why do two mysql lock and flush statements on different dbs hang -

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We have two identical DBS A and B.

First I connect to DB A with the client

mysql -ua -pa a

I issue commands 

  write lock table table 1, write table 2; Flush table table 1, table 2;   
 I open a new session without closing the session  
 mysql -ub -pb b  
 I issue the same order    write table table 1, write table 2; Flush table table 1, table 2;   
 The second flush seems to be trapped. Only when I close the first connection, the second flush is the success.  
 Why does this happen, are these two different DBS? How can I avoid this?  
 I use mysql 5.1 and all tables are myisam tables.

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