PDP-10 Archive: 4-documentation/mail.tco from BB-5255D-BM

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TOPS20 Change Order Number 4.2194

Written by: DBELL		20-Feb-79 15:55:33

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

Program: MAIL

Related TCO's:
Related SPR's: 	 12834


Problem: 
If a user tries to use MAIL from two different jobs at the same time,
the second MAIL dies with the message "?Invalid simultaneous access".

Diagnosis: 
The MAIL.CPY file is being written by both jobs, and only the first
job can win.

Solution: 
Make the user wait if the file is busy.  In the OPENF of the file,
set the OF%AWT bit to cause waiting until the file frees up.