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ac028ec5d8
The latching order checks for rw-locks have not caught many bugs in the past few years and they are greatly complicating the code. Last time the debug checks were useful was in commit59caf2c3c1(MDEV-13485). The B-tree hang MDEV-14637 was not caught by LatchDebug, because the granularity of the checks is not sufficient to distinguish the levels of non-leaf B-tree pages. The interface was already made dead code by the grandparent commit03ca6495df.
64 lines
2.2 KiB
Text
64 lines
2.2 KiB
Text
/*****************************************************************************
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Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/trx0rseg.ic
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Rollback segment
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#include "srv0srv.h"
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#include "mtr0log.h"
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/** Gets a rollback segment header.
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@param[in] space space where placed
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@param[in] page_no page number of the header
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@param[in,out] mtr mini-transaction
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@return rollback segment header, page x-latched */
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UNIV_INLINE
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buf_block_t*
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trx_rsegf_get(fil_space_t* space, uint32_t page_no, mtr_t* mtr)
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{
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ut_ad(space == fil_system.sys_space || space == fil_system.temp_space
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|| srv_is_undo_tablespace(space->id)
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|| !srv_was_started);
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return buf_page_get(page_id_t(space->id, page_no),
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0, RW_X_LATCH, mtr);
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}
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/** Gets a newly created rollback segment header.
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@param[in] space space where placed
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@param[in] page_no page number of the header
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@param[in,out] mtr mini-transaction
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@return rollback segment header, page x-latched */
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UNIV_INLINE
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buf_block_t*
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trx_rsegf_get_new(
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ulint space,
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uint32_t page_no,
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mtr_t* mtr)
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{
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ut_ad(space <= srv_undo_tablespaces_active || space == SRV_TMP_SPACE_ID
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|| !srv_was_started);
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ut_ad(space <= TRX_SYS_MAX_UNDO_SPACES || space == SRV_TMP_SPACE_ID);
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return buf_page_get(page_id_t(space, page_no), 0, RW_X_LATCH, mtr);
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}
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