InnoDB: implement LOCK TABLE (Bug #3299)

innobase/include/lock0lock.h:
  Add lock_table_unlock() and lock_release_tables_off_kernel()
  Add LOCK_TABLE_EXP
innobase/include/row0mysql.h:
  Add row_unlock_table_for_mysql() and row_lock_table_for_mysql()
innobase/include/trx0trx.h:
  Add n_tables_locked
innobase/lock/lock0lock.c:
  Add LOCK_TABLE_EXP for explicit LOCK TABLE commands
  Add lock_table_unlock()
  Add lock_release_tables_off_kernel()
innobase/row/row0mysql.c:
  Add row_unlock_table_for_mysql() and row_lock_table_for_mysql()
innobase/trx/trx0trx.c:
  Add n_tables_locked
mysql-test/r/innodb.result:
  Updated handling of auto_inc columns
sql/ha_innodb.cc:
  Call row_lock_table_for_mysql() and row_unlock_table_for_mysql()

1 files changed, 40 insertions, 0 deletions

diff --git a/mysql-test/t/innodb-lock.test b/mysql-test/t/innodb-lock.test
new file mode 100644
index 00000000000..43a175508b4
--- /dev/null
+++ b/mysql-test/t/innodb-lock.test
@@ -0,0 +1,40 @@
+-- source include/have_innodb.inc
+
+connect (con1,localhost,root,,);
+connect (con2,localhost,root,,);
+drop table if exists t1;
+
+#
+# Testing of explicit table locks
+#
+
+connection con1;
+create table t1 (id integer, x integer) engine=INNODB;
+insert into t1 values(0, 0);
+set autocommit=0;
+SELECT * from t1 where id = 0 FOR UPDATE;
+
+connection con2;
+set autocommit=0;
+
+# The following statement should hang because con1 is locking the page
+--send
+lock table t1 write;
+--sleep 2;
+
+connection con1;
+update t1 set x=1 where id = 0;
+select * from t1;
+commit;
+
+connection con2;
+reap;
+update t1 set x=2 where id = 0;
+commit;
+unlock tables;
+
+connection con1;
+select * from t1;
+commit;
+
+drop table t1;