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/* Copyright (c) 2008, 2010, 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 as published by
the Free Software Foundation; version 2 of the License.
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 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_threads.cc
Table THREADS (implementation).
*/
#include "my_global.h"
#include "my_pthread.h"
#include "table_threads.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
THR_LOCK table_threads::m_table_lock;
static const TABLE_FIELD_TYPE field_types[]=
{
{
{ C_STRING_WITH_LEN("THREAD_ID") },
{ C_STRING_WITH_LEN("int(11)") },
{ NULL, 0}
},
{
{ C_STRING_WITH_LEN("PROCESSLIST_ID") },
{ C_STRING_WITH_LEN("int(11)") },
{ NULL, 0}
},
{
{ C_STRING_WITH_LEN("NAME") },
{ C_STRING_WITH_LEN("varchar(128)") },
{ NULL, 0}
}
};
TABLE_FIELD_DEF
table_threads::m_field_def=
{ 3, field_types };
PFS_engine_table_share
table_threads::m_share=
{
{ C_STRING_WITH_LEN("threads") },
&pfs_readonly_acl,
&table_threads::create,
NULL, /* write_row */
NULL, /* delete_all_rows */
1000, /* records */
sizeof(PFS_simple_index), /* ref length */
&m_table_lock,
&m_field_def,
false /* checked */
};
PFS_engine_table* table_threads::create(void)
{
return new table_threads();
}
table_threads::table_threads()
: PFS_engine_table(&m_share, &m_pos),
m_row_exists(false), m_pos(0), m_next_pos(0)
{}
void table_threads::reset_position(void)
{
m_pos.m_index= 0;
m_next_pos.m_index= 0;
}
int table_threads::rnd_next(void)
{
PFS_thread *pfs;
for (m_pos.set_at(&m_next_pos);
m_pos.m_index < thread_max;
m_pos.next())
{
pfs= &thread_array[m_pos.m_index];
if (pfs->m_lock.is_populated())
{
make_row(pfs);
m_next_pos.set_after(&m_pos);
return 0;
}
}
return HA_ERR_END_OF_FILE;
}
int table_threads::rnd_pos(const void *pos)
{
PFS_thread *pfs;
set_position(pos);
DBUG_ASSERT(m_pos.m_index < thread_max);
pfs= &thread_array[m_pos.m_index];
if (pfs->m_lock.is_populated())
{
make_row(pfs);
return 0;
}
return HA_ERR_RECORD_DELETED;
}
void table_threads::make_row(PFS_thread *pfs)
{
pfs_lock lock;
PFS_thread_class *safe_class;
m_row_exists= false;
/* Protect this reader against thread termination */
pfs->m_lock.begin_optimistic_lock(&lock);
safe_class= sanitize_thread_class(pfs->m_class);
if (unlikely(safe_class == NULL))
return;
m_row.m_thread_internal_id= pfs->m_thread_internal_id;
m_row.m_thread_id= pfs->m_thread_id;
m_row.m_name= safe_class->m_name;
m_row.m_name_length= safe_class->m_name_length;
if (pfs->m_lock.end_optimistic_lock(&lock))
m_row_exists= true;
}
int table_threads::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: /* THREAD_ID */
set_field_ulong(f, m_row.m_thread_internal_id);
break;
case 1: /* PROCESSLIST_ID */
set_field_ulong(f, m_row.m_thread_id);
break;
case 2: /* NAME */
set_field_varchar_utf8(f, m_row.m_name, m_row.m_name_length);
break;
default:
DBUG_ASSERT(false);
}
}
}
return 0;
}
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