/* Begin include file mstb_format.incl.pl1 */

/* Modified 1984-07-23 BIM for V3: new hash function, checksums. */
/* Modified 1984-08-08 EJS to make comp_header an even number of
   words long.  This is required so that MSTB entries end up on
   an even word boundary. */

/* format: style3 */

/***** NOTE NOTE NOTE

       These tables have locks. Otherwise, checksum calculation
       would be an incredible complexity.

       It could, however be done. If the AS is split into multiple
       processes, the following can be done:

       1)    use stacq to maintain counters. 
       2)    use entry locks on the individual entries.
       3)    use the pclocks on the components 
             to validate checksum entries. 

       With any luck, we will have FAMIS files at our disposal
       by the time the AS splits, and all of this will be 
       unnecessary.

       --BIM 1984-07-23 */

declare	(hdrp, segp, ep)	pointer;

declare	1 mt_header	aligned based (hdrp),
	  2 header	aligned,			/* data mstb_mgr_ owns */
	    3 comp_hdr	aligned like comp_header,
	    3 lock	bit (36) aligned,		/* file lock */
	    3 pclock	fixed bin (35),		/* change count, used for passive locking */
	    3 mti		aligned like ms_table_info,
	    3 (number_components, entries_per_component, entry_offset)
			unsigned fixed binary (18),
	    3 (total_entries, deleted_entries, used_entries)
			fixed binary (35),
	    3 perm_data_checksum
			fixed bin (35),		/* sum of n_components, entries_per_component, entry_offset, total_entries, header_size, entry_size */
	    3 meters,				/* only maintained if mti.keep_meters is on */
	      4 searches	fixed binary (35),
	      4 entries_examined
			fixed binary (35),
	    3 pad		(12) bit (36) aligned,	/* 50 words to end of this */
	  2 header_data	(0 refer (mt_header.mti.header_size)) bit (36) aligned;

declare	1 comp_header	aligned based (segp),	/* 16 words */
	  2 type		character (32),
	  2 (dt_created, dt_updated)
			fixed binary (71),
	  2 component	unsigned fixed binary (18),
	  2 pad (3) bit (36); /* Pad out to 16 words. */

declare	1 entry		aligned based (ep),		/* 10 + entry size */
	  2 header	aligned,
	    3 flags	unaligned,
	      4 (used, deleted, inconsistent)
			bit (1),
	      4 pad	bit (15),
	    3 checksum	fixed bin (18) unsigned unaligned,
						/* checksums ENTIRE entry, including header */
	    3 lock	bit (36) aligned,		/* unused for now */
	    3 key		character (32) unaligned,
	  2 entry_data	(mt_header.mti.entry_size) bit (36) aligned;



/* End include file mstb_format.incl.pl1 */


*/
                                          -----------------------------------------------------------


Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group Bull including Bull HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell Bull Inc., Groupe Bull
and Bull HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for 
managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

                                          -----------------------------------------------------------

Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, Bull or Bull HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by Bull HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved

*/