diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-06-27 23:31:40 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-06-27 23:31:40 +0000 |
| commit | e0c9301c87634f21c0a7c6305bdc6da15d6ba375 (patch) | |
| tree | aad976ca0197137c3461ff19a3d0e155487f7b44 /src/include/storage/freespace.h | |
| parent | b559382134a52bbe1d79d465afd89c8385f88581 (diff) | |
Install infrastructure for shared-memory free space map. Doesn't actually
do anything yet, but it has the necessary connections to initialization
and so forth. Make some gestures towards allowing number of blocks in
a relation to be BlockNumber, ie, unsigned int, rather than signed int.
(I doubt I got all the places that are sloppy about it, yet.) On the
way, replace the hardwired NLOCKS_PER_XACT fudge factor with a GUC
variable.
Diffstat (limited to 'src/include/storage/freespace.h')
| -rw-r--r-- | src/include/storage/freespace.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/include/storage/freespace.h b/src/include/storage/freespace.h new file mode 100644 index 00000000000..083accccab8 --- /dev/null +++ b/src/include/storage/freespace.h @@ -0,0 +1,53 @@ +/*------------------------------------------------------------------------- + * + * freespace.h + * POSTGRES free space map for quickly finding free space in relations + * + * + * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * $Id: freespace.h,v 1.1 2001/06/27 23:31:39 tgl Exp $ + * + *------------------------------------------------------------------------- + */ +#ifndef FREESPACE_H_ +#define FREESPACE_H_ + +#include "storage/block.h" +#include "storage/relfilenode.h" +#include "storage/spin.h" + + +extern SPINLOCK FreeSpaceLock; + +extern int MaxFSMRelations; +extern int MaxFSMPages; + + +/* + * function prototypes + */ +extern void InitFreeSpaceMap(void); +extern int FreeSpaceShmemSize(void); + +extern BlockNumber GetPageWithFreeSpace(RelFileNode *rel, Size spaceNeeded); +extern void RecordFreeSpace(RelFileNode *rel, BlockNumber page, + Size spaceAvail); +extern BlockNumber RecordAndGetPageWithFreeSpace(RelFileNode *rel, + BlockNumber oldPage, + Size oldSpaceAvail, + Size spaceNeeded); +extern void MultiRecordFreeSpace(RelFileNode *rel, + BlockNumber minPage, + BlockNumber maxPage, + int nPages, + BlockNumber *pages, + Size *spaceAvail); +extern void FreeSpaceMapForgetRel(RelFileNode *rel); + +#ifdef FREESPACE_DEBUG +extern void DumpFreeSpace(void); +#endif + +#endif /* FREESPACE_H */ |