C++ (Cpp) page_cur_set_before_first Examples

Example #1

File: btr0pcur.c Project: isleon/Jaxer

void
btr_pcur_move_to_next_page(
/*=======================*/
	btr_pcur_t*	cursor,	/* in: persistent cursor; must be on the
				last record of the current page */
	mtr_t*		mtr)	/* in: mtr */
{
	ulint	next_page_no;
	ulint	space;
	page_t*	page;
	page_t*	next_page;

	ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);	
	ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
	ut_ad(btr_pcur_is_after_last_on_page(cursor, mtr));	

	cursor->old_stored = BTR_PCUR_OLD_NOT_STORED;
	
	page = btr_pcur_get_page(cursor);

	next_page_no = btr_page_get_next(page, mtr);
	space = buf_frame_get_space_id(page);

	ut_ad(next_page_no != FIL_NULL);	

	next_page = btr_page_get(space, next_page_no, cursor->latch_mode, mtr);
	ut_a(page_is_comp(next_page) == page_is_comp(page));
	buf_block_align(next_page)->check_index_page_at_flush = TRUE;

	btr_leaf_page_release(page, cursor->latch_mode, mtr);
	
	page_cur_set_before_first(next_page, btr_pcur_get_page_cur(cursor));

	page_check_dir(next_page);
}

Example #2

File: btr0pcur.c Project: MPlatform/mariadb

/*********************************************************//**
Moves the persistent cursor to the first record on the next page. Releases the
latch on the current page, and bufferunfixes it. Note that there must not be
modifications on the current page, as then the x-latch can be released only in
mtr_commit. */
UNIV_INTERN
void
btr_pcur_move_to_next_page(
/*=======================*/
	btr_pcur_t*	cursor,	/*!< in: persistent cursor; must be on the
				last record of the current page */
	mtr_t*		mtr)	/*!< in: mtr */
{
	ulint		next_page_no;
	ulint		space;
	ulint		zip_size;
	page_t*		page;
	buf_block_t*	next_block;
	page_t*		next_page;

	ut_a(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
	ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
	ut_ad(btr_pcur_is_after_last_on_page(cursor));

	cursor->old_stored = BTR_PCUR_OLD_NOT_STORED;

	page = btr_pcur_get_page(cursor);
	next_page_no = btr_page_get_next(page, mtr);
	space = buf_block_get_space(btr_pcur_get_block(cursor));
	zip_size = buf_block_get_zip_size(btr_pcur_get_block(cursor));

	ut_ad(next_page_no != FIL_NULL);

	next_block = btr_block_get(space, zip_size, next_page_no,
				   cursor->latch_mode,
				   btr_pcur_get_btr_cur(cursor)->index, mtr);
	next_page = buf_block_get_frame(next_block);

	if (srv_pass_corrupt_table && !next_page) {
		btr_leaf_page_release(btr_pcur_get_block(cursor),
				      cursor->latch_mode, mtr);
		btr_pcur_get_page_cur(cursor)->block = 0;
		btr_pcur_get_page_cur(cursor)->rec = 0;
		return;
	}
	ut_a(next_page);
#ifdef UNIV_BTR_DEBUG
	ut_a(page_is_comp(next_page) == page_is_comp(page));
	ut_a(btr_page_get_prev(next_page, mtr)
	     == buf_block_get_page_no(btr_pcur_get_block(cursor)));
#endif /* UNIV_BTR_DEBUG */
	next_block->check_index_page_at_flush = TRUE;

	btr_leaf_page_release(btr_pcur_get_block(cursor),
			      cursor->latch_mode, mtr);

	page_cur_set_before_first(next_block, btr_pcur_get_page_cur(cursor));

	page_check_dir(next_page);
}