In http://bazaar.launchpad.net/~maria-captains/maria/10.0-mdev452/revision/3434 you
make some change to the class TC_LOG_MMAP,and I want to debug those
codes to see how it works.but i don't understand in what conditions will
MySQL use the TC_LOG_MMAP.it only use TC_LOG_DUMMY or MYSQL_BIN_LOG depends
on the value of opt_bin_log.so how will it use the TC_LOG_MMAP in
MySQL.