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f8c1059cbf
include/waiting_threads.h: C_MODE_START/END mysys/waiting_threads.c: relax the checks - auto init thd in will_wait_for, allow to destroy uninited thd (=noop), allow a "release" an unexistent resource (=noop), sql/sql_class.cc: move wt* maintainance from maria to the server. do THD::cleanup after ha_close_connection() and plugin_thdvar_cleanup(). storage/maria/unittest/trnman-t.c: update to new prototype
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/* Copyright (C) 2007 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "maria_def.h"
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#include "trnman.h"
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/**
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@brief writes a COMMIT record to log and commits transaction in memory
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@param trn transaction
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@return Operation status
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@retval 0 ok
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@retval 1 error (disk error or out of memory)
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*/
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int ma_commit(TRN *trn)
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{
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int res;
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LSN commit_lsn;
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LEX_CUSTRING log_array[TRANSLOG_INTERNAL_PARTS];
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DBUG_ENTER("ma_commit");
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if (trn->undo_lsn == 0) /* no work done, rollback (cheaper than commit) */
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DBUG_RETURN(trnman_rollback_trn(trn));
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/*
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- if COMMIT record is written before trnman_commit_trn():
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if Checkpoint comes in the middle it will see trn is not committed,
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then if crash, Recovery might roll back trn (if min(rec_lsn) is after
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COMMIT record) and this is not an issue as
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* transaction's updates were not made visible to other transactions
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* "commit ok" was not sent to client
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Alternatively, Recovery might commit trn (if min(rec_lsn) is before COMMIT
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record), which is ok too. All in all it means that "trn committed" is not
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100% equal to "COMMIT record written".
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- if COMMIT record is written after trnman_commit_trn():
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if crash happens between the two, trn will be rolled back which is an
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issue (transaction's updates were made visible to other transactions).
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So we need to go the first way.
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Note that we have to use | here to ensure that all calls are made.
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*/
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/*
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We do not store "thd->transaction.xid_state.xid" for now, it will be
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needed only when we support XA.
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*/
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res= (translog_write_record(&commit_lsn, LOGREC_COMMIT,
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trn, NULL, 0,
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sizeof(log_array)/sizeof(log_array[0]),
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log_array, NULL, NULL) |
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translog_flush(commit_lsn) |
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trnman_commit_trn(trn));
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/*
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Note: if trnman_commit_trn() fails above, we have already
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written the COMMIT record, so Checkpoint and Recovery will see the
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transaction as committed.
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*/
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DBUG_RETURN(res);
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}
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/**
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@brief Writes a COMMIT record for a transaciton associated with a file
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@param info Maria handler
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@return Operation status
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@retval 0 ok
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@retval # error (disk error or out of memory)
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*/
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int maria_commit(MARIA_HA *info)
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{
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return info->s->now_transactional ? ma_commit(info->trn) : 0;
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}
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/**
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@brief Starts a transaction on a file handle
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@param info Maria handler
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@return Operation status
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@retval 0 ok
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@retval # Error code.
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*/
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int maria_begin(MARIA_HA *info)
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{
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DBUG_ENTER("maria_begin");
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if (info->s->now_transactional)
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{
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TRN *trn= trnman_new_trn(0);
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if (unlikely(!trn))
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DBUG_RETURN(HA_ERR_OUT_OF_MEM);
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DBUG_PRINT("info", ("TRN set to 0x%lx", (ulong) trn));
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info->trn= trn;
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}
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DBUG_RETURN(0);
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}
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