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TOPS20 Change Order Number 4.2569

Written by: DBELL		 9-Nov-79 10:37:37

Edit checked: NO			   Document: NO
  TCO Tested: NO		Maintenance Release: NO
Hardware-related: NO

Program: mapper

Related TCO's:
Related SPR's: 

Jobs can get unexplained "JFN not assigned" errors from various
programs if MAPPER is run in the job.

Like many other programs that do this wrong, MAPPER does the following
sequence of JSYSes:  GTJFN, CFORK, GET, KFORK, and RJLFN.  Since the
GET JSYS releases the JFN (or hands it to the inferior fork), the final
RLJFN releases a JFN which is no longer valid, thus possibly destroying
a JFN that some other program had just obtained.

Don't do a RLJFN after the GET succeeds.