bzr push into mysql-trunk branch (vasil.dimov:3870 to 3871) Bug#13513676

[vasil.dimov]

 3871 Vasil Dimov	2012-02-09
      Fix Bug#13513676 INNODB_BUFFER_POOL_DUMP_STATUS IS NOT POPULATED WITHIN EXPECTED TIME
      
      There is a tiny interval of time during startup when the status variable
      'innodb_buffer_pool_dump_status' can be '' before it becomes 'not started'.
      
      This patch makes the bug 100% reproducable:
      
      --- cut ---
        --- storage/innobase/buf/buf0dump.cc
        +++ storage/innobase/buf/buf0dump.cc
        @@ -577,12 +577,13 @@ DECLARE_THREAD(buf_dump_thread)(
         /*============================*/
         	void*	arg __attribute__((unused)))	/*!< in: a dummy parameter
         						required by os_thread_create */
         {
         	srv_buf_dump_thread_active = TRUE;
         
        +	sleep(5);
         	buf_dump_status(STATUS_INFO, "not started");
         	buf_load_status(STATUS_INFO, "not started");
      --- cut ---
      
      It is not easy to assign a default value to this variable which to be
      available before buf_dump_thread() starts, thus:
      
      The solution is to use include/wait_for_status_var.inc to wait for the
      variable to become 'not started'.

    modified:
      mysql-test/suite/sys_vars/t/innodb_buffer_pool_filename_basic.test
 3870 Guilhem Bichot	2012-02-09 [merge]
      merge from trunk

    modified:
      mysql-test/r/events_restart.result
      mysql-test/t/events_restart.test
      sql/events.cc
=== modified file 'mysql-test/suite/sys_vars/t/innodb_buffer_pool_filename_basic.test'
--- a/mysql-test/suite/sys_vars/t/innodb_buffer_pool_filename_basic.test	revid:guilhem.bichot@stripped
+++ b/mysql-test/suite/sys_vars/t/innodb_buffer_pool_filename_basic.test	revid:vasil.dimov@stripped
@@ -13,6 +13,9 @@ SELECT @orig;
 # 'Buffer pool(s) dump completed at ' left from previous runs because if
 # it is then the following wait condition may be satisfied without the
 # dump actually being complete and file_exists may fail.
+let $status_var = innodb_buffer_pool_dump_status;
+let $status_var_value = not started;
+-- source include/wait_for_status_var.inc
 SELECT variable_value
 FROM information_schema.global_status
 WHERE LOWER(variable_name) = 'innodb_buffer_pool_dump_status';

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