Fix mutex handling in SHOW_VARIABLES (key_buffer_size was not properly protected)

Changed some non fatal myisamchk error messages to warnings

1 files changed, 20 insertions, 2 deletions

diff --git a/sql/set_var.cc b/sql/set_var.cc
index b3238d1c0ec..6dc36e312cb 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -729,10 +729,12 @@ void fix_max_relay_log_size(THD *thd, enum_var_type type)
 bool sys_var_long_ptr::update(THD *thd, set_var *var)
 {
   ulonglong tmp= var->value->val_int();
+  pthread_mutex_lock(&LOCK_global_system_variables);
   if (option_limits)
     *value= (ulong) getopt_ull_limit_value(tmp, option_limits);
   else
     *value= (ulong) tmp;
+  pthread_mutex_unlock(&LOCK_global_system_variables);
   return 0;
 }
 
@@ -746,17 +748,21 @@ void sys_var_long_ptr::set_default(THD *thd, enum_var_type type)
 bool sys_var_ulonglong_ptr::update(THD *thd, set_var *var)
 {
   ulonglong tmp= var->value->val_int();
+  pthread_mutex_lock(&LOCK_global_system_variables);
   if (option_limits)
     *value= (ulonglong) getopt_ull_limit_value(tmp, option_limits);
   else
     *value= (ulonglong) tmp;
+  pthread_mutex_unlock(&LOCK_global_system_variables);
   return 0;
 }
 
 
 void sys_var_ulonglong_ptr::set_default(THD *thd, enum_var_type type)
 {
+  pthread_mutex_lock(&LOCK_global_system_variables);
   *value= (ulonglong) option_limits->def_value;
+  pthread_mutex_unlock(&LOCK_global_system_variables);
 }
 
 
@@ -1000,9 +1006,21 @@ Item *sys_var::item(THD *thd, enum_var_type var_type)
   case SHOW_LONG:
     return new Item_uint((int32) *(ulong*) value_ptr(thd, var_type));
   case SHOW_LONGLONG:
-    return new Item_int(*(longlong*) value_ptr(thd, var_type));
+  {
+    longlong value;
+    pthread_mutex_lock(&LOCK_global_system_variables);
+    value= *(longlong*) value_ptr(thd, var_type);
+    pthread_mutex_unlock(&LOCK_global_system_variables);
+    return new Item_int(value);
+  }
   case SHOW_HA_ROWS:
-    return new Item_int((longlong) *(ha_rows*) value_ptr(thd, var_type));
+  {
+    ha_rows value;
+    pthread_mutex_lock(&LOCK_global_system_variables);
+    value= *(ha_rows*) value_ptr(thd, var_type);
+    pthread_mutex_unlock(&LOCK_global_system_variables);
+    return new Item_int((longlong) value);
+  }
   case SHOW_MY_BOOL:
     return new Item_int((int32) *(my_bool*) value_ptr(thd, var_type),1);
   case SHOW_CHAR: