PROBLEM: (82154) (PATCH ID: OSF510-037)
********
This patch fixes hangs in threaded programs with subprocesses created 
with nfork(NULL).  Examining one of the hanging subprocesses shows that it 
has called fopen() and is waiting for the "iobptr" mutex in _findiop().
   The symptoms of the failure are:
    - the program does not terminate
    - the expected .td files (hex dumps of the input *.o files) are not 
      all created
    - some of the created subprocesses hang
    - the parent process sleeps waiting for the subprocesses to terminate

   Examining one of the hanging subprocesses shows that it has called fopen()
   and is apparently waiting for the "iobptr" mutex in _findiop().