100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
/* Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#ifndef TABLE_METADATA_LOCK_H
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#define TABLE_METADATA_LOCK_H
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/**
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@file storage/perfschema/table_md_locks.h
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Table METADATA_LOCKS (declarations).
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*/
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#include "pfs_column_types.h"
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#include "pfs_engine_table.h"
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#include "table_helper.h"
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struct PFS_metadata_lock;
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/**
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@addtogroup Performance_schema_tables
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@{
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*/
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/** A row of table PERFORMANCE_SCHEMA.MUTEX_INSTANCES. */
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struct row_metadata_lock
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{
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/** Column OBJECT_INSTANCE_BEGIN. */
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const void *m_identity;
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opaque_mdl_type m_mdl_type;
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opaque_mdl_duration m_mdl_duration;
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opaque_mdl_status m_mdl_status;
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/** Column SOURCE. */
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char m_source[COL_SOURCE_SIZE];
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/** Length in bytes of @c m_source. */
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uint m_source_length;
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/** Column OWNER_THREAD_ID. */
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ulong m_owner_thread_id;
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/** Column OWNER_EVENT_ID. */
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ulong m_owner_event_id;
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/** Columns OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME. */
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PFS_object_row m_object;
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};
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/** Table PERFORMANCE_SCHEMA.METADATA_LOCKS. */
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class table_metadata_locks : public PFS_engine_table
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{
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public:
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/** Table share. */
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static PFS_engine_table_share m_share;
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static PFS_engine_table* create();
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static ha_rows get_row_count();
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virtual int rnd_next();
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virtual int rnd_pos(const void *pos);
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virtual void reset_position(void);
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private:
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virtual int read_row_values(TABLE *table,
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unsigned char *buf,
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Field **fields,
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bool read_all);
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table_metadata_locks();
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public:
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~table_metadata_locks()
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{}
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private:
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void make_row(PFS_metadata_lock *pfs);
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/** Table share lock. */
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static THR_LOCK m_table_lock;
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/** Fields definition. */
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static TABLE_FIELD_DEF m_field_def;
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/** Current row. */
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row_metadata_lock m_row;
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/** True if the current row exists. */
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bool m_row_exists;
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/** Current position. */
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PFS_simple_index m_pos;
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/** Next position. */
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PFS_simple_index m_next_pos;
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};
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/** @} */
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#endif
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