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8b670ee355
Replaced COND_refresh with COND_global_read_lock becasue of a bug in NTPL threads when using different mutexes as arguments to pthread_cond_wait() The original code caused a hang in FLUSH TABLES WITH READ LOCK in some circumstances because pthread_cond_broadcast() was not delivered to other threads. This fixes: Bug#16986: Deadlock condition with MyISAM tables Bug#20048: FLUSH TABLES WITH READ LOCK causes a deadlock mysql-test/r/flush.result: Added test case for deadlock with FLUSH TABLES WITH READ LOCK mysql-test/r/lock_multi.result: Test for bug in LOCK TABLE + optimize table mysql-test/t/flush.test: Added test case for deadlock with FLUSH TABLES WITH READ LOCK mysql-test/t/lock_multi.test: Test for bug in LOCK TABLE + optimize table sql/lock.cc: Replaced COND_refresh with COND_global_read_lock becasue of a bug in NTPL threads when using different mutexes as arguments to pthread_cond_wait() The original code caused a hang in FLUSH TABLES WITH READ LOCK in some circumstances because pthread_cond_broadcast() was not delivered to other threads sql/mysql_priv.h: Added COND_global_read_lock sql/mysqld.cc: Added COND_global_read_lock sql/sql_base.cc: More DBUG statements Added a broadcast in remove_table_from_cache() to release any threads waiting in open
62 lines
1.3 KiB
Plaintext
62 lines
1.3 KiB
Plaintext
drop table if exists t1,t2;
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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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update low_priority t1 set n = 4;
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select n from t1;
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unlock tables;
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n
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4
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drop table t1;
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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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update low_priority t1 set n = 4;
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select n from t1;
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unlock tables;
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n
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1
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drop table t1;
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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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update t1,t2 set c=a where b=d;
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select c from t2;
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c
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2
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drop table t1;
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drop table t2;
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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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insert t1 select * from t2;
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drop table t2;
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ERROR 42S02: Table 'test.t2' doesn't exist
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drop table t1;
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create table t1(a int);
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lock tables t1 write;
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show columns from t1;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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unlock tables;
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drop table t1;
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use mysql;
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LOCK TABLES columns_priv WRITE, db WRITE, host WRITE, user WRITE;
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FLUSH TABLES;
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use mysql;
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SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1;
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OPTIMIZE TABLES columns_priv, db, host, user;
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Table Op Msg_type Msg_text
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mysql.columns_priv optimize status OK
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mysql.db optimize status OK
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mysql.host optimize status OK
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mysql.user optimize status OK
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UNLOCK TABLES;
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Select_priv
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N
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use test;
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use test;
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