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124 lines
2.7 KiB
Text
124 lines
2.7 KiB
Text
/******************************************************
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Data dictionary creation and booting
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(c) 1996 Innobase Oy
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Created 4/18/1996 Heikki Tuuri
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*******************************************************/
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/**************************************************************************
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Writes the current value of the row id counter to the dictionary header file
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page. */
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void
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dict_hdr_flush_row_id(void);
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/*=======================*/
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/**************************************************************************
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Gets a pointer to the dictionary header and x-latches its page. */
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UNIV_INLINE
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dict_hdr_t*
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dict_hdr_get(
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/*=========*/
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/* out: pointer to the dictionary header,
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page x-latched */
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mtr_t* mtr) /* in: mtr */
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{
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dict_hdr_t* header;
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ut_ad(mtr);
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header = DICT_HDR + buf_page_get(DICT_HDR_SPACE, DICT_HDR_PAGE_NO,
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RW_X_LATCH, mtr);
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buf_page_dbg_add_level(header, SYNC_DICT_HEADER);
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return(header);
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}
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/**************************************************************************
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Returns a new table, index, or tree id. */
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UNIV_INLINE
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dulint
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dict_hdr_get_new_id(
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/*================*/
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/* out: the new id */
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ulint type) /* in: DICT_HDR_ROW_ID, ... */
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{
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dict_hdr_t* dict_hdr;
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dulint id;
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mtr_t mtr;
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ut_ad((type == DICT_HDR_TABLE_ID) || (type == DICT_HDR_INDEX_ID)
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|| (type == DICT_HDR_MIX_ID));
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mtr_start(&mtr);
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dict_hdr = dict_hdr_get(&mtr);
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id = mtr_read_dulint(dict_hdr + type, MLOG_8BYTES, &mtr);
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id = ut_dulint_add(id, 1);
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mlog_write_dulint(dict_hdr + type, id, MLOG_8BYTES, &mtr);
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mtr_commit(&mtr);
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return(id);
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}
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/**************************************************************************
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Returns a new row id. */
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UNIV_INLINE
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dulint
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dict_sys_get_new_row_id(void)
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/*=========================*/
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/* out: the new id */
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{
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dulint id;
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mutex_enter(&(dict_sys->mutex));
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id = dict_sys->row_id;
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if (0 == (ut_dulint_get_low(id) % DICT_HDR_ROW_ID_WRITE_MARGIN)) {
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dict_hdr_flush_row_id();
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}
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UT_DULINT_INC(dict_sys->row_id);
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mutex_exit(&(dict_sys->mutex));
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return(id);
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}
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/**************************************************************************
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Reads a row id from a record or other 6-byte stored form. */
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UNIV_INLINE
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dulint
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dict_sys_read_row_id(
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/*=================*/
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/* out: row id */
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byte* field) /* in: record field */
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{
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ut_ad(DATA_ROW_ID_LEN == 6);
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return(mach_read_from_6(field));
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}
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/**************************************************************************
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Writes a row id to a record or other 6-byte stored form. */
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UNIV_INLINE
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void
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dict_sys_write_row_id(
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/*==================*/
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byte* field, /* in: record field */
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dulint row_id) /* in: row id */
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{
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ut_ad(DATA_ROW_ID_LEN == 6);
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mach_write_to_6(field, row_id);
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}
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