bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.

Redesigned the handler close functions so that they are usable
at different places where waiting for closing tables is done.


mysql-test/r/flush_table.result:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Added the test results.
mysql-test/t/flush_table.test:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Activated old test case.
  Added new test cases.
sql/mysql_priv.h:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Made mysql_ha_close() more flexible.
  Removed mysql_ha_closeall(), which closed only one table despite its name.
  Added mysql_ha_close_list(), which closes the complete list or all tables and does not lock.
  Removed a duplicate declaration.
sql/sql_base.cc:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Added proper close calls before some wait points to avoid deadlocks
  or infinite loops.
sql/sql_handler.cc:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Redesigned the internal function find_table_ptr_by_name().
  It can now suppress locking and tells if the requested table
  has been flushed by itself.
  Extended mysql_ha_close() so that it can now suppres locking
  and error reporting. That way it can be used at more places and the
  old function mysql_ha_closeall() is now obsolete.
  Added a new function mysql_ha_close_list() which closes a whole list
  of HANDLER tables or all HANDLER tables, if the list is NULL.
  Furthermore is can close all 'old' (marked for flush) HANDLER tables.
sql/sql_table.cc:
  bug#3565 - HANDLER and FLUSH TABLE/TABLES deadlock.
  Replaced the obsolte mysql_ha_closeall() by the new mysql_ha_close().

mysql-test/r/flush_table.result

@@ -0,0 +1,120 @@
+drop table if exists t1;
+create table t1 (a int not null auto_increment primary key);
+insert into t1 values(0);
+lock table t1 read;
+flush table t1;
+check table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+drop table t1;
+drop database if exists test_test;
+create database test_test;
+use test_test;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test_test.t1');
+insert into t1 values ('');
+handler t1 open;
+handler t1 read first limit 9;
+table_id
+test_test.t1
+
+create table t2(table_id char(20) primary key);
+insert into t2 values ('test_test.t2');
+insert into t2 values ('');
+handler t2 open;
+handler t2 read first limit 9;
+table_id
+test_test.t2
+
+use test;
+drop table if exists t1;
+create table t1(table_id char(20) primary key);
+insert into t1 values ('test.t1');
+insert into t1 values ('');
+handler t1 open;
+handler t1 read first limit 9;
+table_id
+test.t1
+
+use test;
+handler test.t1 read first limit 9;
+table_id
+test.t1
+
+handler test.t2 read first limit 9;
+Unknown table 't2' in HANDLER
+handler test_test.t1 read first limit 9;
+table_id
+test_test.t1
+
+handler test_test.t2 read first limit 9;
+table_id
+test_test.t2
+
+handler test_test.t1 close;
+drop table test_test.t1;
+handler test_test.t2 close;
+drop table test_test.t2;
+drop database test_test;
+use test;
+handler test.t1 close;
+drop table test.t1;
+drop table if exists t1;
+drop table if exists t2;
+create table t1(table_id char(20) primary key);
+create table t2(table_id char(20) primary key);
+insert into t1 values ('test.t1');
+insert into t1 values ('');
+insert into t2 values ('test.t2');
+insert into t2 values ('');
+handler t1 open as a1;
+handler t1 open as a2;
+handler t2 open;
+handler a1 read first limit 9;
+table_id
+test.t1
+
+handler a2 read first limit 9;
+table_id
+test.t1
+
+handler t2 read first limit 9;
+table_id
+test.t2
+
+flush tables;
+handler a1 read first limit 9;
+Unknown table 'a1' in HANDLER
+handler a2 read first limit 9;
+Unknown table 'a2' in HANDLER
+handler t2 read first limit 9;
+Unknown table 't2' in HANDLER
+handler t1 open as a1;
+handler t1 open as a2;
+handler t2 open;
+handler a1 read first limit 9;
+table_id
+test.t1
+
+handler a2 read first limit 9;
+table_id
+test.t1
+
+handler t2 read first limit 9;
+table_id
+test.t2
+
+flush table t1;
+handler a1 read first limit 9;
+Unknown table 'a1' in HANDLER
+handler a2 read first limit 9;
+Unknown table 'a2' in HANDLER
+handler t2 read first limit 9;
+table_id
+test.t2
+
+flush table t2;
+handler t2 close;
+Unknown table 't2' in HANDLER
+drop table t1;
+drop table t2;