From a175314c3e5827eb193872241446f2f8f5c9d33c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 20:07:14 +0200 Subject: Adding upstream version 1:10.5.12. Signed-off-by: Daniel Baumann --- storage/perfschema/table_variables_by_thread.h | 151 +++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 storage/perfschema/table_variables_by_thread.h (limited to 'storage/perfschema/table_variables_by_thread.h') diff --git a/storage/perfschema/table_variables_by_thread.h b/storage/perfschema/table_variables_by_thread.h new file mode 100644 index 00000000..d628707f --- /dev/null +++ b/storage/perfschema/table_variables_by_thread.h @@ -0,0 +1,151 @@ +/* Copyright (c) 2015, 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, version 2.0, + as published by the Free Software Foundation. + + This program is also distributed with certain software (including + but not limited to OpenSSL) that is licensed under separate terms, + as designated in a particular file or component or in included license + documentation. The authors of MySQL hereby grant you an additional + permission to link the program and your derivative works with the + separately licensed software that they have included with MySQL. + + 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, version 2.0, 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 */ + +#ifndef TABLE_VARIABLES_BY_THREAD_H +#define TABLE_VARIABLES_BY_THREAD_H + +/** + @file storage/perfschema/table_variables_by_thread.h + Table VARIABLES_BY_THREAD (declarations). +*/ + +#include "pfs_column_types.h" +#include "pfs_engine_table.h" +#include "pfs_instr_class.h" +#include "pfs_instr.h" +#include "table_helper.h" +#include "pfs_variable.h" +#include "pfs_buffer_container.h" + +/** + @addtogroup Performance_schema_tables + @{ +*/ + +/** + A row of table + PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD. +*/ +struct row_variables_by_thread +{ + /** Column THREAD_ID. */ + ulonglong m_thread_internal_id; + /** Column VARIABLE_NAME. */ + PFS_variable_name_row m_variable_name; + /** Column VARIABLE_VALUE. */ + PFS_variable_value_row m_variable_value; +}; + +/** + Position of a cursor on + PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD. + Index 1 on thread (0 based) + Index 2 on system variable (0 based) +*/ +struct pos_variables_by_thread +: public PFS_double_index +{ + pos_variables_by_thread() + : PFS_double_index(0, 0) + {} + + inline void reset(void) + { + m_index_1= 0; + m_index_2= 0; + } + + inline bool has_more_thread(void) + { return (m_index_1 < global_thread_container.get_row_count()); } + + inline void next_thread(void) + { + m_index_1++; + m_index_2= 0; + } +}; + +/** + Store and retrieve table state information during queries that reinstantiate + the table object. +*/ +class table_variables_by_thread_context : public PFS_table_context +{ +public: + table_variables_by_thread_context(ulonglong hash_version, bool restore) : + PFS_table_context(hash_version, global_thread_container.get_row_count(), restore, THR_PFS_VBT) { } +}; + +/** Table PERFORMANCE_SCHEMA.VARIABLES_BY_THREAD. */ +class table_variables_by_thread : public PFS_engine_table +{ + typedef pos_variables_by_thread pos_t; + +public: + /** Table share */ + static PFS_engine_table_share m_share; + static PFS_engine_table* create(); + static ha_rows get_row_count(); + + virtual int rnd_init(bool scan); + virtual int rnd_next(); + virtual int rnd_pos(const void *pos); + virtual void reset_position(void); + +protected: + virtual int read_row_values(TABLE *table, + unsigned char *buf, + Field **fields, + bool read_all); + table_variables_by_thread(); + +public: + ~table_variables_by_thread() + {} + +protected: + int materialize(PFS_thread *thread); + void make_row(PFS_thread *thread, const System_variable *system_var); + +private: + /** Table share lock. */ + static THR_LOCK m_table_lock; + /** Fields definition. */ + static TABLE_FIELD_DEF m_field_def; + + /** Current THD variables. */ + PFS_system_variable_cache m_sysvar_cache; + /** Current row. */ + row_variables_by_thread m_row; + /** True if the current row exists. */ + bool m_row_exists; + /** Current position. */ + pos_t m_pos; + /** Next position. */ + pos_t m_next_pos; + + /** Table context with system variable hash version and map of materialized threads. */ + table_variables_by_thread_context *m_context; +}; + +/** @} */ +#endif -- cgit v1.2.3