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Fix for bug #12423 "Deadlock when doing FLUSH PRIVILEGES and GRANT in

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multi-threaded environment".

To avoid deadlocks between several simultaneously run account management 
commands (particularly between FLUSH PRIVILEGES/SET PASSWORD and GRANT
commands) we should always take table and internal locks during their
execution in the same order. In other words we should first open and lock
privilege tables and only then obtain acl_cache::lock/LOCK_grant locks.
This commit is contained in:
dlenev@mysql.com
2005-09-01 16:52:59 +04:00
parent d9e3ad09e5
commit da2af0bb6d
6 changed files with 320 additions and 171 deletions
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8
sql/sql_acl.h
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@@ -134,8 +134,8 @@ public:
/* prototypes */
bool hostname_requires_resolving(const char *hostname);
my_bool acl_init(THD *thd, bool dont_read_acl_tables);
void acl_reload(THD *thd);
my_bool acl_init(bool dont_read_acl_tables);
my_bool acl_reload(THD *thd);
void acl_free(bool end=0);
ulong acl_get(const char *host, const char *ip,
const char *user, const char *db, my_bool db_is_pattern);
@@ -151,9 +151,9 @@ int mysql_grant(THD *thd, const char *db, List <LEX_USER> &user_list,
int mysql_table_grant(THD *thd, TABLE_LIST *table, List <LEX_USER> &user_list,
List <LEX_COLUMN> &column_list, ulong rights,
bool revoke);
my_bool grant_init(THD *thd);
my_bool grant_init();
void grant_free(void);
void grant_reload(THD *thd);
my_bool grant_reload(THD *thd);
bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
uint show_command, uint number, bool dont_print_error);
bool check_grant_column (THD *thd,TABLE *table, const char *name, uint length,