mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 05:22:25 +01:00
fec844aca8
Contains also:
MDEV-10549 mysqld: sql/handler.cc:2692: int handler::ha_index_first(uchar*): Assertion `table_share->tmp_table != NO_TMP_TABLE || m_lock_type != 2' failed. (branch bb-10.2-jan)
Unlike MySQL, InnoDB still uses THR_LOCK in MariaDB
MDEV-10548 Some of the debug sync waits do not work with InnoDB 5.7 (branch bb-10.2-jan)
enable tests that were fixed in MDEV-10549
MDEV-10548 Some of the debug sync waits do not work with InnoDB 5.7 (branch bb-10.2-jan)
fix main.innodb_mysql_sync - re-enable online alter for partitioned innodb tables
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/*****************************************************************************
|
|
|
|
Copyright (c) 1997, 2013, 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
|
|
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, Suite 500, Boston, MA 02110-1335 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/**************************************************//**
|
|
@file include/read0read.h
|
|
Cursor read
|
|
|
|
Created 2/16/1997 Heikki Tuuri
|
|
*******************************************************/
|
|
|
|
#ifndef read0read_h
|
|
#define read0read_h
|
|
|
|
#include "univ.i"
|
|
|
|
#include "read0types.h"
|
|
|
|
#include <algorithm>
|
|
|
|
/** The MVCC read view manager */
|
|
class MVCC {
|
|
public:
|
|
/** Constructor
|
|
@param size Number of views to pre-allocate */
|
|
explicit MVCC(ulint size);
|
|
|
|
/** Destructor.
|
|
Free all the views in the m_free list */
|
|
~MVCC();
|
|
|
|
/**
|
|
Allocate and create a view.
|
|
@param view view owned by this class created for the
|
|
caller. Must be freed by calling close()
|
|
@param trx transaction creating the view */
|
|
void view_open(ReadView*& view, trx_t* trx);
|
|
|
|
/**
|
|
Close a view created by the above function.
|
|
@para view view allocated by trx_open.
|
|
@param own_mutex true if caller owns trx_sys_t::mutex */
|
|
void view_close(ReadView*& view, bool own_mutex);
|
|
|
|
/**
|
|
Release a view that is inactive but not closed. Caller must own
|
|
the trx_sys_t::mutex.
|
|
@param view View to release */
|
|
void view_release(ReadView*& view);
|
|
|
|
/** Clones the oldest view and stores it in view. No need to
|
|
call view_close(). The caller owns the view that is passed in.
|
|
It will also move the closed views from the m_views list to the
|
|
m_free list. This function is called by Purge to create it view.
|
|
@param view Preallocated view, owned by the caller */
|
|
void clone_oldest_view(ReadView* view);
|
|
|
|
/**
|
|
@return the number of active views */
|
|
ulint size() const;
|
|
|
|
/**
|
|
@return true if the view is active and valid */
|
|
static bool is_view_active(ReadView* view)
|
|
{
|
|
ut_a(view != reinterpret_cast<ReadView*>(0x1));
|
|
|
|
return(view != NULL && !(intptr_t(view) & 0x1));
|
|
}
|
|
|
|
/**
|
|
Set the view creator transaction id. Note: This shouldbe set only
|
|
for views created by RW transactions. */
|
|
static void set_view_creator_trx_id(ReadView* view, trx_id_t id);
|
|
|
|
private:
|
|
|
|
/**
|
|
Validates a read view list. */
|
|
bool validate() const;
|
|
|
|
/**
|
|
Find a free view from the active list, if none found then allocate
|
|
a new view. This function will also attempt to move delete marked
|
|
views from the active list to the freed list.
|
|
@return a view to use */
|
|
inline ReadView* get_view();
|
|
|
|
/**
|
|
Get the oldest view in the system. It will also move the delete
|
|
marked read views from the views list to the freed list.
|
|
@return oldest view if found or NULL */
|
|
inline ReadView* get_oldest_view() const;
|
|
|
|
private:
|
|
// Prevent copying
|
|
MVCC(const MVCC&);
|
|
MVCC& operator=(const MVCC&);
|
|
|
|
private:
|
|
typedef UT_LIST_BASE_NODE_T(ReadView) view_list_t;
|
|
|
|
/** Free views ready for reuse. */
|
|
view_list_t m_free;
|
|
|
|
/** Active and closed views, the closed views will have the
|
|
creator trx id set to TRX_ID_MAX */
|
|
view_list_t m_views;
|
|
};
|
|
|
|
#endif /* read0read_h */
|