diff options
Diffstat (limited to 'storage/perfschema/table_file_instances.cc')
| -rw-r--r-- | storage/perfschema/table_file_instances.cc | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/storage/perfschema/table_file_instances.cc b/storage/perfschema/table_file_instances.cc new file mode 100644 index 00000000..5af6f055 --- /dev/null +++ b/storage/perfschema/table_file_instances.cc @@ -0,0 +1,180 @@ +/* Copyright (c) 2008, 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, + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +/** + @file storage/perfschema/table_file_instances.cc + Table FILE_INSTANCES (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_file_instances.h" +#include "pfs_global.h" +#include "pfs_buffer_container.h" +#include "field.h" + +THR_LOCK table_file_instances::m_table_lock; +PFS_engine_table_share_state +table_file_instances::m_share_state = { + false /* m_checked */ +}; + +PFS_engine_table_share +table_file_instances::m_share= +{ + { C_STRING_WITH_LEN("file_instances") }, + &pfs_readonly_acl, + table_file_instances::create, + NULL, /* write_row */ + NULL, /* delete_all_rows */ + table_file_instances::get_row_count, + sizeof(PFS_simple_index), + &m_table_lock, + { C_STRING_WITH_LEN("CREATE TABLE file_instances(" + "FILE_NAME VARCHAR(512) not null comment 'File name.'," + "EVENT_NAME VARCHAR(128) not null comment 'Instrument name associated with the file.'," + "OPEN_COUNT INTEGER unsigned not null comment 'Open handles on the file. A value of greater than zero means that the file is currently open.')") }, + false, /* m_perpetual */ + false, /* m_optional */ + &m_share_state +}; + +PFS_engine_table* table_file_instances::create(void) +{ + return new table_file_instances(); +} + +ha_rows +table_file_instances::get_row_count(void) +{ + return global_file_container.get_row_count(); +} + +table_file_instances::table_file_instances() + : PFS_engine_table(&m_share, &m_pos), + m_row_exists(false), m_pos(0), m_next_pos(0) +{} + +void table_file_instances::reset_position(void) +{ + m_pos.m_index= 0; + m_next_pos.m_index= 0; +} + +int table_file_instances::rnd_next(void) +{ + PFS_file *pfs; + + m_pos.set_at(&m_next_pos); + PFS_file_iterator it= global_file_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_file_instances::rnd_pos(const void *pos) +{ + PFS_file *pfs; + + set_position(pos); + + pfs= global_file_container.get(m_pos.m_index); + if (pfs != NULL) + { + make_row(pfs); + return 0; + } + + return HA_ERR_RECORD_DELETED; +} + +void table_file_instances::make_row(PFS_file *pfs) +{ + pfs_optimistic_state lock; + PFS_file_class *safe_class; + + m_row_exists= false; + + /* Protect this reader against a file delete */ + pfs->m_lock.begin_optimistic_lock(&lock); + + safe_class= sanitize_file_class(pfs->m_class); + if (unlikely(safe_class == NULL)) + return; + + m_row.m_filename= pfs->m_filename; + m_row.m_filename_length= pfs->m_filename_length; + m_row.m_event_name= safe_class->m_name; + m_row.m_event_name_length= safe_class->m_name_length; + m_row.m_open_count= pfs->m_file_stat.m_open_count; + + if (pfs->m_lock.end_optimistic_lock(&lock)) + m_row_exists= true; +} + +int table_file_instances::read_row_values(TABLE *table, + unsigned char *, + 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 == 0); + + for (; (f= *fields) ; fields++) + { + if (read_all || bitmap_is_set(table->read_set, f->field_index)) + { + switch(f->field_index) + { + case 0: /* FILENAME */ + set_field_varchar_utf8(f, m_row.m_filename, m_row.m_filename_length); + break; + case 1: /* EVENT_NAME */ + set_field_varchar_utf8(f, m_row.m_event_name, + m_row.m_event_name_length); + break; + case 2: /* OPEN_COUNT */ + set_field_ulong(f, m_row.m_open_count); + break; + default: + assert(false); + } + } + } + + return 0; +} + |