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Use LOCK_show_status when we add things to all_status_vars

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This was missing in my last commit for fixing possible lockups in SHOW STATUS.

sql/log.cc:
  Fixed comment
sql/sql_show.cc:
  Use LOCK_show_status when we add things to all_status_vars
sql/sql_test.cc:
  Remove not needed mutex_lock
This commit is contained in:
Michael Widenius 2014-09-15 17:11:01 +03:00
parent 50e67fe3bf
commit 7a50ce1d31
3 changed files with 5 additions and 7 deletions
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2
sql/log.cc
View File

@ -9640,7 +9640,7 @@ set_binlog_snapshot_file(const char *src)
Copy out current values of status variables, for SHOW STATUS or
information_schema.global_status.
This is called only under LOCK_status, so we can fill in a static array.
This is called only under LOCK_show_status, so we can fill in a static array.
*/
void
TC_LOG_BINLOG::set_status_variables(THD *thd)

8
sql/sql_show.cc
View File

@ -2846,7 +2846,7 @@ int add_status_vars(SHOW_VAR *list)
{
int res= 0;
if (status_vars_inited)
mysql_mutex_lock(&LOCK_status);
mysql_mutex_lock(&LOCK_show_status);
if (!all_status_vars.buffer && // array is not allocated yet - do it now
my_init_dynamic_array(&all_status_vars, sizeof(SHOW_VAR), 200, 20, MYF(0)))
{
@ -2861,7 +2861,7 @@ int add_status_vars(SHOW_VAR *list)
sort_dynamic(&all_status_vars, show_var_cmp);
err:
if (status_vars_inited)
mysql_mutex_unlock(&LOCK_status);
mysql_mutex_unlock(&LOCK_show_status);
return res;
}
@ -2923,7 +2923,7 @@ void remove_status_vars(SHOW_VAR *list)
{
if (status_vars_inited)
{
mysql_mutex_lock(&LOCK_status);
mysql_mutex_lock(&LOCK_show_status);
SHOW_VAR *all= dynamic_element(&all_status_vars, 0, SHOW_VAR *);
for (; list->name; list++)
@ -2944,7 +2944,7 @@ void remove_status_vars(SHOW_VAR *list)
}
}
shrink_var_array(&all_status_vars);
mysql_mutex_unlock(&LOCK_status);
mysql_mutex_unlock(&LOCK_show_status);
}
else
{

2
sql/sql_test.cc
View File

@ -575,7 +575,6 @@ void mysql_print_status()
/* Print key cache status */
puts("\nKey caches:");
process_key_caches(print_key_cache_status, 0);
mysql_mutex_lock(&LOCK_status);
printf("\nhandler status:\n\
read_key: %10lu\n\
read_next: %10lu\n\
@ -591,7 +590,6 @@ update: %10lu\n",
tmp.ha_write_count,
tmp.ha_delete_count,
tmp.ha_update_count);
mysql_mutex_unlock(&LOCK_status);
printf("\nTable status:\n\
Opened tables: %10lu\n\
Open tables: %10lu\n\