diff options
Diffstat (limited to 'storage/perfschema/cursor_by_thread_connect_attr.cc')
-rw-r--r-- | storage/perfschema/cursor_by_thread_connect_attr.cc | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/storage/perfschema/cursor_by_thread_connect_attr.cc b/storage/perfschema/cursor_by_thread_connect_attr.cc new file mode 100644 index 00000000..b4462a8d --- /dev/null +++ b/storage/perfschema/cursor_by_thread_connect_attr.cc @@ -0,0 +1,92 @@ +/* Copyright (c) 2008, 2015, 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, Fifth Floor, Boston, MA 02110-1335 USA */ + +#include "my_global.h" +#include "cursor_by_thread_connect_attr.h" +#include "pfs_buffer_container.h" + +ha_rows +cursor_by_thread_connect_attr::get_row_count(void) +{ + /* + The real number of attributes per thread does not matter, + we only need to hint the optimizer there are many per thread, + so abusing session_connect_attrs_size_per_thread + (which is a number of bytes, not attributes) + */ + return global_thread_container.get_row_count() * + session_connect_attrs_size_per_thread; +} + +cursor_by_thread_connect_attr::cursor_by_thread_connect_attr( + const PFS_engine_table_share *share) : + PFS_engine_table(share, &m_pos), m_row_exists(false) +{} + +int cursor_by_thread_connect_attr::rnd_next(void) +{ + PFS_thread *thread; + bool has_more_thread= true; + + for (m_pos.set_at(&m_next_pos); + has_more_thread; + m_pos.next_thread()) + { + thread= global_thread_container.get(m_pos.m_index_1, & has_more_thread); + if (thread != NULL) + { + make_row(thread, m_pos.m_index_2); + if (m_row_exists) + { + m_next_pos.set_after(&m_pos); + return 0; + } + } + } + + return HA_ERR_END_OF_FILE; +} + + +int cursor_by_thread_connect_attr::rnd_pos(const void *pos) +{ + PFS_thread *thread; + + set_position(pos); + + thread= global_thread_container.get(m_pos.m_index_1); + if (thread != NULL) + { + make_row(thread, m_pos.m_index_2); + if (m_row_exists) + return 0; + } + + return HA_ERR_RECORD_DELETED; +} + + +void cursor_by_thread_connect_attr::reset_position(void) +{ + m_pos.reset(); + m_next_pos.reset(); +} |