from mysql-trunk-innodb. The same problem also exists in 5.5.

  X revision-id: vasil.dimov@oracle.com-20101201140708-fsc5xlu9bkpov6pv
  X committer: Vasil Dimov <vasil.dimov@oracle.com>
  X branch nick: mysql-trunk-innodb
  X timestamp: Wed 2010-12-01 16:07:08 +0200
  X message:
  X   Fix Bug#58432 innodb.innodb_bug56143 fails under valgrind
  X   
  X   Use a longer timeout for semaphore waits if (possibly) running under
  X   Valgrind.
  X   
  X   Approved by:	Marko (via IRC)