Problem : The basic problem is the way the thread sleeps in mysql-5.5 and also in mysql-5.1
          when we execute a stop slave on windows platform.
          On windows platform if the stop slave is executed after the master dies, we have 
          this long wait before the stop slave return a value. This is because there is a 
          sleep of the thread. The sleep is uninterruptable in the two above version,
          which was fixed by Davi patch for the BUG#11765860 for mysql-trunk. Backporting 
          his patch for mysql-5.5 fixes the problem. 

Solution : A new pair of mutex and condition variable is introduced to synchronize thread 
           sleep and finalization. A new mutex is required because the slave threads are 
           terminated while holding the slave thread locks (run_lock), which can not be 
           relinquished during termination as this would affect the lock order.