1 /* Copyright (c) 2013, 2021, Oracle and/or its affiliates. 2 3 This program is free software; you can redistribute it and/or modify 4 it under the terms of the GNU General Public License, version 2.0, 5 as published by the Free Software Foundation. 6 7 This program is also distributed with certain software (including 8 but not limited to OpenSSL) that is licensed under separate terms, 9 as designated in a particular file or component or in included license 10 documentation. The authors of MySQL hereby grant you an additional 11 permission to link the program and your derivative works with the 12 separately licensed software that they have included with MySQL. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License, version 2.0, for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ 22 23 #ifndef TABLE_UVAR_BY_THREAD_H 24 #define TABLE_UVAR_BY_THREAD_H 25 26 /** 27 @file storage/perfschema/table_uvar_by_thread.h 28 Table USER_VARIABLES_BY_THREAD (declarations). 29 */ 30 31 #include "pfs_column_types.h" 32 #include "pfs_engine_table.h" 33 #include "pfs_instr_class.h" 34 #include "pfs_instr.h" 35 #include "table_helper.h" 36 37 /** 38 @addtogroup Performance_schema_tables 39 @{ 40 */ 41 42 struct User_variable 43 { 44 public: User_variableUser_variable45 User_variable() 46 {} 47 User_variableUser_variable48 User_variable(const User_variable& uv) 49 : m_name(uv.m_name), m_value(uv.m_value) 50 {} 51 ~User_variableUser_variable52 ~User_variable() 53 {} 54 55 PFS_variable_name_row m_name; 56 PFS_user_variable_value_row m_value; 57 }; 58 59 class User_variables 60 { 61 typedef Prealloced_array<User_variable, 100, false> User_variable_array; 62 63 public: User_variables()64 User_variables() 65 : m_pfs(NULL), m_thread_internal_id(0), m_array(PSI_INSTRUMENT_ME) 66 { 67 } 68 reset()69 void reset() 70 { 71 m_pfs= NULL; 72 m_thread_internal_id= 0; 73 m_array.clear(); 74 } 75 76 void materialize(PFS_thread *pfs, THD *thd); 77 is_materialized(PFS_thread * pfs)78 bool is_materialized(PFS_thread *pfs) 79 { 80 assert(pfs != NULL); 81 if (m_pfs != pfs) 82 return false; 83 if (m_thread_internal_id != pfs->m_thread_internal_id) 84 return false; 85 return true; 86 } 87 get(uint index)88 const User_variable *get(uint index) const 89 { 90 if (index >= m_array.size()) 91 return NULL; 92 93 const User_variable *p= & m_array.at(index); 94 return p; 95 } 96 97 private: 98 PFS_thread *m_pfs; 99 ulonglong m_thread_internal_id; 100 User_variable_array m_array; 101 }; 102 103 /** 104 A row of table 105 PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. 106 */ 107 struct row_uvar_by_thread 108 { 109 /** Column THREAD_ID. */ 110 ulonglong m_thread_internal_id; 111 /** Column VARIABLE_NAME. */ 112 const PFS_variable_name_row *m_variable_name; 113 /** Column VARIABLE_VALUE. */ 114 const PFS_user_variable_value_row *m_variable_value; 115 }; 116 117 /** 118 Position of a cursor on 119 PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. 120 Index 1 on thread (0 based) 121 Index 2 on user variable (0 based) 122 */ 123 struct pos_uvar_by_thread 124 : public PFS_double_index 125 { pos_uvar_by_threadpos_uvar_by_thread126 pos_uvar_by_thread() 127 : PFS_double_index(0, 0) 128 {} 129 resetpos_uvar_by_thread130 inline void reset(void) 131 { 132 m_index_1= 0; 133 m_index_2= 0; 134 } 135 next_threadpos_uvar_by_thread136 inline void next_thread(void) 137 { 138 m_index_1++; 139 m_index_2= 0; 140 } 141 }; 142 143 /** Table PERFORMANCE_SCHEMA.USER_VARIABLES_BY_THREAD. */ 144 class table_uvar_by_thread : public PFS_engine_table 145 { 146 typedef pos_uvar_by_thread pos_t; 147 148 public: 149 /** Table share */ 150 static PFS_engine_table_share m_share; 151 static PFS_engine_table* create(); 152 static ha_rows get_row_count(); 153 154 virtual int rnd_next(); 155 virtual int rnd_pos(const void *pos); 156 virtual void reset_position(void); 157 158 protected: 159 virtual int read_row_values(TABLE *table, 160 unsigned char *buf, 161 Field **fields, 162 bool read_all); 163 164 table_uvar_by_thread(); 165 166 public: ~table_uvar_by_thread()167 ~table_uvar_by_thread() 168 { m_THD_cache.reset(); } 169 170 protected: 171 int materialize(PFS_thread *thread); 172 void make_row(PFS_thread *thread, const User_variable *uvar); 173 174 private: 175 /** Table share lock. */ 176 static THR_LOCK m_table_lock; 177 /** Fields definition. */ 178 static TABLE_FIELD_DEF m_field_def; 179 180 /** Current THD user variables. */ 181 User_variables m_THD_cache; 182 /** Current row. */ 183 row_uvar_by_thread m_row; 184 /** True is the current row exists. */ 185 bool m_row_exists; 186 /** Current position. */ 187 pos_t m_pos; 188 /** Next position. */ 189 pos_t m_next_pos; 190 }; 191 192 /** @} */ 193 #endif 194