global read lock code now uses a dedicated mutex

(otherwise a deadlock when ALTER writes to
binlog holding LOCK_open, it causes binlog rotation,
binlog waits for prepared transactions to commit, and commit
needs LOCK_open to check for global read lock)


mysql-test/r/flush.result:
  global read lock code now uses a dedicated mutex
mysql-test/t/flush.test:
  global read lock code now uses a dedicated mutex
sql/lock.cc:
  global read lock code now uses a dedicated mutex
sql/mysql_priv.h:
  global read lock code now uses a dedicated mutex
sql/mysqld.cc:
  global read lock code now uses a dedicated mutex
sql/sql_table.cc:
  global read lock code now uses a dedicated mutex

1 files changed, 1 insertions, 1 deletions

diff --git a/mysql-test/r/flush.result b/mysql-test/r/flush.result
index bab9b543307..306376b13c3 100644
--- a/mysql-test/r/flush.result
+++ b/mysql-test/r/flush.result
@@ -8,7 +8,7 @@ n
 3
 flush tables with read lock;
 drop table t2;
-ERROR HY000: Table 't2' was locked with a READ lock and can't be updated
+ERROR HY000: Can't execute the query because you have a conflicting read lock
  drop table t2;
 unlock tables;
 create database mysqltest;