1 files changed, 132 insertions, 0 deletions
diff --git a/storage/maria/ma_commit.c b/storage/maria/ma_commit.c
new file mode 100644
index 00000000..4bd64bfd
--- /dev/null
+++ b/storage/maria/ma_commit.c
@@ -0,0 +1,132 @@
+/* Copyright (C) 2007-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#include "maria_def.h"
+#include "trnman.h"
+#include "ma_trnman.h"
+
+/**
+   writes a COMMIT record to log and commits transaction in memory
+
+   @param  trn              transaction
+
+   @return Operation status
+     @retval 0      ok
+     @retval 1      error (disk error or out of memory)
+*/
+
+int ma_commit(TRN *trn)
+{
+  int res;
+  LSN commit_lsn;
+  LEX_CUSTRING log_array[TRANSLOG_INTERNAL_PARTS];
+  DBUG_ENTER("ma_commit");
+
+  DBUG_ASSERT(trn->rec_lsn == LSN_IMPOSSIBLE);
+  if (trn->undo_lsn == 0) /* no work done, rollback (cheaper than commit) */
+    DBUG_RETURN(trnman_rollback_trn(trn));
+  /*
+    - if COMMIT record is written before trnman_commit_trn():
+    if Checkpoint comes in the middle it will see trn is not committed,
+    then if crash, Recovery might roll back trn (if MY_MIN(rec_lsn) is after
+    COMMIT record) and this is not an issue as
+    * transaction's updates were not made visible to other transactions
+    * "commit ok" was not sent to client
+    Alternatively, Recovery might commit trn (if MY_MIN(rec_lsn) is before
+    COMMIT record), which is ok too. All in all it means that "trn committed"
+    is not 100% equal to "COMMIT record written".
+    - if COMMIT record is written after trnman_commit_trn():
+    if crash happens between the two, trn will be rolled back which is an
+    issue (transaction's updates were made visible to other transactions).
+    So we need to go the first way.
+
+    Note that we have to use | here to ensure that all calls are made.
+  */
+
+  /*
+    We do not store "thd->transaction.xid_state.xid" for now, it will be
+    needed only when we support XA.
+  */
+  res= (translog_write_record(&commit_lsn, LOGREC_COMMIT,
+                             trn, NULL, 0,
+                             sizeof(log_array)/sizeof(log_array[0]),
+                             log_array, NULL, NULL) |
+        translog_flush(commit_lsn));
+
+  DBUG_EXECUTE_IF("maria_sleep_in_commit",
+                  {
+                    DBUG_PRINT("info", ("maria_sleep_in_commit"));
+                    sleep(3);
+                  });
+  res|= trnman_commit_trn(trn);
+
+
+  /*
+    Note: if trnman_commit_trn() fails above, we have already
+    written the COMMIT record, so Checkpoint and Recovery will see the
+    transaction as committed.
+  */
+  DBUG_RETURN(res);
+}
+
+
+/**
+   Writes a COMMIT record for a transaciton associated with a file
+
+   @param  info              Maria handler
+
+   @return Operation status
+     @retval 0      ok
+     @retval #      error (disk error or out of memory)
+*/
+
+int maria_commit(MARIA_HA *info)
+{
+  TRN *trn;
+  if (!info->s->now_transactional)
+    return 0;
+  trn= info->trn;
+  _ma_reset_trn_for_table(info);
+  return ma_commit(trn);
+}
+
+
+/**
+   Starts a transaction on a file handle
+
+   @param  info              Maria handler
+
+   @return Operation status
+     @retval 0      ok
+     @retval #      Error code.
+
+   @note this can be used only in single-threaded programs (tests),
+   because we create a transaction (trnman_new_trn) with WT_THD=0.
+   XXX it needs to be fixed when we'll start using maria_begin from SQL.
+*/
+
+int maria_begin(MARIA_HA *info)
+{
+  DBUG_ENTER("maria_begin");
+
+  if (info->s->now_transactional)
+  {
+    TRN *trn= trnman_new_trn(0);
+    if (unlikely(!trn))
+      DBUG_RETURN(HA_ERR_OUT_OF_MEM);
+    _ma_set_trn_for_table(info, trn);
+  }
+  DBUG_RETURN(0);
+}