diff options
| -rw-r--r-- | sql/mysql_priv.h | 2 | ||||
| -rw-r--r-- | sql/sql_base.cc | 84 | ||||
| -rw-r--r-- | sql/sql_prepare.cc | 2 | ||||
| -rw-r--r-- | sql/sql_update.cc | 4 |
4 files changed, 31 insertions, 61 deletions
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h index ca2cda0f7c6..6908f2b9049 100644 --- a/sql/mysql_priv.h +++ b/sql/mysql_priv.h @@ -981,7 +981,7 @@ void free_io_cache(TABLE *entry); void intern_close_table(TABLE *entry); bool close_thread_table(THD *thd, TABLE **table_ptr); void close_temporary_tables(THD *thd); -void close_tables_for_reopen(THD *thd, TABLE_LIST *tables); +void close_tables_for_reopen(THD *thd, TABLE_LIST **tables); TABLE_LIST *find_table_in_list(TABLE_LIST *table, uint offset_to_list, const char *db_name, diff --git a/sql/sql_base.cc b/sql/sql_base.cc index 9d1720cc527..37d4c80a0d0 100644 --- a/sql/sql_base.cc +++ b/sql/sql_base.cc @@ -1982,22 +1982,11 @@ int open_tables(THD *thd, TABLE_LIST **start, uint *counter, uint flags) statement for which table list for prelocking is already built, let us cache routines and try to build such table list. - NOTE: We can't delay prelocking until we will met some sub-statement - which really uses tables, since this will imply that we have to restore - its table list to be able execute it in some other context. - And current views implementation assumes that view tables are added to - global table list only once during PS preparing/first SP execution. - Also locking at earlier stage is probably faster altough may decrease - concurrency a bit. - NOTE: We will mark statement as requiring prelocking only if we will have non empty table list. But this does not guarantee that in prelocked mode we will have some locked tables, because queries which use only derived/information schema tables and views possible. Thus "counter" may be still zero for prelocked statement... - - NOTE: The above notes may be out of date. Please wait for psergey to - document new prelocked behavior. */ if (!thd->prelocked_mode && !thd->lex->requires_prelocking() && @@ -2083,48 +2072,23 @@ int open_tables(THD *thd, TABLE_LIST **start, uint *counter, uint flags) if (refresh) // Refresh in progress { - /* close all 'old' tables used by this thread */ - pthread_mutex_lock(&LOCK_open); - // if query_id is not reset, we will get an error - // re-opening a temp table - thd->version=refresh_version; - TABLE **prev_table= &thd->open_tables; - bool found=0; - for (TABLE_LIST *tmp= *start; tmp; tmp= tmp->next_global) - { - /* Close normal (not temporary) changed tables */ - if (tmp->table && ! tmp->table->s->tmp_table) - { - if (tmp->table->s->version != refresh_version || - ! tmp->table->db_stat) - { - VOID(hash_delete(&open_cache,(byte*) tmp->table)); - tmp->table=0; - found=1; - } - else - { - *prev_table= tmp->table; // Relink open list - prev_table= &tmp->table->next; - } - } - } - *prev_table=0; - pthread_mutex_unlock(&LOCK_open); - if (found) - VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh /* - Let us prepare for recalculation of set of prelocked tables. - First we pretend that we have finished calculation which we - were doing currently. Then we restore list of tables to be - opened and set of used routines to the state in which they were - before first open_tables() call for this statement (i.e. before - we have calculated current set of tables for prelocking). + We have met name-locked or old version of table. Now we have + to close all tables which are not up to date. We also have to + throw away set of prelocked tables (and thus close tables from + this set that were open by now) since it possible that one of + tables which determined its content was changed. + + Instead of implementing complex/non-robust logic mentioned + above we simply close and then reopen all tables. + + In order to prepare for recalculation of set of prelocked tables + we pretend that we have finished calculation which we were doing + currently. */ if (query_tables_last_own) thd->lex->mark_as_requiring_prelocking(query_tables_last_own); - thd->lex->chop_off_not_own_tables(); - sp_remove_not_own_routines(thd->lex); + close_tables_for_reopen(thd, start); goto restart; } result= -1; // Fatal error @@ -2335,7 +2299,7 @@ int simple_open_n_lock_tables(THD *thd, TABLE_LIST *tables) break; if (!need_reopen) DBUG_RETURN(-1); - close_tables_for_reopen(thd, tables); + close_tables_for_reopen(thd, &tables); } DBUG_RETURN(0); } @@ -2372,7 +2336,7 @@ bool open_and_lock_tables(THD *thd, TABLE_LIST *tables) break; if (!need_reopen) DBUG_RETURN(-1); - close_tables_for_reopen(thd, tables); + close_tables_for_reopen(thd, &tables); } if (mysql_handle_derived(thd->lex, &mysql_derived_prepare) || (thd->fill_derived_tables() && @@ -2600,18 +2564,24 @@ int lock_tables(THD *thd, TABLE_LIST *tables, uint count, bool *need_reopen) SYNOPSIS close_tables_for_reopen() - thd Thread context - tables List of tables which we were trying to open and lock + thd in Thread context + tables in/out List of tables which we were trying to open and lock */ -void close_tables_for_reopen(THD *thd, TABLE_LIST *tables) +void close_tables_for_reopen(THD *thd, TABLE_LIST **tables) { + /* + If table list consists only from tables from prelocking set, table list + for new attempt should be empty, so we have to update list's root pointer. + */ + if (thd->lex->first_not_own_table() == *tables) + *tables= 0; thd->lex->chop_off_not_own_tables(); sp_remove_not_own_routines(thd->lex); - for (TABLE_LIST *tmp= tables; tmp; tmp= tmp->next_global) - if (tmp->table && !tmp->table->s->tmp_table) - tmp->table= 0; + for (TABLE_LIST *tmp= *tables; tmp; tmp= tmp->next_global) + tmp->table= 0; + mark_used_tables_as_free_for_reuse(thd, thd->temporary_tables); close_thread_tables(thd); } diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc index 68f033f78fe..b0c4cef6e87 100644 --- a/sql/sql_prepare.cc +++ b/sql/sql_prepare.cc @@ -1135,7 +1135,7 @@ static int mysql_test_update(Prepared_statement *stmt, break; if (!need_reopen) goto error; - close_tables_for_reopen(thd, table_list); + close_tables_for_reopen(thd, &table_list); } /* diff --git a/sql/sql_update.cc b/sql/sql_update.cc index 2ff8a4bc244..324623a61ca 100644 --- a/sql/sql_update.cc +++ b/sql/sql_update.cc @@ -158,7 +158,7 @@ int mysql_update(THD *thd, break; if (!need_reopen) DBUG_RETURN(1); - close_tables_for_reopen(thd, table_list); + close_tables_for_reopen(thd, &table_list); } if (mysql_handle_derived(thd->lex, &mysql_derived_prepare) || @@ -813,7 +813,7 @@ reopen_tables: for (TABLE_LIST *tbl= table_list; tbl; tbl= tbl->next_global) tbl->cleanup_items(); - close_tables_for_reopen(thd, table_list); + close_tables_for_reopen(thd, &table_list); goto reopen_tables; } |