1 files changed, 116 insertions, 0 deletions
diff --git a/storage/maria/ma_trnman.h b/storage/maria/ma_trnman.h
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+++ b/storage/maria/ma_trnman.h
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+/* Copyright (C) 2006-2008 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 */
+
+#ifndef _ma_trnman_h
+#define _ma_trnman_h
+
+/**
+   Sets table's trn and prints debug information
+   Links table into new_trn->used_instances
+
+   @param tbl              MARIA_HA of table
+   @param newtrn           what to put into tbl->trn
+*/
+
+static inline void _ma_set_trn_for_table(MARIA_HA *tbl, TRN *newtrn)
+{
+  DBUG_PRINT("info",("table: %p  trn: %p -> %p",
+                     tbl, tbl->trn, newtrn));
+
+  /* check that we are not calling this twice in a row */
+  DBUG_ASSERT(newtrn->used_instances != (void*) tbl);
+
+  tbl->trn= newtrn;
+  /* Link into used list */
+  if (newtrn->used_instances)
+    ((MARIA_HA*) newtrn->used_instances)->trn_prev= &tbl->trn_next;
+  tbl->trn_next= (MARIA_HA*) newtrn->used_instances;
+  tbl->trn_prev= (MARIA_HA**) &newtrn->used_instances;
+  newtrn->used_instances= tbl;
+}
+
+
+/*
+  Same as _ma_set_trn_for_table(), but don't link table into used_instance list
+  Used when we want to temporary set trn for a table in extra()
+*/ 
+
+static inline void _ma_set_tmp_trn_for_table(MARIA_HA *tbl, TRN *newtrn)
+{
+  DBUG_PRINT("info",("table: %p  trn: %p -> %p",
+                     tbl, tbl->trn, newtrn));
+  tbl->trn= newtrn;
+  tbl->trn_prev= 0;
+  tbl->trn_next= 0;               /* To avoid assert in ha_maria::close() */
+}
+
+
+/*
+  Reset TRN in table
+*/
+
+static inline void _ma_reset_trn_for_table(MARIA_HA *tbl)
+{
+  DBUG_PRINT("info",("table: %p  trn: %p -> NULL", tbl, tbl->trn));
+
+  /* The following is only false if tbl->trn == &dummy_transaction_object */
+  if (tbl->trn_prev)
+  {
+    if (tbl->trn_next)
+      tbl->trn_next->trn_prev= tbl->trn_prev;
+    *tbl->trn_prev= tbl->trn_next;
+    tbl->trn_prev= 0;
+    tbl->trn_next= 0;
+  }
+  tbl->trn= 0;
+}
+
+
+/*
+  Take over the used_instances link from a trn object
+  Reset the link in the trn object
+*/
+
+static inline void relink_trn_used_instances(MARIA_HA **used_tables, TRN *trn)
+{
+  if (likely(*used_tables= (MARIA_HA*) trn->used_instances))
+  {
+    /* Check that first back link is correct */
+    DBUG_ASSERT((*used_tables)->trn_prev == (MARIA_HA **)&trn->used_instances);
+
+    /* Fix back link to point to new base for the list */
+    (*used_tables)->trn_prev= used_tables;
+    trn->used_instances= 0;
+  }
+}
+
+/**
+  When we want to check a table, we verify that the transaction ids of rows
+  and keys are not bigger than the biggest id generated by Maria so far, which
+  is returned by the function below.
+
+  @note If control file is not open, 0 may be returned; to not confuse
+  this with a valid max trid of 0, the caller should notice that it failed to
+  open the control file (ma_control_file_inited() can serve for that).
+*/
+
+static inline TrID max_trid_in_system(void)
+{
+  TrID id= trnman_get_max_trid(); /* 0 if transac manager not initialized */
+  /* 'id' may be far bigger, if last shutdown is old */
+  return MY_MAX(id, max_trid_in_control_file);
+}
+
+#endif /* _ma_trnman_h */