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This patch is the next step towards (re)allowing fork/exec.

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Claudio Natoli
This commit is contained in:
Bruce Momjian
2003-12-20 17:31:21 +00:00
parent 1ee0ddf91d
commit d75b2ec4eb
23 changed files with 490 additions and 216 deletions
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22
src/backend/storage/freespace/freespace.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.27 2003/12/12 18:45:09 petere Exp $
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.28 2003/12/20 17:31:21 momjian Exp $
*
*
* NOTES:
@@ -180,7 +180,6 @@ typedef struct FSMRelation FSMRelation;
/* Header for whole map */
struct FSMHeader
{
HTAB *relHash; /* hashtable of FSMRelation entries */
FSMRelation *usageList; /* FSMRelations in usage-recency order */
FSMRelation *usageListTail; /* tail of usage-recency list */
FSMRelation *firstRel; /* FSMRelations in arena storage order */
@@ -218,6 +217,7 @@ int MaxFSMRelations; /* these are set by guc.c */
int MaxFSMPages;
static FSMHeader *FreeSpaceMap; /* points to FSMHeader in shared memory */
static HTAB *FreeSpaceMapRelHash; /* points to (what used to be) FSMHeader->relHash */
static FSMRelation *lookup_fsm_rel(RelFileNode *rel);
@@ -265,13 +265,15 @@ InitFreeSpaceMap(void)
{
HASHCTL info;
int nchunks;
bool found;
/* Create table header */
FreeSpaceMap = (FSMHeader *) ShmemAlloc(sizeof(FSMHeader));
FreeSpaceMap = (FSMHeader *) ShmemInitStruct("Free Space Map Header",sizeof(FSMHeader),&found);
if (FreeSpaceMap == NULL)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("insufficient shared memory for free space map")));
if (!found)
MemSet(FreeSpaceMap, 0, sizeof(FSMHeader));
/* Create hashtable for FSMRelations */
@@ -279,17 +281,21 @@ InitFreeSpaceMap(void)
info.entrysize = sizeof(FSMRelation);
info.hash = tag_hash;
FreeSpaceMap->relHash = ShmemInitHash("Free Space Map Hash",
FreeSpaceMapRelHash = ShmemInitHash("Free Space Map Hash",
MaxFSMRelations / 10,
MaxFSMRelations,
&info,
(HASH_ELEM | HASH_FUNCTION));
if (!FreeSpaceMap->relHash)
if (!FreeSpaceMapRelHash)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("insufficient shared memory for free space map")));
if (found)
return;
/* Allocate page-storage arena */
nchunks = (MaxFSMPages - 1) / CHUNKPAGES + 1;
/* This check ensures spareChunks will be greater than zero */
@@ -974,7 +980,7 @@ lookup_fsm_rel(RelFileNode *rel)
{
FSMRelation *fsmrel;
fsmrel = (FSMRelation *) hash_search(FreeSpaceMap->relHash,
fsmrel = (FSMRelation *) hash_search(FreeSpaceMapRelHash,
(void *) rel,
HASH_FIND,
NULL);
@@ -995,7 +1001,7 @@ create_fsm_rel(RelFileNode *rel)
FSMRelation *fsmrel;
bool found;
fsmrel = (FSMRelation *) hash_search(FreeSpaceMap->relHash,
fsmrel = (FSMRelation *) hash_search(FreeSpaceMapRelHash,
(void *) rel,
HASH_ENTER,
&found);
@@ -1050,7 +1056,7 @@ delete_fsm_rel(FSMRelation *fsmrel)
unlink_fsm_rel_usage(fsmrel);
unlink_fsm_rel_storage(fsmrel);
FreeSpaceMap->numRels--;
result = (FSMRelation *) hash_search(FreeSpaceMap->relHash,
result = (FSMRelation *) hash_search(FreeSpaceMapRelHash,
(void *) &(fsmrel->key),
HASH_REMOVE,
NULL);