|
- /* Copyright (c) 2012, 2021, 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,
- 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
-
- /**
- @file storage/perfschema/table_md_locks.cc
- Table METADATA_LOCKS (implementation).
- */
-
- #include "my_global.h"
- #include "my_thread.h"
- #include "pfs_instr.h"
- #include "pfs_column_types.h"
- #include "pfs_column_values.h"
- #include "table_md_locks.h"
- #include "pfs_global.h"
- #include "pfs_buffer_container.h"
- #include "field.h"
-
- THR_LOCK table_metadata_locks::m_table_lock;
-
- static const TABLE_FIELD_TYPE field_types[]=
- {
- {
- { C_STRING_WITH_LEN("OBJECT_TYPE") },
- { C_STRING_WITH_LEN("varchar(64)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("OBJECT_SCHEMA") },
- { C_STRING_WITH_LEN("varchar(64)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("OBJECT_NAME") },
- { C_STRING_WITH_LEN("varchar(64)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("OBJECT_INSTANCE_BEGIN") },
- { C_STRING_WITH_LEN("bigint(20)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("LOCK_TYPE") },
- { C_STRING_WITH_LEN("varchar(32)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("LOCK_DURATION") },
- { C_STRING_WITH_LEN("varchar(32)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("LOCK_STATUS") },
- { C_STRING_WITH_LEN("varchar(32)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("SOURCE") },
- { C_STRING_WITH_LEN("varchar(64)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("OWNER_THREAD_ID") },
- { C_STRING_WITH_LEN("bigint(20)") },
- { NULL, 0}
- },
- {
- { C_STRING_WITH_LEN("OWNER_EVENT_ID") },
- { C_STRING_WITH_LEN("bigint(20)") },
- { NULL, 0}
- }
- };
-
- TABLE_FIELD_DEF
- table_metadata_locks::m_field_def=
- { 10, field_types };
-
- PFS_engine_table_share
- table_metadata_locks::m_share=
- {
- { C_STRING_WITH_LEN("metadata_locks") },
- &pfs_readonly_acl,
- table_metadata_locks::create,
- NULL, /* write_row */
- NULL, /* delete_all_rows */
- table_metadata_locks::get_row_count,
- sizeof(PFS_simple_index),
- &m_table_lock,
- &m_field_def,
- false, /* checked */
- false /* perpetual */
- };
-
- PFS_engine_table* table_metadata_locks::create(void)
- {
- return new table_metadata_locks();
- }
-
- ha_rows
- table_metadata_locks::get_row_count(void)
- {
- return global_mdl_container.get_row_count();
- }
-
- table_metadata_locks::table_metadata_locks()
- : PFS_engine_table(&m_share, &m_pos),
- m_row_exists(false), m_pos(0), m_next_pos(0)
- {}
-
- void table_metadata_locks::reset_position(void)
- {
- m_pos.m_index= 0;
- m_next_pos.m_index= 0;
- }
-
- int table_metadata_locks::rnd_next(void)
- {
- PFS_metadata_lock *pfs;
-
- m_pos.set_at(&m_next_pos);
- PFS_mdl_iterator it= global_mdl_container.iterate(m_pos.m_index);
- pfs= it.scan_next(& m_pos.m_index);
- if (pfs != NULL)
- {
- make_row(pfs);
- m_next_pos.set_after(&m_pos);
- return 0;
- }
-
- return HA_ERR_END_OF_FILE;
- }
-
- int table_metadata_locks::rnd_pos(const void *pos)
- {
- PFS_metadata_lock *pfs;
-
- set_position(pos);
-
- pfs= global_mdl_container.get(m_pos.m_index);
- if (pfs != NULL)
- {
- make_row(pfs);
- return 0;
- }
-
- return HA_ERR_RECORD_DELETED;
- }
-
- void table_metadata_locks::make_row(PFS_metadata_lock *pfs)
- {
- pfs_optimistic_state lock;
-
- m_row_exists= false;
-
- /* Protect this reader against a metadata lock destroy */
- pfs->m_lock.begin_optimistic_lock(&lock);
-
- m_row.m_identity= pfs->m_identity;
- m_row.m_mdl_type= pfs->m_mdl_type;
- m_row.m_mdl_duration= pfs->m_mdl_duration;
- m_row.m_mdl_status= pfs->m_mdl_status;
-
- /* Disable source file and line to avoid stale __FILE__ pointers. */
- m_row.m_source_length= 0;
-
- m_row.m_owner_thread_id= static_cast<ulong>(pfs->m_owner_thread_id);
- m_row.m_owner_event_id= static_cast<ulong>(pfs->m_owner_event_id);
-
- if (m_row.m_object.make_row(& pfs->m_mdl_key))
- return;
-
- if (pfs->m_lock.end_optimistic_lock(&lock))
- m_row_exists= true;
- }
-
- int table_metadata_locks::read_row_values(TABLE *table,
- unsigned char *buf,
- Field **fields,
- bool read_all)
- {
- Field *f;
-
- if (unlikely(! m_row_exists))
- return HA_ERR_RECORD_DELETED;
-
- /* Set the null bits */
- assert(table->s->null_bytes == 1);
- buf[0]= 0;
-
- for (; (f= *fields) ; fields++)
- {
- if (read_all || bitmap_is_set(table->read_set, f->field_index))
- {
- switch(f->field_index)
- {
- case 0: /* OBJECT_TYPE */
- case 1: /* OBJECT_SCHEMA */
- case 2: /* OBJECT_NAME */
- m_row.m_object.set_nullable_field(f->field_index, f);
- break;
- case 3: /* OBJECT_INSTANCE */
- set_field_ulonglong(f, (intptr) m_row.m_identity);
- break;
- case 4: /* LOCK_TYPE */
- set_field_mdl_type(f, m_row.m_mdl_type);
- break;
- case 5: /* LOCK_DURATION */
- set_field_mdl_duration(f, m_row.m_mdl_duration);
- break;
- case 6: /* LOCK_STATUS */
- set_field_mdl_status(f, m_row.m_mdl_status);
- break;
- case 7: /* SOURCE */
- set_field_varchar_utf8(f, m_row.m_source, m_row.m_source_length);
- break;
- case 8: /* OWNER_THREAD_ID */
- if (m_row.m_owner_thread_id != 0)
- set_field_ulonglong(f, m_row.m_owner_thread_id);
- else
- f->set_null();
- break;
- case 9: /* OWNER_EVENT_ID */
- if (m_row.m_owner_event_id != 0)
- set_field_ulonglong(f, m_row.m_owner_event_id);
- else
- f->set_null();
- break;
- default:
- assert(false);
- }
- }
- }
-
- return 0;
- }
|