Bug #28992: trigger fails in pushbuild

 - fixed wrong test case for bug 20903
 - closed the dangling connections in trigger.test
 - GET_LOCK() and RELEASE_LOCK() now produce more detailed log
 - fixed an omission in GET_LOCK() : assign the thread_id when
    acquiring the lock.


mysql-test/r/trigger.result:
  Bug #28992: test case updated
mysql-test/t/trigger.test:
  Bug #28992: test case updated. dangling connections closed.
sql/item_func.cc:
  Bug #28992: 
   - GET_LOCK() and RELEASE_LOCK() now produce more detailed log
   - fixed an omission in GET_LOCK() : assign the thread_id when
      acquiring the lock.

3 files changed, 53 insertions, 24 deletions

diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index fd9b15ab8ed..5405a632aa4 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -1454,19 +1454,22 @@ CREATE TABLE t2 (id INTEGER);
 INSERT INTO t2 VALUES (1),(2);
 CREATE TRIGGER t1_test AFTER INSERT ON t1 FOR EACH ROW 
 INSERT INTO t2 VALUES (new.id);
-SELECT GET_LOCK('B26162',20);
-GET_LOCK('B26162',20)
+SELECT GET_LOCK('B26162',120);
+GET_LOCK('B26162',120)
 1
-SELECT 'rl_acquirer', GET_LOCK('B26162',5), id FROM t2 WHERE id = 1;
+SELECT 'rl_acquirer', GET_LOCK('B26162',120), id FROM t2 WHERE id = 1;
 SET SESSION LOW_PRIORITY_UPDATES=1;
 SET GLOBAL LOW_PRIORITY_UPDATES=1;
 INSERT INTO t1 VALUES (5);
 SELECT 'rl_contender', id FROM t2 WHERE id > 1;
 SELECT RELEASE_LOCK('B26162');
 RELEASE_LOCK('B26162')
-0
-rl_acquirer	GET_LOCK('B26162',5)	id
-rl_acquirer	0	1
+1
+rl_acquirer	GET_LOCK('B26162',120)	id
+rl_acquirer	1	1
+SELECT RELEASE_LOCK('B26162');
+RELEASE_LOCK('B26162')
+1
 rl_contender	id
 rl_contender	2
 DROP TRIGGER t1_test;
diff --git a/mysql-test/t/trigger.test b/mysql-test/t/trigger.test
index 363df94eeb3..7158d02956e 100644
--- a/mysql-test/t/trigger.test
+++ b/mysql-test/t/trigger.test
@@ -1763,6 +1763,9 @@ select * from t1;
 select * from t3;
 drop table t1, t2, t3;
 
+disconnect addconroot1;
+disconnect addconroot2;
+disconnect addconwithoutdb;
 #
 # Bug #26162: Trigger DML ignores low_priority_updates setting
 #
@@ -1776,19 +1779,23 @@ INSERT INTO t2 VALUES (1),(2);
 CREATE TRIGGER t1_test AFTER INSERT ON t1 FOR EACH ROW 
   INSERT INTO t2 VALUES (new.id);
 
+CONNECT (rl_holder,    localhost, root,,);
 CONNECT (rl_acquirer,  localhost, root,,);
 CONNECT (wl_acquirer,  localhost, root,,);
 CONNECT (rl_contender, localhost, root,,);
 
-SELECT GET_LOCK('B26162',20);
+CONNECTION rl_holder;
+SELECT GET_LOCK('B26162',120);
 
 CONNECTION rl_acquirer;
 --send
-SELECT 'rl_acquirer', GET_LOCK('B26162',5), id FROM t2 WHERE id = 1;
+SELECT 'rl_acquirer', GET_LOCK('B26162',120), id FROM t2 WHERE id = 1;
 
 CONNECTION wl_acquirer;
 SET SESSION LOW_PRIORITY_UPDATES=1;
 SET GLOBAL LOW_PRIORITY_UPDATES=1;
+#need to wait for rl_acquirer to lock on the B26162 lock 
+sleep 2;
 --send
 INSERT INTO t1 VALUES (5);
 
@@ -1798,13 +1805,16 @@ CONNECTION rl_contender;
 --send
 SELECT 'rl_contender', id FROM t2 WHERE id > 1;
 
-CONNECTION default;
+CONNECTION rl_holder;
+#need to wait for wl_acquirer and rl_contender to lock on t2 
+sleep 2;
 SELECT RELEASE_LOCK('B26162');
 
-CONNECTION wl_acquirer;
---reap
 CONNECTION rl_acquirer;
 --reap
+SELECT RELEASE_LOCK('B26162');
+CONNECTION wl_acquirer;
+--reap
 CONNECTION rl_contender;
 --reap
 
@@ -1812,6 +1822,7 @@ CONNECTION default;
 DISCONNECT rl_acquirer;
 DISCONNECT wl_acquirer;
 DISCONNECT rl_contender;
+DISCONNECT rl_holder;
 
 DROP TRIGGER t1_test;
 DROP TABLE t1,t2;
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 580d19fbd4e..cc8830c6d6f 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -3449,6 +3449,7 @@ longlong Item_func_get_lock::val_int()
   THD *thd=current_thd;
   User_level_lock *ull;
   int error;
+  DBUG_ENTER("Item_func_get_lock::val_int");
 
   /*
     In slave thread no need to get locks, everything is serialized. Anyway
@@ -3458,7 +3459,7 @@ longlong Item_func_get_lock::val_int()
     it's not guaranteed to be same as on master.
   */
   if (thd->slave_thread)
-    return 1;
+    DBUG_RETURN(1);
 
   pthread_mutex_lock(&LOCK_user_locks);
 
@@ -3466,8 +3467,10 @@ longlong Item_func_get_lock::val_int()
   {
     pthread_mutex_unlock(&LOCK_user_locks);
     null_value=1;
-    return 0;
+    DBUG_RETURN(0);
   }
+  DBUG_PRINT("info", ("lock %.*s, thd=%ld", res->length(), res->ptr(),
+                      (long) thd->real_id));
   null_value=0;
 
   if (thd->ull)
@@ -3486,14 +3489,17 @@ longlong Item_func_get_lock::val_int()
       delete ull;
       pthread_mutex_unlock(&LOCK_user_locks);
       null_value=1;				// Probably out of memory
-      return 0;
+      DBUG_RETURN(0);
     }
     ull->thread=thd->real_id;
+    ull->thread_id=thd->thread_id;
     thd->ull=ull;
     pthread_mutex_unlock(&LOCK_user_locks);
-    return 1;					// Got new lock
+    DBUG_PRINT("info", ("made new lock"));
+    DBUG_RETURN(1);				// Got new lock
   }
   ull->count++;
+  DBUG_PRINT("info", ("ull->count=%d", ull->count));
 
   /*
     Structure is now initialized.  Try to get the lock.
@@ -3507,9 +3513,13 @@ longlong Item_func_get_lock::val_int()
   error= 0;
   while (ull->locked && !thd->killed)
   {
+    DBUG_PRINT("info", ("waiting on lock"));
     error= pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime);
     if (error == ETIMEDOUT || error == ETIME)
+    {
+      DBUG_PRINT("info", ("lock wait timeout"));
       break;
+    }
     error= 0;
   }
 
@@ -3533,6 +3543,7 @@ longlong Item_func_get_lock::val_int()
     ull->thread_id= thd->thread_id;
     thd->ull=ull;
     error=0;
+    DBUG_PRINT("info", ("got the lock"));
   }
   pthread_mutex_unlock(&LOCK_user_locks);
 
@@ -3542,7 +3553,7 @@ longlong Item_func_get_lock::val_int()
   thd->mysys_var->current_cond=  0;
   pthread_mutex_unlock(&thd->mysys_var->mutex);
 
-  return !error ? 1 : 0;
+  DBUG_RETURN(!error ? 1 : 0);
 }
 
 
@@ -3560,11 +3571,14 @@ longlong Item_func_release_lock::val_int()
   String *res=args[0]->val_str(&value);
   User_level_lock *ull;
   longlong result;
+  THD *thd=current_thd;
+  DBUG_ENTER("Item_func_release_lock::val_int");
   if (!res || !res->length())
   {
     null_value=1;
-    return 0;
+    DBUG_RETURN(0);
   }
+  DBUG_PRINT("info", ("lock %.*s", res->length(), res->ptr()));
   null_value=0;
 
   result=0;
@@ -3577,19 +3591,20 @@ longlong Item_func_release_lock::val_int()
   }
   else
   {
-#ifdef EMBEDDED_LIBRARY
-    if (ull->locked && pthread_equal(current_thd->real_id,ull->thread))
-#else
-    if (ull->locked && pthread_equal(pthread_self(),ull->thread))
-#endif
+    DBUG_PRINT("info", ("ull->locked=%d ull->thread=%ld thd=%ld", 
+                        (int) ull->locked,
+                        (long)ull->thread,
+                        (long)thd->real_id));
+    if (ull->locked && pthread_equal(thd->real_id,ull->thread))
     {
+      DBUG_PRINT("info", ("release lock"));
       result=1;					// Release is ok
       item_user_lock_release(ull);
-      current_thd->ull=0;
+      thd->ull=0;
     }
   }
   pthread_mutex_unlock(&LOCK_user_locks);
-  return result;
+  DBUG_RETURN(result);
 }