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1d6addd9bb
Use open_normal_and_derived_tables instead of open_and_lock_tables when reading metadata for a table.
Add two test cases, one for "USE database" and one for "SHOW COLUMNS FROM table"
mysql-test/r/lock_multi.result:
Updated test results for test case for bug9998
mysql-test/r/mysql.result:
Updated results for test case for bug9998
mysql-test/t/lock_multi.test:
Test that "show columsn from t1" is not locked by another thread having a write lock on t1
mysql-test/t/mysql.test:
Add test case for BUG9998
- lock table t1 for write from mysql-test, then execute 'mysql' and call "USE test". This will test exactly what caused the bug.
sql/sql_show.cc:
Open tables without locking when reading metadata
108 lines
2.2 KiB
Text
108 lines
2.2 KiB
Text
# This test doesn't work with the embedded version as this code
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# assumes that one query is running while we are doing queries on
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# a second connection.
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# This would work if mysqltest run would be threaded and handle each
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# connection in a separate thread.
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#
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-- source include/not_embedded.inc
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--disable_warnings
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drop table if exists t1,t2;
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--enable_warnings
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# Test to see if select will get the lock ahead of low priority update
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connect (locker,localhost,root,,);
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connect (reader,localhost,root,,);
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connect (writer,localhost,root,,);
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connection locker;
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create table t1(n int);
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insert into t1 values (1);
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lock tables t1 write;
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connection writer;
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send update low_priority t1 set n = 4;
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connection reader;
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--sleep 2
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send select n from t1;
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connection locker;
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--sleep 2
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unlock tables;
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connection writer;
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reap;
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connection reader;
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reap;
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drop table t1;
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connection locker;
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create table t1(n int);
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insert into t1 values (1);
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lock tables t1 read;
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connection writer;
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send update low_priority t1 set n = 4;
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connection reader;
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--sleep 2
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send select n from t1;
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connection locker;
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--sleep 2
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unlock tables;
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connection writer;
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reap;
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connection reader;
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reap;
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drop table t1;
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#
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# Test problem when using locks with multi-updates
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# It should not block when multi-update is reading on a read-locked table
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#
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connection locker;
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create table t1 (a int, b int);
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create table t2 (c int, d int);
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insert into t1 values(1,1);
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insert into t1 values(2,2);
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insert into t2 values(1,2);
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lock table t1 read;
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connection writer;
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--sleep 2
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send update t1,t2 set c=a where b=d;
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connection reader;
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--sleep 2
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select c from t2;
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connection writer;
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reap;
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connection locker;
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drop table t1;
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drop table t2;
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#
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# Test problem when using locks on many tables and droping a table that
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# is to-be-locked by another thread
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#
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connection locker;
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create table t1 (a int);
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create table t2 (a int);
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lock table t1 write, t2 write;
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connection reader;
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send insert t1 select * from t2;
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connection locker;
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drop table t2;
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connection reader;
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--error 1146
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reap;
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connection locker;
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drop table t1;
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#
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# BUG#9998 - MySQL client hangs on USE "database"
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create table t1(a int);
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lock tables t1 write;
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connection reader;
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show columns from t1;
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connection locker;
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unlock tables;
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drop table t1;
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