diff options
Diffstat (limited to 'storage/xtradb/include/read0read.h')
| -rw-r--r-- | storage/xtradb/include/read0read.h | 67 |
1 files changed, 35 insertions, 32 deletions
diff --git a/storage/xtradb/include/read0read.h b/storage/xtradb/include/read0read.h index c6ba9557d32..e17d49b1321 100644 --- a/storage/xtradb/include/read0read.h +++ b/storage/xtradb/include/read0read.h @@ -1,6 +1,6 @@ /***************************************************************************** -Copyright (c) 1997, 2009, Innobase Oy. All Rights Reserved. +Copyright (c) 1997, 2012, Oracle and/or its affiliates. All Rights Reserved. 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 @@ -11,8 +11,8 @@ 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 St, Fifth Floor, Boston, MA 02110-1301 USA +this program; if not, write to the Free Software Foundation, Inc., +51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ @@ -31,6 +31,7 @@ Created 2/16/1997 Heikki Tuuri #include "ut0byte.h" #include "ut0lst.h" +#include "btr0types.h" #include "trx0trx.h" #include "trx0sys.h" #include "read0types.h" @@ -45,10 +46,8 @@ read_view_open_now( /*===============*/ trx_id_t cr_trx_id, /*!< in: trx_id of creating transaction, or 0 used in purge */ - read_view_t* view, /*!< in: current read view or NULL if it - doesn't exist yet */ - ibool exclude_self); /*!< in: TRUE, if cr_trx_id should be - excluded from the resulting view */ + read_view_t*& view); /*!< in,out: pre-allocated view array or + NULL if a new one needs to be created */ /*********************************************************************//** Makes a copy of the oldest existing read view, or opens a new. The view @@ -56,26 +55,29 @@ must be closed with ..._close. @return own: read view struct */ UNIV_INTERN read_view_t* -read_view_oldest_copy_or_open_new( -/*==============================*/ - trx_id_t cr_trx_id, /*!< in: trx_id of creating - transaction, or 0 used in purge */ - read_view_t* view); /*!< in: pre-allocated view array or +read_view_purge_open( +/*=================*/ + read_view_t*& clone_view, /*!< in,out: pre-allocated view that + will be used to clone the oldest view if + exists */ + read_view_t*& view); /*!< in,out: pre-allocated view array or NULL if a new one needs to be created */ /*********************************************************************//** -Closes a read view. */ -UNIV_INTERN +Remove a read view from the trx_sys->view_list. */ +UNIV_INLINE void -read_view_close( -/*============*/ - read_view_t* view); /*!< in: read view */ +read_view_remove( +/*=============*/ + read_view_t* view, /*!< in: read view, can be 0 */ + bool own_mutex); /*!< in: true if caller owns the + trx_sys_t::mutex */ /*********************************************************************//** Frees memory allocated by a read view. */ UNIV_INTERN void read_view_free( /*===========*/ - read_view_t* view); /*< in: read view */ + read_view_t*& view); /*< in,out: read view */ /*********************************************************************//** Closes a consistent read view for MySQL. This function is called at an SQL statement end if the trx isolation level is <= TRX_ISO_READ_COMMITTED. */ @@ -86,20 +88,21 @@ read_view_close_for_mysql( trx_t* trx); /*!< in: trx which has a read view */ /*********************************************************************//** Checks if a read view sees the specified transaction. -@return TRUE if sees */ +@return true if sees */ UNIV_INLINE -ibool +bool read_view_sees_trx_id( /*==================*/ const read_view_t* view, /*!< in: read view */ - trx_id_t trx_id);/*!< in: trx id */ + trx_id_t trx_id) /*!< in: trx id */ + __attribute__((nonnull, warn_unused_result)); /*********************************************************************//** -Prints a read view to stderr. */ +Prints a read view to file. */ UNIV_INTERN void read_view_print( /*============*/ - FILE* file, + FILE* file, /*!< in: file to print to */ const read_view_t* view); /*!< in: read view */ /*********************************************************************//** Create a consistent cursor view for mysql to be used in cursors. In this @@ -133,7 +136,7 @@ read_cursor_set_for_mysql( /** Read view lists the trx ids of those transactions for which a consistent read should not see the modifications to the database. */ -struct read_view_struct{ +struct read_view_t{ ulint type; /*!< VIEW_NORMAL, VIEW_HIGH_GRANULARITY */ undo_no_t undo_no;/*!< 0 or if type is VIEW_HIGH_GRANULARITY @@ -160,14 +163,14 @@ struct read_view_struct{ /*!< Maximum number of cells in the trx_ids array */ trx_id_t* descriptors; - /*!< Array of trx descriptors which the read - should not see: typically, these are the active - transactions at the time when the read is - serialized, except the reading transaction + /*!< Additional trx ids which the read should + not see: typically, these are the read-write + active transactions at the time when the read + is serialized, except the reading transaction itself; the trx ids in this array are in a - descending order. These trx_ids should be - between the "low" and "high" water marks, that - is, up_limit_id and low_limit_id. */ + ascending order. These trx_ids should be + between the "low" and "high" water marks, + that is, up_limit_id and low_limit_id. */ trx_id_t creator_trx_id; /*!< trx id of creating transaction, or 0 used in purge */ @@ -191,7 +194,7 @@ struct read_view_struct{ cursors. This struct holds both heap where consistent read view is allocated and pointer to a read view. */ -struct cursor_view_struct{ +struct cursor_view_t{ mem_heap_t* heap; /*!< Memory heap for the cursor view */ read_view_t* read_view; |