fut0lst.ic
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- /**********************************************************************
- File-based list utilities
- (c) 1995 Innobase Oy
- Created 11/28/1995 Heikki Tuuri
- ***********************************************************************/
- #include "fut0fut.h"
- #include "mtr0log.h"
- #include "buf0buf.h"
- /* We define the field offsets of a node for the list */
- #define FLST_PREV 0 /* 6-byte address of the previous list element;
- the page part of address is FIL_NULL, if no
- previous element */
- #define FLST_NEXT FIL_ADDR_SIZE /* 6-byte address of the next
- list element; the page part of address
- is FIL_NULL, if no next element */
- /* We define the field offsets of a base node for the list */
- #define FLST_LEN 0 /* 32-bit list length field */
- #define FLST_FIRST 4 /* 6-byte address of the first element
- of the list; undefined if empty list */
- #define FLST_LAST (4 + FIL_ADDR_SIZE) /* 6-byte address of the
- last element of the list; undefined
- if empty list */
- /************************************************************************
- Writes a file address. */
- UNIV_INLINE
- void
- flst_write_addr(
- /*============*/
- fil_faddr_t* faddr, /* in: pointer to file faddress */
- fil_addr_t addr, /* in: file address */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- ut_ad(faddr && mtr);
- ut_ad(mtr_memo_contains(mtr, buf_block_align(faddr),
- MTR_MEMO_PAGE_X_FIX));
- mlog_write_ulint(faddr + FIL_ADDR_PAGE, addr.page, MLOG_4BYTES, mtr);
- mlog_write_ulint(faddr + FIL_ADDR_BYTE, addr.boffset,
- MLOG_2BYTES, mtr);
- }
- /************************************************************************
- Reads a file address. */
- UNIV_INLINE
- fil_addr_t
- flst_read_addr(
- /*===========*/
- /* out: file address */
- fil_faddr_t* faddr, /* in: pointer to file faddress */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- fil_addr_t addr;
- ut_ad(faddr && mtr);
- addr.page = mtr_read_ulint(faddr + FIL_ADDR_PAGE, MLOG_4BYTES, mtr);
- addr.boffset = mtr_read_ulint(faddr + FIL_ADDR_BYTE, MLOG_2BYTES,
- mtr);
- return(addr);
- }
- /************************************************************************
- Initializes a list base node. */
- UNIV_INLINE
- void
- flst_init(
- /*======*/
- flst_base_node_t* base, /* in: pointer to base node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- ut_ad(mtr_memo_contains(mtr, buf_block_align(base),
- MTR_MEMO_PAGE_X_FIX));
- mlog_write_ulint(base + FLST_LEN, 0, MLOG_4BYTES, mtr);
- flst_write_addr(base + FLST_FIRST, fil_addr_null, mtr);
- flst_write_addr(base + FLST_LAST, fil_addr_null, mtr);
- }
- /************************************************************************
- Gets list length. */
- UNIV_INLINE
- ulint
- flst_get_len(
- /*=========*/
- /* out: length */
- flst_base_node_t* base, /* in: pointer to base node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- return(mtr_read_ulint(base + FLST_LEN, MLOG_4BYTES, mtr));
- }
- /************************************************************************
- Gets list first node address. */
- UNIV_INLINE
- fil_addr_t
- flst_get_first(
- /*===========*/
- /* out: file address */
- flst_base_node_t* base, /* in: pointer to base node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- return(flst_read_addr(base + FLST_FIRST, mtr));
- }
- /************************************************************************
- Gets list last node address. */
- UNIV_INLINE
- fil_addr_t
- flst_get_last(
- /*==========*/
- /* out: file address */
- flst_base_node_t* base, /* in: pointer to base node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- return(flst_read_addr(base + FLST_LAST, mtr));
- }
- /************************************************************************
- Gets list next node address. */
- UNIV_INLINE
- fil_addr_t
- flst_get_next_addr(
- /*===============*/
- /* out: file address */
- flst_node_t* node, /* in: pointer to node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- return(flst_read_addr(node + FLST_NEXT, mtr));
- }
- /************************************************************************
- Gets list prev node address. */
- UNIV_INLINE
- fil_addr_t
- flst_get_prev_addr(
- /*===============*/
- /* out: file address */
- flst_node_t* node, /* in: pointer to node */
- mtr_t* mtr) /* in: mini-transaction handle */
- {
- return(flst_read_addr(node + FLST_PREV, mtr));
- }