
DeferredTriggerAbortXact();
AtEOXact_portals(false);
AtAbort_Portals();
lo_commit(false); /* 'false' means it's abort */
AtAbort_Notify();
AtEOXact_UpdatePasswordFile(false);
@ -1126,7 +1113,8 @@ CleanupTransaction(void)
/*
* do abort cleanup processing
*/
AtCleanup_Memory();
AtCleanup_Portals(); /* now safe to release portal memory */
AtCleanup_Memory(); /* and transaction memory */
/*
* done with abort processing, set current transaction state back to
@ -1220,11 +1208,11 @@ StartTransactionCommand(bool preventChain)
}
/*
* We must switch to TransactionCommandContext before returning. This
* We must switch to TopTransactionContext before returning. This
* is already done if we called StartTransaction, otherwise not.
*/
Assert(TransactionCommandContext != NULL);
MemoryContextSwitchTo(TransactionCommandContext);
Assert(TopTransactionContext != NULL);
MemoryContextSwitchTo(TopTransactionContext);
}
/*
@ -1266,7 +1254,6 @@ CommitTransactionCommand(bool forceCommit)
Assert(s->blockState == TBLOCK_INPROGRESS);
/* This code must match the TBLOCK_INPROGRESS case below: */
CommandCounterIncrement();
MemoryContextResetAndDeleteChildren(TransactionCommandContext);
}
break;
@ -1283,15 +1270,10 @@ CommitTransactionCommand(bool forceCommit)
/*
* This is the case when we have finished executing a command
* someplace within a transaction block. We increment the
* command counter and return. Someday we may free resources
* local to the command.
*
* That someday is today, at least for memory allocated in
* TransactionCommandContext. - vadim 03/25/97
* command counter and return.
*/
case TBLOCK_INPROGRESS:
CommandCounterIncrement();
MemoryContextResetAndDeleteChildren(TransactionCommandContext);
break;
/*