1 files changed, 49 insertions, 0 deletions
diff --git a/mysql-test/t/lock_multi.test b/mysql-test/t/lock_multi.test
new file mode 100644
index 00000000000..53e9fd3393c
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+++ b/mysql-test/t/lock_multi.test
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+# This test doesn't work with the embedded version as this code
+# assumes that one query is running while we are doing queries on
+# a second connection.
+# This would work if mysqltest run would be threaded and handle each
+# connection in a separate thread.
+#
+-- source include/not_embedded.inc
+
+#test to see if select will get the lock ahead of low priority update
+
+connect (locker,localhost,root,,);
+connect (reader,localhost,root,,);
+connect (writer,localhost,root,,);
+
+connection locker;
+create table t1(n int);
+insert into t1 values (1);
+lock tables t1 write;
+connection writer;
+send update low_priority t1 set n = 4;
+connection reader;
+--sleep 2
+send select n from t1;
+connection locker;
+--sleep 2
+unlock tables;
+connection writer;
+reap;
+connection reader;
+reap;
+drop table t1;
+
+connection locker;
+create table t1(n int);
+insert into t1 values (1);
+lock tables t1 read;
+connection writer;
+send update low_priority t1 set n = 4;
+connection reader;
+--sleep 2
+send select n from t1;
+connection locker;
+--sleep 2
+unlock tables;
+connection writer;
+reap;
+connection reader;
+reap;
+drop table t1;