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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:00:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:00:34 +0000 |
commit | 3f619478f796eddbba6e39502fe941b285dd97b1 (patch) | |
tree | e2c7b5777f728320e5b5542b6213fd3591ba51e2 /storage/perfschema/table_uvar_by_thread.h | |
parent | Initial commit. (diff) | |
download | mariadb-3f619478f796eddbba6e39502fe941b285dd97b1.tar.xz mariadb-3f619478f796eddbba6e39502fe941b285dd97b1.zip |
Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'storage/perfschema/table_uvar_by_thread.h')
-rw-r--r-- | storage/perfschema/table_uvar_by_thread.h | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/storage/perfschema/table_uvar_by_thread.h b/storage/perfschema/table_uvar_by_thread.h new file mode 100644 index 00000000..61c52106 --- /dev/null +++ b/storage/perfschema/table_uvar_by_thread.h @@ -0,0 +1,196 @@ +/* Copyright (c) 2013, 2023, Oracle and/or its affiliates. + + 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_UVAR_BY_THREAD_H +#define TABLE_UVAR_BY_THREAD_H + +/** + @file storage/perfschema/table_uvar_by_thread.h + Table USER_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" + +/** + @addtogroup Performance_schema_tables + @{ +*/ + +struct User_variable +{ +public: + User_variable() + {} + + User_variable(const User_variable& uv) + : m_name(uv.m_name), m_value(uv.m_value) + {} + + ~User_variable() + {} + + PFS_variable_name_row m_name; + PFS_user_variable_value_row m_value; +}; + +class User_variables +{ + typedef Dynamic_array<User_variable> User_variable_array; + +public: + User_variables() + : m_pfs(NULL), m_thread_internal_id(0), m_array(PSI_INSTRUMENT_MEM) + { + } + + void reset() + { + m_pfs= NULL; + m_thread_internal_id= 0; + for (uint i=0; i < m_array.elements(); i++) + m_array.at(i).~User_variable(); + m_array.clear(); + } + + void materialize(PFS_thread *pfs, THD *thd); + + bool is_materialized(PFS_thread *pfs) + { + assert(pfs != NULL); + if (m_pfs != pfs) + return false; + if (m_thread_internal_id != pfs->m_thread_internal_id) + return false; + return true; + } + + const User_variable *get(uint index) const + { + if (index >= m_array.elements()) + return NULL; + + const User_variable *p= & m_array.at(index); + return p; + } + +private: + PFS_thread *m_pfs; + ulonglong m_thread_internal_id; + User_variable_array m_array; +}; + +/** + A row of table + PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. +*/ +struct row_uvar_by_thread +{ + /** Column THREAD_ID. */ + ulonglong m_thread_internal_id; + /** Column VARIABLE_NAME. */ + const PFS_variable_name_row *m_variable_name; + /** Column VARIABLE_VALUE. */ + const PFS_user_variable_value_row *m_variable_value; +}; + +/** + Position of a cursor on + PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. + Index 1 on thread (0 based) + Index 2 on user variable (0 based) +*/ +struct pos_uvar_by_thread +: public PFS_double_index +{ + pos_uvar_by_thread() + : PFS_double_index(0, 0) + {} + + inline void reset(void) + { + m_index_1= 0; + m_index_2= 0; + } + + inline void next_thread(void) + { + m_index_1++; + m_index_2= 0; + } +}; + +/** Table PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. */ +class table_uvar_by_thread : public PFS_engine_table +{ + typedef pos_uvar_by_thread pos_t; + +public: + static PFS_engine_table_share_state m_share_state; + /** Table share */ + static PFS_engine_table_share m_share; + static PFS_engine_table* create(); + static ha_rows get_row_count(); + + 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_uvar_by_thread(); + +public: + ~table_uvar_by_thread() + { m_THD_cache.reset(); } + +protected: + int materialize(PFS_thread *thread); + void make_row(PFS_thread *thread, const User_variable *uvar); + +private: + /** Table share lock. */ + static THR_LOCK m_table_lock; + /** Fields definition. */ + static TABLE_FIELD_DEF m_field_def; + + /** Current THD user variables. */ + User_variables m_THD_cache; + /** Current row. */ + row_uvar_by_thread m_row; + /** True is the current row exists. */ + bool m_row_exists; + /** Current position. */ + pos_t m_pos; + /** Next position. */ + pos_t m_next_pos; +}; + +/** @} */ +#endif |