byte*
mach_dulint_parse_compressed(
/*=========================*/
/* out: pointer to end of the stored field, NULL if
not complete */
byte* ptr, /* in: pointer to buffer from where to read */
byte* end_ptr,/* in: pointer to end of the buffer */
dulint* val) /* out: read value */
{
ulint high;
ulint low;
ulint size;
ut_ad(ptr && end_ptr && val);
if (end_ptr < ptr + 5) {
return(NULL);
}
high = mach_read_compressed(ptr);
size = mach_get_compressed_size(high);
ptr += size;
if (end_ptr < ptr + 4) {
return(NULL);
}
low = mach_read_from_4(ptr);
*val = ut_dulint_create(high, low);
return(ptr + 4);
}
read_view_t*
read_view_open_now(
/*===============*/
/* out, own: read view struct */
dulint cr_trx_id, /* in: trx_id of creating
transaction, or (0, 0) used in
purge */
mem_heap_t* heap) /* in: memory heap from which
allocated */
{
read_view_t* view;
trx_t* trx;
ulint n;
ut_ad(mutex_own(&kernel_mutex));
view = read_view_create_low(UT_LIST_GET_LEN(trx_sys->trx_list), heap);
view->creator_trx_id = cr_trx_id;
view->type = VIEW_NORMAL;
view->undo_no = ut_dulint_create(0, 0);
/* No future transactions should be visible in the view */
view->low_limit_no = trx_sys->max_trx_id;
view->low_limit_id = view->low_limit_no;
n = 0;
trx = UT_LIST_GET_FIRST(trx_sys->trx_list);
/* No active transaction should be visible, except cr_trx */
while (trx) {
if (ut_dulint_cmp(trx->id, cr_trx_id) != 0
&& (trx->conc_state == TRX_ACTIVE
|| trx->conc_state == TRX_PREPARED)) {
read_view_set_nth_trx_id(view, n, trx->id);
n++;
/* NOTE that a transaction whose trx number is <
trx_sys->max_trx_id can still be active, if it is
in the middle of its commit! Note that when a
transaction starts, we initialize trx->no to
ut_dulint_max. */
if (ut_dulint_cmp(view->low_limit_no, trx->no) > 0) {
view->low_limit_no = trx->no;
}
}
trx = UT_LIST_GET_NEXT(trx_list, trx);
}
view->n_trx_ids = n;
if (n > 0) {
/* The last active transaction has the smallest id: */
view->up_limit_id = read_view_get_nth_trx_id(view, n - 1);
} else {
view->up_limit_id = view->low_limit_id;
}
UT_LIST_ADD_FIRST(view_list, trx_sys->view_list, view);
return(view);
}
read_view_t*
read_view_oldest_copy_or_open_new(
/*==============================*/
/* out, own: read view struct */
dulint cr_trx_id, /* in: trx_id of creating
transaction, or (0, 0) used in purge*/
mem_heap_t* heap) /* in: memory heap from which
allocated */
{
read_view_t* old_view;
read_view_t* view_copy;
ibool needs_insert = TRUE;
ulint insert_done = 0;
ulint n;
ulint i;
ut_ad(mutex_own(&kernel_mutex));
old_view = UT_LIST_GET_LAST(trx_sys->view_list);
if (old_view == NULL) {
return(read_view_open_now(cr_trx_id, heap));
}
n = old_view->n_trx_ids;
if (ut_dulint_cmp(old_view->creator_trx_id,
ut_dulint_create(0,0)) != 0) {
n++;
} else {
needs_insert = FALSE;
}
view_copy = read_view_create_low(n, heap);
/* Insert the id of the creator in the right place of the descending
array of ids, if needs_insert is TRUE: */
i = 0;
while (i < n) {
if (needs_insert
&& (i >= old_view->n_trx_ids
|| ut_dulint_cmp(old_view->creator_trx_id,
read_view_get_nth_trx_id(old_view, i))
> 0)) {
read_view_set_nth_trx_id(view_copy, i,
old_view->creator_trx_id);
needs_insert = FALSE;
insert_done = 1;
} else {
read_view_set_nth_trx_id(view_copy, i,
read_view_get_nth_trx_id(
old_view,
i - insert_done));
}
i++;
}
view_copy->creator_trx_id = cr_trx_id;
view_copy->low_limit_no = old_view->low_limit_no;
view_copy->low_limit_id = old_view->low_limit_id;
if (n > 0) {
/* The last active transaction has the smallest id: */
view_copy->up_limit_id = read_view_get_nth_trx_id(
view_copy, n - 1);
} else {
view_copy->up_limit_id = old_view->up_limit_id;
}
UT_LIST_ADD_LAST(view_list, trx_sys->view_list, view_copy);
return(view_copy);
}
/*****************************************************************//**
Creates the file page for the dictionary header. This function is
called only at the database creation.
@return TRUE if succeed */
static
ibool
dict_hdr_create(
/*============*/
mtr_t* mtr) /*!< in: mtr */
{
buf_block_t* block;
dict_hdr_t* dict_header;
ulint root_page_no;
ut_ad(mtr);
/* Create the dictionary header file block in a new, allocated file
segment in the system tablespace */
block = fseg_create(DICT_HDR_SPACE, 0,
DICT_HDR + DICT_HDR_FSEG_HEADER, mtr);
ut_a(DICT_HDR_PAGE_NO == buf_block_get_page_no(block));
dict_header = dict_hdr_get(mtr);
/* Start counting row, table, index, and tree ids from
DICT_HDR_FIRST_ID */
mlog_write_dulint(dict_header + DICT_HDR_ROW_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
mlog_write_dulint(dict_header + DICT_HDR_TABLE_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
mlog_write_dulint(dict_header + DICT_HDR_INDEX_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
/* Obsolete, but we must initialize it to 0 anyway. */
mlog_write_dulint(dict_header + DICT_HDR_MIX_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
/* Create the B-tree roots for the clustered indexes of the basic
system tables */
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_TABLES_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_TABLES, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_UNIQUE, DICT_HDR_SPACE, 0,
DICT_TABLE_IDS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_TABLE_IDS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_COLUMNS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_COLUMNS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_INDEXES_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_INDEXES, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_FIELDS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_FIELDS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
return(TRUE);
}
