xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

more TDB

This commit is contained in:
Hongze Cheng 2022-03-14 06:20:10 +00:00
parent d7a127136f
commit 0734436db8
1 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
source/libs/tdb/src/db/tdbPage.c
View File

@ -16,8 +16,8 @@
#include "tdbInt.h"
typedef struct __attribute__((__packed__)) {
u16 size;
u16 nxOffset;
u8 size[2];
u8 nxOffset[2];
} SFreeCell;
typedef struct __attribute__((__packed__)) {
@ -26,18 +26,24 @@ typedef struct __attribute__((__packed__)) {
} SFreeCellL;
/* For small page */
#define TDB_SPAGE_FREE_CELL_SIZE(PCELL) (((SFreeCell *)(PCELL))[0].size)
#define TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL) (((SFreeCell *)(PCELL))[0].nxOffset)
#define TDB_SPAGE_FREE_CELL_SIZE_PTR(PCELL) (((SFreeCell *)(PCELL))->size)
#define TDB_SPAGE_FREE_CELL_NXOFFSET_PTR(PCELL) (((SFreeCell *)(PCELL))->nxOffset)
#define TDB_SPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE) (((SFreeCell *)(PCELL))[0].size = (SIZE))
#define TDB_SPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) (((SFreeCell *)(PCELL))[0].nxOffset = (OFFSET))
#define TDB_SPAGE_FREE_CELL_SIZE(PCELL) ((u16 *)TDB_SPAGE_FREE_CELL_SIZE_PTR(PCELL))[0]
#define TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL) ((u16 *)TDB_SPAGE_FREE_CELL_NXOFFSET_PTR(PCELL))[0]
#define TDB_SPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE) (TDB_SPAGE_FREE_CELL_SIZE(PCELL) = (SIZE))
#define TDB_SPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) (TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL) = (OFFSET))
/* For large page */
#define TDB_LPAGE_FREE_CELL_SIZE(PCELL) TDB_GET_U24(((SFreeCellL *)(PCELL))[0].size)
#define TDB_LPAGE_FREE_CELL_NXOFFSET(PCELL) TDB_GET_U24(((SFreeCellL *)(PCELL))[0].nxOffset)
#define TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL) (((SFreeCellL *)(PCELL))->size)
#define TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL) (((SFreeCellL *)(PCELL))->nxOffset)
#define TDB_LPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE) TDB_PUT_U24(((SFreeCellL *)(PCELL))[0].size, SIZE)
#define TDB_LPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) TDB_PUT_U24(((SFreeCellL *)(PCELL))[0].nxOffset, OFFSET)
#define TDB_LPAGE_FREE_CELL_SIZE(PCELL) TDB_GET_U24(TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL))
#define TDB_LPAGE_FREE_CELL_NXOFFSET(PCELL) TDB_GET_U24(TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL))
#define TDB_LPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE) TDB_PUT_U24(TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL), SIZE)
#define TDB_LPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) TDB_PUT_U24(TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL), OFFSET)
/* For page */
#define TDB_PAGE_FREE_CELL_SIZE(PPAGE, PCELL) \
@ -157,8 +163,15 @@ static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) {
// 2. Try to allocate from the page free list
if ((pCell == NULL) && (pPage->pFreeEnd - pPage->pFreeStart >= pPage->szOffset) && TDB_PAGE_FCELL(pPage)) {
pCell = pPage->pData + TDB_PAGE_FCELL(pPage);
// TODO: pOffset = TDB_PAGE_FCELL(pPage);
pOffset = TDB_IS_LARGE_PAGE(pPage) ? ((SLPageHdr *)(pPage->pPageHdr))[0].fCell
: (u8 *)&(((SPageHdr *)(pPage->pPageHdr))[0].fCell);
for (;;) {
if (TDB_PAGE_FREE_CELL_SIZE(pPage, pCell) >= size) {
}
}
#if 0
for (;;) {
pFreeCell = (SFreeCell *)pCell;
@ -184,9 +197,14 @@ static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) {
continue;
}
if (pCell) {
// TODO
}
#endif
}
// 3. Try to dfragment
// 3. Try to dfragment and allocate again
if (pCell == NULL) {
ret = tdbPageDefragment(pPage);
if (ret < 0) {