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WAL

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This commit is contained in:
Vadim B. Mikheev
2000-10-28 16:21:00 +00:00
parent 2f4c9d39fe
commit 5b0740d3fc
25 changed files with 2829 additions and 272 deletions
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108
src/backend/access/transam/xlogutils.c
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@ -22,6 +22,7 @@
#include "access/htup.h"
#include "access/xlogutils.h"
#include "catalog/pg_database.h"
#include "lib/hasht.h"
/*
* ---------------------------------------------------------------
@ -240,32 +241,10 @@ static int _xlcnt = 0;
#define _XLOG_INITRELCACHESIZE 32
#define _XLOG_MAXRELCACHESIZE 512
void
XLogCloseRelationCache(void)
{
int i;
if (!_xlrelarr)
return;
for (i = 1; i < _xlast; i++)
{
Relation reln = &(_xlrelarr[i].reldata);
if (reln->rd_fd >= 0)
smgrclose(DEFAULT_SMGR, reln);
}
free(_xlrelarr);
free(_xlpgcarr);
hash_destroy(_xlrelcache);
_xlrelarr = NULL;
}
static void
_xl_init_rel_cache(void)
{
HASHCTL ctl;
HASHCTL ctl;
_xlcnt = _XLOG_INITRELCACHESIZE;
_xlast = 0;
@ -286,6 +265,35 @@ _xl_init_rel_cache(void)
HASH_ELEM | HASH_FUNCTION);
}
static void
_xl_remove_hash_entry(XLogRelDesc **edata, int dummy)
{
XLogRelCacheEntry *hentry;
bool found;
XLogRelDesc *rdesc = *edata;
Form_pg_class tpgc = rdesc->reldata.rd_rel;
rdesc->lessRecently->moreRecently = rdesc->moreRecently;
rdesc->moreRecently->lessRecently = rdesc->lessRecently;
hentry = (XLogRelCacheEntry*) hash_search(_xlrelcache,
(char*)&(rdesc->reldata.rd_node), HASH_REMOVE, &found);
if (hentry == NULL)
elog(STOP, "_xl_remove_hash_entry: can't delete from cache");
if (!found)
elog(STOP, "_xl_remove_hash_entry: file was not found in cache");
if (rdesc->reldata.rd_fd >= 0)
smgrclose(DEFAULT_SMGR, &(rdesc->reldata));
memset(rdesc, 0, sizeof(XLogRelDesc));
memset(tpgc, 0, sizeof(FormData_pg_class));
rdesc->reldata.rd_rel = tpgc;
return;
}
static XLogRelDesc*
_xl_new_reldesc(void)
{
@ -310,34 +318,43 @@ _xl_new_reldesc(void)
}
else /* reuse */
{
XLogRelCacheEntry *hentry;
bool found;
XLogRelDesc *res = _xlrelarr[0].moreRecently;
Form_pg_class tpgc = res->reldata.rd_rel;
XLogRelDesc *res = _xlrelarr[0].moreRecently;
res->lessRecently->moreRecently = res->moreRecently;
res->moreRecently->lessRecently = res->lessRecently;
hentry = (XLogRelCacheEntry*) hash_search(_xlrelcache,
(char*)&(res->reldata.rd_node), HASH_REMOVE, &found);
if (hentry == NULL)
elog(STOP, "XLogOpenRelation: can't delete from cache");
if (!found)
elog(STOP, "XLogOpenRelation: file was not found in cache");
if (res->reldata.rd_fd >= 0)
smgrclose(DEFAULT_SMGR, &(res->reldata));
memset(res, 0, sizeof(XLogRelDesc));
memset(tpgc, 0, sizeof(FormData_pg_class));
res->reldata.rd_rel = tpgc;
_xl_remove_hash_entry(&res, 0);
_xlast--;
return(res);
}
}
extern void CreateDummyCaches(void);
extern void DestroyDummyCaches(void);
void
XLogInitRelationCache(void)
{
CreateDummyCaches();
_xl_init_rel_cache();
}
void
XLogCloseRelationCache(void)
{
DestroyDummyCaches();
if (!_xlrelarr)
return;
HashTableWalk(_xlrelcache, (HashtFunc)_xl_remove_hash_entry, 0);
hash_destroy(_xlrelcache);
free(_xlrelarr);
free(_xlpgcarr);
_xlrelarr = NULL;
}
Relation
XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
{
@ -345,9 +362,6 @@ XLogOpenRelation(bool redo, RmgrId rmid, RelFileNode rnode)
XLogRelCacheEntry *hentry;
bool found;
if (!_xlrelarr)
_xl_init_rel_cache();
hentry = (XLogRelCacheEntry*)
hash_search(_xlrelcache, (char*)&rnode, HASH_FIND, &found);