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Further work on connecting the free space map (which is still just a

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stub) into the rest of the system.  Adopt a cleaner approach to preventing
deadlock in concurrent heap_updates: allow RelationGetBufferForTuple to
select any page of the rel, and put the onus on it to lock both buffers
in a consistent order.  Remove no-longer-needed isExtend hack from
API of ReleaseAndReadBuffer.
This commit is contained in:
Tom Lane
2001-06-29 21:08:25 +00:00
parent 0eab92c0e6
commit af5ced9cfd
12 changed files with 381 additions and 233 deletions
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11
src/backend/commands/sequence.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.60 2001/06/23 00:07:34 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.61 2001/06/29 21:08:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -168,21 +168,26 @@ DefineSequence(CreateSeqStmt *seq)
DefineRelation(stmt, RELKIND_SEQUENCE);
rel = heap_openr(seq->seqname, AccessExclusiveLock);
tupDesc = RelationGetDescr(rel);
Assert(RelationGetNumberOfBlocks(rel) == 0);
/* Initialize first page of relation with special magic number */
buf = ReadBuffer(rel, P_NEW);
if (!BufferIsValid(buf))
elog(ERROR, "DefineSequence: ReadBuffer failed");
Assert(BufferGetBlockNumber(buf) == 0);
page = (PageHeader) BufferGetPage(buf);
PageInit((Page) page, BufferGetPageSize(buf), sizeof(sequence_magic));
sm = (sequence_magic *) PageGetSpecialPointer(page);
sm->magic = SEQ_MAGIC;
/* hack: ensure heap_insert will insert on the just-created page */
rel->rd_targblock = 0;
/* Now - form & insert sequence tuple */
tuple = heap_formtuple(tupDesc, value, null);
heap_insert(rel, tuple);