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_md_locks.cc | 207 +++++++++++++++++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 storage/perfschema/table_md_locks.cc (limited to 'storage/perfschema/table_md_locks.cc') diff --git a/storage/perfschema/table_md_locks.cc b/storage/perfschema/table_md_locks.cc new file mode 100644 index 00000000..9f78750e --- /dev/null +++ b/storage/perfschema/table_md_locks.cc @@ -0,0 +1,207 @@ +/* Copyright (c) 2012, 2018, 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, + 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; + +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, + { C_STRING_WITH_LEN("CREATE TABLE metadata_locks(" + "OBJECT_TYPE VARCHAR(64) not null," + "OBJECT_SCHEMA VARCHAR(64)," + "OBJECT_NAME VARCHAR(64)," + "OBJECT_INSTANCE_BEGIN BIGINT unsigned not null," + "LOCK_TYPE VARCHAR(32) not null," + "LOCK_DURATION VARCHAR(32) not null," + "LOCK_STATUS VARCHAR(32) not null," + "SOURCE VARCHAR(64)," + "OWNER_THREAD_ID BIGINT unsigned," + "OWNER_EVENT_ID BIGINT unsigned)")}, + 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(pfs->m_owner_thread_id); + m_row.m_owner_event_id= static_cast(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 */ + DBUG_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, m_row.m_object.m_object_type == OBJECT_TYPE_BACKUP); + 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: + DBUG_ASSERT(false); + } + } + } + + return 0; +} + -- cgit v1.2.3