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more TDB

This commit is contained in:
Hongze Cheng 2022-02-07 09:46:21 +00:00
parent 24fe6cb2df
commit a583407354
3 changed files with 25 additions and 10 deletions
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10
source/libs/tdb/src/db/pgcache.c
View File

@ -14,16 +14,6 @@
*/ */
#include "tdbInt.h" #include "tdbInt.h"
typedef TD_DLIST_NODE(SPage) SPgListNode;
struct SPage {
pgid_t pgid; // page id
frame_id_t frameid; // frame id
SPgListNode freeNode; // for SPgCache.freeList
SPgListNode pghtNode; // for pght
SPgListNode lruNode; // for LRU
uint8_t * pData; // real data
};
typedef TD_DLIST(SPage) SPgList; typedef TD_DLIST(SPage) SPgList;
struct SPgCache { struct SPgCache {

15
source/libs/tdb/src/db/pgfile.c
View File

@ -15,6 +15,8 @@
#include "tdbInt.h" #include "tdbInt.h"
static int pgFileRead(SPgFile *pPgFile, pgno_t pgno, uint8_t *pData);
int pgFileOpen(const char *fname, SPgCache *pPgCache, SPgFile **ppPgFile) { int pgFileOpen(const char *fname, SPgCache *pPgCache, SPgFile **ppPgFile) {
SPgFile *pPgFile; SPgFile *pPgFile;
@ -80,6 +82,14 @@ SPage *pgFileFetch(SPgFile *pPgFile, pgno_t pgno) {
// TODO // TODO
} else { } else {
pPage = pgCacheFetch(pPgCache, pgid); pPage = pgCacheFetch(pPgCache, pgid);
if (1 /*Page is cached, no need to load from file*/) {
return pPage;
} else {
if (pgFileRead(pPgFile, pgno, pPage->pData) < 0) {
// todoerr
}
return pPage;
}
} }
return pPage; return pPage;
@ -94,3 +104,8 @@ int pgFileWrite(SPage *pPage) {
// TODO // TODO
return 0; return 0;
} }
static int pgFileRead(SPgFile *pPgFile, pgno_t pgno, uint8_t *pData) {
// TODO
return 0;
}

10
source/libs/tdb/src/inc/pgcache.h
View File

@ -34,6 +34,16 @@ int pgCacheRelease(SPage *pPage);
// SPage // SPage
typedef TD_DLIST_NODE(SPage) SPgListNode;
struct SPage {
pgid_t pgid; // page id
frame_id_t frameid; // frame id
SPgListNode freeNode; // for SPgCache.freeList
SPgListNode pghtNode; // for pght
SPgListNode lruNode; // for LRU
uint8_t * pData; // real data
};
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif