plugin/semisync/CMakeLists.txt:
  Add CMakeLists.txt for semisync

CMakeLists.txt:
  Add plugin/semisync subdirectory
mysql-test/mysql-test-run.pl:
  Check for semisync dll for Windows
mysql-test/suite/rpl/r/rpl_semi_sync.result:
  Update result file
mysql-test/suite/rpl/t/rpl_semi_sync.test:
  Test semi-sync on Windows
plugin/semisync/semisync_master.cc:
  Define gettimeofday for Windows

Postfix

      
      Before the patch, slaves only appear in the output of SHOW SLAVE HOSTS 
      when report-host option is set. If an expected slave does not appear in  
      the list, nobody knows whether the slave does not connect or has started
      without the "report-host" option. The output also contains a strange  
      field "Rpl_recovery_rank" which has never been implemented and the manual 
      of MySQL5.4 declares that the field has been removed from MySQL5.4.
                                        
      This patch is done with these,
      According to the manual of MySQL5.4, "Rpl_recovery_rank" is removed.
      Slaves will register themselves to master no matter if report_host option is set
      or not. When slaves are registering themselves, their Server_ids, report_host
      and other information are together sent to master. Sever_ids are never null 
      and is unique in one replication group. Slaves always can be identified with  
      different Server_ids no matter if report_host exists.

Knowledge of no SSL support is not used
Skip tests the same way e.g. innodb tests are
Does not refer to have_ssl_communication.inc, 
     will add this when merging to 6.0-codebase

rpl_semi_sync_master_wait_sessions was reset by FLUSH STATUS,
which could cause the master fail to wake up waiting sessions and
result in master timeout waiting for slave reply.

rpl_semi_sync_master_wait_session should not be reset, this 
problem is fixed by this patch.


plugin/semisync/semisync_master_plugin.cc:
  Change wait_sessions from SHOW_LONG back to SHOW_FUNC so that it will not be reset by FLUSH STATUS.

Don't print entire log, but use extract_server_log() introduced by 46007

Test batches may be terminated too early
Avoid counting exp-fail tests

Use "#ifdef", not plain "#if".

Temporary tables may set join->group to 0 even though there is 
grouping. Also need to test if sum_func_count>0 when JOIN::exec() 
decides whether to present results in a grouped manner.

sql/sql_select.cc:
  Temporary tables may set join->group to 0 even though there is 
  grouping. Also need to test if sum_func_count>0 when JOIN::exec() 
  decides whether to present results in a grouped manner.