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perfschema thread instrumentation related changes

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This commit is contained in:
Sergei Golubchik
2020-02-14 16:47:59 +01:00
parent 0d837e8153
commit 6ded554fc2
7 changed files with 76 additions and 36 deletions
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73
sql/sql_class.h
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@ -1021,6 +1021,39 @@ inline bool is_supported_parser_charset(CHARSET_INFO *cs)
return MY_TEST(cs->mbminlen == 1);
}
/** THD registry */
class THD_list_iterator
{
protected:
I_List<THD> threads;
mutable mysql_rwlock_t lock;
public:
/**
Iterates registered threads.
@param action called for every element
@param argument opque argument passed to action
@return
@retval 0 iteration completed successfully
@retval 1 iteration was interrupted (action returned 1)
*/
template <typename T> int iterate(my_bool (*action)(THD *thd, T *arg), T *arg= 0)
{
int res= 0;
mysql_rwlock_rdlock(&lock);
I_List_iterator<THD> it(threads);
while (auto tmp= it++)
if ((res= action(tmp, arg)))
break;
mysql_rwlock_unlock(&lock);
return res;
}
static THD_list_iterator *iterator();
};
#ifdef MYSQL_SERVER
void free_tmp_table(THD *thd, TABLE *entry);
@ -2375,9 +2408,22 @@ public:
*/
const char *proc_info;
void set_psi(PSI_thread *psi)
{
my_atomic_storeptr(&m_psi, psi);
}
PSI_thread* get_psi()
{
return static_cast<PSI_thread*>(my_atomic_loadptr(&m_psi));
}
private:
unsigned int m_current_stage_key;
/** Performance schema thread instrumentation for this session. */
PSI_thread *m_psi;
public:
void enter_stage(const PSI_stage_info *stage,
const char *calling_func,
@ -7262,11 +7308,8 @@ private:
/** THD registry */
class THD_list
class THD_list: public THD_list_iterator
{
I_List<THD> threads;
mutable mysql_rwlock_t lock;
public:
/**
Constructor replacement.
@ -7314,28 +7357,6 @@ public:
thd->unlink();
mysql_rwlock_unlock(&lock);
}
/**
Iterates registered threads.
@param action called for every element
@param argument opque argument passed to action
@return
@retval 0 iteration completed successfully
@retval 1 iteration was interrupted (action returned 1)
*/
template <typename T> int iterate(my_bool (*action)(THD *thd, T *arg), T *arg= 0)
{
int res= 0;
mysql_rwlock_rdlock(&lock);
I_List_iterator<THD> it(threads);
while (auto tmp= it++)
if ((res= action(tmp, arg)))
break;
mysql_rwlock_unlock(&lock);
return res;
}
};
extern THD_list server_threads;