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Trailing-Edge - PDP-10 Archives - BB-M081Z-SM - monitor-sources/enq.mac
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; Edit= 8965 to ENQ.MAC on 12-Sep-88 by BROOKS, for SPR #21912
;Add ENQ-DEQ capability to ENQC% .ENQCD function
; Edit= 8846 to ENQ.MAC on 24-May-88 by LOMARTIRE (TCO 7.1286)
;Prevent jobs hung in ENQTST and missing notification 
;  Don't let QSKDRC base a reply on a Q-Block which is not locked.
;  In QDEQ, call LOKSKD before QDLBFS so that notification is sent.
; UPD ID= 8685, RIP:<7.MONITOR>ENQ.MAC.11,  17-Mar-88 19:22:28 by RASPUZZI
;TCO 7.1258 - Take another whack at fixing FSPOUT problems. FSPREM now
;	      returns the biggest block in the pool when called.
; UPD ID= 8511, RIP:<7.MONITOR>ENQ.MAC.10,   9-Feb-88 15:20:17 by GSCOTT
;TCO 7.1218 - Update copyright date.
; UPD ID= 8346, RIP:<7.MONITOR>ENQ.MAC.9,  15-Jan-88 15:44:46 by LOMARTIRE
;TCO 7.1180 - Remove ENQSPC and ENQMXF - use FSPREM instead.
; UPD ID= 8340, RIP:<7.MONITOR>ENQ.MAC.8,  14-Jan-88 16:04:04 by LOMARTIRE
;TCO 7.1179 - Make EN.CLL present in the Lock-Block to represent a 
;  cluster-wide lock whenever there is at least one Q-Block with EN.CLL set.
; UPD ID= 8334, RIP:<7.MONITOR>ENQ.MAC.7,   6-Jan-88 13:59:38 by LOMARTIRE
;TCO 7.1172 - Prevent ILLUUO and ILFPTE BUGHLTs on CI-less systems
; UPD ID= 261, RIP:<7.MONITOR>ENQ.MAC.6,   5-Nov-87 15:42:39 by LOMARTIRE
;TCO 7.1115 - Add counter EQLBCT; the number of blocks on EQLBLT
; UPD ID= 219, RIP:<7.MONITOR>ENQ.MAC.5,  27-Oct-87 16:00:27 by LOMARTIRE
;TCO 7.1088 - Prevent corrupted hash chain and free space crashes by 
;correctly managing EQLBLT in LOKREL.  Also, fix a bug in ENQCD which 
;prevents the dumping of several blocks chained off of the same hash 
;table index.
; UPD ID= 159, RIP:<7.MONITOR>ENQ.MAC.4,  19-Oct-87 17:09:30 by LOMARTIRE
;TCO 7.1072 - Add support for cluster-wide ENQ
; UPD ID= 81, RIP:<7.MONITOR>ENQ.MAC.3,  19-Aug-87 13:00:33 by LOMARTIRE
;TCO 7.1041 - Fix ENQC% functions 1 and 2 to use the correct job number
;TCO 7.1040 - Move most of code into XCDSEC.  The only code remaining in 
; MSEC1 is: .ENQ, .DEQ, .ENQC, ENQCD, ENQTST, ENQFKR, ENQCLS, and ENQINI.
; *** Edit 7348 to ENQ.MAC by LOMARTIRE on 1-Aug-86
; Prevent OPNX9 errors from stale ENQ tokens remaining on system 
; UPD ID= 2070, SNARK:<6.1.MONITOR>ENQ.MAC.26,   3-Jun-85 14:33:41 by MCCOLLUM
;TCO 6.1.1406  - Update copyright notice.
; UPD ID= 4932, SNARK:<6.MONITOR>ENQ.MAC.25,  15-Oct-84 13:02:17 by GRANT
;The assembly switch CFSCOD has been eliminated
; UPD ID= 4794, SNARK:<6.MONITOR>ENQ.MAC.24,   7-Sep-84 00:02:36 by TGRADY
;Fix ENQC% Function 1/2 check of user specified job number
; UPD ID= 4793, SNARK:<6.MONITOR>ENQ.MAC.23,   6-Sep-84 23:03:55 by TGRADY
;TCO 6.1996 - Remove this tco...proper fix was in previous edit.
; UPD ID= 4780, SNARK:<6.MONITOR>ENQ.MAC.22,  30-Aug-84 14:49:51 by TGRADY
;More of TCO 6.2174, convert local job index returned by ENQDM2 to a global
; UPD ID= 4768, SNARK:<6.MONITOR>ENQ.MAC.21,  29-Aug-84 13:55:38 by TGRADY
;TCO 6.2174 (QAR 706200) Fix ENQDMP to properly identify job-wide resources.
; UPD ID= 4740, SNARK:<6.MONITOR>ENQ.MAC.20,  24-Aug-84 09:42:07 by PAETZOLD
;TCO 6.2191 - Change unsafe SETJSB calls to MAPJSB.
; UPD ID= 4516, SNARK:<6.MONITOR>ENQ.MAC.19,  13-Jul-84 19:35:02 by PURRETTA
;Update copyright notice
; UPD ID= 4183, SNARK:<6.MONITOR>ENQ.MAC.18,   8-May-84 14:19:55 by GRANT
;In CFETST, error code should be OPNX9.  Previous edit had changed it.
; UPD ID= 4167, SNARK:<6.MONITOR>ENQ.MAC.17,   1-May-84 14:55:07 by GRANT
;Call CFS whenever user tries to ENQ% a long term lock, in particular, when
;the lock block already exists.
; UPD ID= 3922, SNARK:<6.MONITOR>ENQ.MAC.16,  14-Mar-84 10:50:27 by TGRADY
;TCO 6.1996 -  Fix missed job index being handed to user.
; - In ENQDMP, Translate Local Job index to Global Job Number before
;   returning it to the user.
;
; UPD ID= 3796, SNARK:<6.MONITOR>ENQ.MAC.15,  29-Feb-84 01:41:51 by TGRADY
; Implement Global Job Numbers
; - In ENQOK, translate user-specified Global Job Number to local index
; - In VALRQ1, use GBLJNO, instead of JOBNO.
; - In ENCF0H, Translate Local Job index to Global Job Number before
;   returning it to the user.
;
; UPD ID= 3662, SNARK:<6.MONITOR>ENQ.MAC.14,   7-Feb-84 16:36:21 by VATNE
; UPD ID= 3662, SNARK:<6.MONITOR>ENQ.MAC.14,   7-Feb-84 16:36:21 by VATNE
; UPD ID= 3294, SNARK:<6.MONITOR>ENQ.MAC.12,  12-Dec-83 15:00:46 by CJOHNSON
;TCO 6.1899 - Make ENQC% return job # owning lock and EN%QCB
; UPD ID= 2860, SNARK:<6.MONITOR>ENQ.MAC.11,  23-Aug-83 15:06:47 by LOMARTIRE
;TCO 6.1692 - Change macro name from LCKINI to INILCK so routine is usable
; UPD ID= 2793, SNARK:<6.MONITOR>ENQ.MAC.10,   4-Aug-83 00:29:10 by LEACHE
;TCO 6.1641 Move swappable freespace out of section zero
; UPD ID= 2596, SNARK:<6.MONITOR>ENQ.MAC.9,  20-Jun-83 10:40:23 by HALL
;TCO 6.1689 - Move fork tables to extended section
;	Reference FKJOB via DEFSTR
; UPD ID= 1688, SNARK:<6.MONITOR>ENQ.MAC.8,  20-Jan-83 09:53:41 by MILLER
; UPD ID= 1687, SNARK:<6.MONITOR>ENQ.MAC.7,  20-Jan-83 09:39:26 by MILLER
;TCO 6.1474. Implement CFS ENQ/DEQ detector.
; UPD ID= 204, SNARK:<5.MONITOR>ENQ.MAC.6,  22-Sep-81 16:57:52 by PAETZOLD
;More TCO 5.1481 - Fix the problem
; UPD ID= 165, SNARK:<5.MONITOR>ENQ.MAC.5,  10-Sep-81 14:45:03 by PAETZOLD
;TCO 5.1481 - Check for illegal OWGBP's
; UPD ID= 1763, SNARK:<5.MONITOR>ENQ.MAC.4,  24-Mar-81 14:07:53 by BLOUNT
;change STRCMP+5 from CAIN T2,NUMVAL to CAIN T3,NUMVAL
; UPD ID= 1003, SNARK:<5.MONITOR>ENQ.MAC.3,  11-Sep-80 18:00:47 by GRANT
;Change MONX01 to MONX06 in ASGEQ routine
; UPD ID= 935, SNARK:<5.MONITOR>ENQ.MAC.2,  20-Aug-80 15:15:43 by ENGEL
;TCO #5.1136 - CHANGE ALL LOCKS TO CONFORM TO THE NEW LOCK SCHEME
; UPD ID= 46, SNARK:<4.1.MONITOR>ENQ.MAC.16,  28-Nov-79 17:25:57 by HALL
;REMOVE CODE FOR INTERNAL ENQ AND DEQ OPERATIONS BECAUSE NO ONE CALLS IT
;<4.MONITOR>ENQ.MAC.14, 21-Oct-79 18:43:46, EDIT BY MAGRATH
;TCO 4.2540 - Routine FNDQ, add JFN check to search criteria
;<OSMAN.MON>ENQ.MAC.1, 10-Sep-79 15:28:06, EDIT BY OSMAN
;TCO 4.2412 - Move definition of BUGHLTs, BUGCHKs, and BUGINFs to BUGS.MAC
;<4.MONITOR>ENQ.MAC.12, 29-Aug-79 20:06:49, EDIT BY ZIMA
;USE THE PREFERRED MNEMONICS TO CHECK FOR NUMVAL
;<4.MONITOR>ENQ.MAC.11, 10-Jul-79 12:56:44, EDIT BY ZIMA
;TCO 4.2321 - FIX STRCMP TO RECOGNIZE MISMATCH OF USER CODE AND STRING.
;<4.MONITOR>ENQ.MAC.10,  1-May-79 23:31:04, Edit by MCLEAN
;MAKE JOB NUMBER OF 0,,-1 BE -1 FOR GTOKM .GOENQ..
;<4.MONITOR>ENQ.MAC.9, 18-Apr-79 16:46:41, Edit by MCLEAN
;REMOVE EXTRANEOUS NOINT ON CALL TO SETJSB IN ENQOK
;<4.MONITOR>ENQ.MAC.8, 18-Apr-79 15:10:00, Edit by MCLEAN
;ADD JOB NUMBER TO ENQ QUOTA CHANGE
;<4.MONITOR>ENQ.MAC.7,  5-Apr-79 11:44:12, Edit by MCLEAN
;<4.MONITOR>ENQ.MAC.6,  5-Apr-79 11:25:10, Edit by MCLEAN
;REMOVE 1ST ARG FROM GTOKM
;<4.MONITOR>ENQ.MAC.5,  9-Mar-79 14:05:32, Edit by MCLEAN
;FIX GTOKM TO RETERR NOT ITRAP
;<4.MONITOR>ENQ.MAC.4,  4-Mar-79 15:34:01, EDIT BY KONEN
;UPDATE COPYRIGHT FOR RELEASE 4
;<4.MONITOR>ENQ.MAC.3, 23-Jul-78 16:54:03, Edit by MCLEAN
;ADD GETOK TO SETTING QUOTAS FOR ENQ FOR NON PRIV USERS
;<4.MONITOR>ENQ.MAC.2, 23-Jul-78 16:52:40, Edit by MCLEAN

;	COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1976, 1988.
;	ALL RIGHTS RESERVED.
;
;	THIS SOFTWARE IS FURNISHED UNDER A  LICENSE AND MAY BE USED AND  COPIED
;	ONLY IN  ACCORDANCE  WITH  THE  TERMS OF  SUCH  LICENSE  AND  WITH  THE
;	INCLUSION OF THE ABOVE  COPYRIGHT NOTICE.  THIS  SOFTWARE OR ANY  OTHER
;	COPIES THEREOF MAY NOT BE PROVIDED  OR OTHERWISE MADE AVAILABLE TO  ANY
;	OTHER PERSON.  NO  TITLE TO  AND OWNERSHIP  OF THE  SOFTWARE IS  HEREBY
;	TRANSFERRED.
;
;	THE INFORMATION IN THIS  SOFTWARE IS SUBJECT  TO CHANGE WITHOUT  NOTICE
;	AND SHOULD  NOT  BE CONSTRUED  AS  A COMMITMENT  BY  DIGITAL  EQUIPMENT
;	CORPORATION.
;
;	DIGITAL ASSUMES NO  RESPONSIBILITY FOR  THE USE OR  RELIABILITY OF  ITS
;	SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
	SEARCH ENQPAR,PROLOG		;[7.1072]
	SALL				;[7.1072]
	TTITLE (ENQ,,< - ENQ%, DEQ% and ENQC%>)

	EXTN <CFSENQ,CFSDEQ>
	EXTERN ASGENQ,RELENQ,ENQQOT

;[7.1072] Local storage declared in STG.MAC

EXTN <HSHTBL,HSHLEN,ENFKTB,ENFKTL>	;[7.1072]
	Subttl	Table of Contents

;		     Table of Contents for ENQ
;
;				  Section		      Page
;
;
;    1. The ENQ% JSYS  . . . . . . . . . . . . . . . . . . . .   7
;        1.1    ENQREQ (Worker routine for .ENQ) . . . . . . .  12
;        1.2    ENQFN3 (The .ENQMA function of ENQ%) . . . . .  17
;        1.3    CFETST (CFS resource check on OFNs)  . . . . .  18
;    2. The DEQ% JSYS  . . . . . . . . . . . . . . . . . . . .  19
;        2.1    DEQREQ (Worker routine for .DEQ) . . . . . . .  20
;        2.2    DEQFN0 (Function 0)  . . . . . . . . . . . . .  21
;        2.3    DEQMSK (Check for fully DEQed request) . . . .  23
;        2.4    DEQFN1 (Function 1)  . . . . . . . . . . . . .  24
;        2.5    DEQFN2 (Function 2)  . . . . . . . . . . . . .  25
;    3. The ENQC% JSYS . . . . . . . . . . . . . . . . . . . .  26
;        3.1    ENQCF0 (Function 0)  . . . . . . . . . . . . .  27
;        3.2    ENQC1 (Functions 1 and 2)  . . . . . . . . . .  31
;        3.3    ENQCD (Function 3) . . . . . . . . . . . . . .  32
;            3.3.1    ENQDMP (Dump database) . . . . . . . . .  33
;    4. VALARG (Validate user argument block)  . . . . . . . .  35
;    5. VALREQ (Validate a lock request) . . . . . . . . . . .  36
;    6. CHKENP (Check for ENQ privs) . . . . . . . . . . . . .  38
;    7. CHKWHL (Check for WHEEL/OPERATOR privs)  . . . . . . .  39
;    8. CHKJFN (Check for legal JFN) . . . . . . . . . . . . .  40
;    9. FNDLOK (Find a Lock-Block) . . . . . . . . . . . . . .  41
;   10. FNDQ (Find a Q-Block)  . . . . . . . . . . . . . . . .  42
;   11. GETLVL (Get highest locked level)  . . . . . . . . . .  43
;   12. CNTQ/CNTQLQ (Get share counts) . . . . . . . . . . . .  44
;   13. STRCMP/STVCMP (Compare strings or user codes)  . . . .  45
;   14. CRELOK (Create a Lock-Block) . . . . . . . . . . . . .  46
;   15. CREQ (Create a Q-Block and link to Lock-Block) . . . .  48
;   16. REQDEQ (DEQ an entire request) . . . . . . . . . . . .  50
;   17. SQDEQ (DEQ a single Q-Block) . . . . . . . . . . . . .  51
;   18. QDEQ (DEQ a Q-Block) . . . . . . . . . . . . . . . . .  52
;   19. QDLBFS (Set LB Flags after QB Release) . . . . . . . .  54
;   20. LOKREL (Release a Lock-Block)  . . . . . . . . . . . .  55
;   21. QSKD/QSKDRC (Perform a scheduling pass on Q-Block) . .  57
;   22. SETINV (Set Q-Block invisible) . . . . . . . . . . . .  61
;   23. LOKSKD/REESKD (Perform a scheduling pass on Lock-Block  62
;   24. INTQ (Wake up a waiting fork when lock is locked)  . .  64
;   25. ENQTST (Scheduler test)  . . . . . . . . . . . . . . .  65
;   26. ASGEQ (Get space for an ENQ block) . . . . . . . . . .  66
;   27. RELEQ (Release ENQ block space)  . . . . . . . . . . .  67
;   28. ENQGC (Garbage collection of long term locks)  . . . .  68
;   29. HASH (Calculate hash index)  . . . . . . . . . . . . .  69
;       29.1    MHASH (Hash two numbers) . . . . . . . . . . .  70
;       29.2    STHASH (Hash a string) . . . . . . . . . . . .  71
;   30. ENQFKR (DEQ all requests for a fork) . . . . . . . . .  72
;       30.1    DEQFRK (Worker routine)  . . . . . . . . . . .  73
;   31. ENQJBI (Initialize JSB upon job creation)  . . . . . .  74
;   32. ENQCLS (Check for ENQ lock on OFN) . . . . . . . . . .  75
;   33. ENQINI (Initialize ENQ database upon system startup) .  76
;[7.1072] THE ENQ, DEQ, AND ENQC JSYS'S

REPEAT 0,<

;Q-BLOCK FORMAT


		+-------------------------+-------------------------+
	 0	!ENQLJQ:					    !
		!	BACK POINTER TO LAST Q-BLOCK FOR JOB	    !
		+-------------------------+-------------------------+
	 1	!ENQNJQ:					    !
		!	FORWARD POINTER TO NEXT Q-BLOCK FOR JOB	    !
		+-------------------------+-------------------------+
	 2	!ENQLLQ:					    !
		!	      BACK POINTER TO LAST Q-BLOCK	    !
		+----------------+--------+-------------------------+
	 3	!ENQNLQ:					    !
		!	    FORWARD POINTER TO NEXT Q-BLOCK	    !
		+----------------+--------+-------------------------+
	 4	!ENQFLG:         !ENQCHN: !ENQFRK:                  !
		!      FLAGS     !   PSI  !     FORK TO INTERRUPT   !
		!                ! CHANNEL!  WHEN REQUEST IS LOCKED !
		+----------------+--------+-------------------------+
	 5	!ENQNR:                   !ENQID:                   !
		!      # OF RESOURCES     !     REQUEST ID CODE     !
		!   REQUESTED FROM POOL   !                         !
		+-------------------------+-------------------------+
	 6	!ENQLRQ:					    !
		!	BACK POINTER TO LAST Q-BLOCK OF REQUEST	    !
		+-------------------------+-------------------------+
	 7	!ENQFQ:						    !
		!	FORWARD POINTER TO NEXT Q-BLOCK OF REQUEST  !
		+-------------------------+-------------------------+
	10	!ENQLBP:					    !
		!		POINTER TO LOCK-BLOCK		    !
		+-------------------------+-------------------------+
	11	!	                  !ENQGRP:                  !
		!        	          !    GROUP # FOR          !
		!        RESERVED         !    SHARABLE REQUESTS    !
		+-------------------------+-------------------------+
	12	!ENQNST:		  !ENQJFN:		    !
		!    NEST COUNT		  !	JFN OF REQUEST	    !
		!			  !	OR -1, -2, OR -3    !
		+-------------------------+-------------------------+
	13	!ENQMSK:					    !
		!		POINTER TO MASK-BLOCK		    !
		+-------------------------+-------------------------+
;LOCK-BLOCK FORMAT

;NOTE THAT ITEMS SURROUNDED BY '*' INDICATE THAT THEY ARE PRESENT ONLY
;WHEN THE CLUSTER ENQ CODE IS PRESENT (CLEQIN IS NON-ZERO).

		+-------------------------+-------------------------+
	 0	!ENQLHC:					    !
		!	POINTER TO LAST LOCK-BLOCK ON HASH CHAIN    !
		+-------------------------+-------------------------+
	 1	!ENQNHC:					    !
		!	POINTER TO NEXT LOCK-BLOCK ON HASH CHAIN    !
		+-------------------------+-------------------------+
	 2	!ENQLLQ:					    !
		!	   POINTER TO LAST Q-BLOCK ON QUEUE	    !
		+-------------------------+-------------------------+
	 3	!ENQNLQ:					    !
		!	  POINTER TO FIRST Q-BLOCK ON QUEUE	    !
		+-------------------------+-------------------------+
	 4	!ENQFLG:        !         !ENQLVL:                  !
		!      FLAGS    !         !       LEVEL NUMBER      !
		!               !         !       OF THIS LOCK      !
		+---------------+---------+-------------------------+
	 5	!ENQTR:                   !ENQRR:                   !
		!   TOTAL # OF RESOURCES  !    REMAINING NUMBER OF  !
		!        IN THIS POOL     !  RESOURCES IN THIS POOL !
		+-------------------------+-------------------------+
	 6	!ENQTS:                                             !
		!                   TIME STAMP                      !
		!           TIME OF LAST REQUEST LOCKED             !
		+-------------------------+-------------------------+
	 7	!ENQFBP:					    !
		!		POINTER TO FREE Q-BLOCK		    !
		+-------------------------+-------------------------+
	10	!ENQLT:						    !
		!	  LONG TERM LOCK LIST FOR SYSTEM  	    !
		+-------------------------+-------------------------+
	11	!ENQOFN:                  !ENQLEN:                  !
		!    OFN, OR -2, OR -3,   !      LENGTH OF THIS     !
		!  OR 400000 + JOB NUMBER !        LOCK-BLOCK       !
		+-------------------------+-------------------------+
	12	!ENQNMS:		  !*ENQHSH:* 		    !
		!    NUMBER OF WORDS IN   !   HASH VALUE FOR THIS   !
		!      THE MASK BLOCK	  !	LOCK BLOCK	    !
		+-------------------------+-------------------------+
       *13*	!ENQAFP:					    !
		!    FORWARD POINTER FOR LOCK BLOCK ACTION LIST     !
		+-------------------------+-------------------------+
       *14*	!ENQABP:					    !
		!    BACKWARD POINTER FOR LOCK BLOCK ACTION LIST    !
		+-------------------------+-------------------------+
	15	!ENQTXT:             ASCIZ STRING                   !
		!                        OR                         !
		!                 500000 + USER CODE                !
		+---------------------------------------------------+
FORMAT OF ENQ% ARGUMENT BLOCK:

		!0           8!9        17!18			  35!
		+-------------+-----------+-------------------------+
.ENQLN:	 0	!   HDR SIZE  !  # LOCKS  !    ARG BLOCK LENGTH     !
		+-------------------------+-------------------------+
.ENQID:	 1	!       PSI CHANNEL       !       REQUEST ID        !
		+-------------------------+-------------------------+
		+-------------------------+-------------------------+
.ENQLV:	 2	!    FLAGS    !  LEVEL #  !          JFN            !
		!			  !     or -1, -2, or -3    !
		+-------------------------+-------------------------+
.ENQUC:	 3	!      STRING POINTER OR 5B2+33-BIT USER CODE       !
		+-------------------------+-------------------------+
.ENQRS:	 4	!   # RESOURCES IN POOL   !  # RESOURCES REQUESTED  !
		!			  or			    !
		!	     0		  !          GROUP #        !
		+-------------------------+-------------------------+
.ENQMS:  5      !               ADDRESS OF MASK BLOCK               !
		+-------------------------+-------------------------+


>	;END OF REPEAT 0
	SUBTTL	The ENQ% JSYS

;THE ENQ JSYS

;ACCEPTS IN 1/	FUNCTION CODE
;	    2/	LOCATION OF ARGUMENT BLOCK
;	ENQ
;RETURNS +1:	ERROR - ERROR CODE IN T1
;	 +2:	SUCCESSFUL, SPECIFIED LOCKS ARE LOCKED

;THE ARGUMENT BLOCK HAS THE FOLLOWING FORMAT:
;LOC/		# OF LOCKS ,, LENGTH OF ARG BLOCK
;LOC+1/		PSI CHANNEL # ,, REQUEST ID
;LOC+2/		FLAGS & LEVEL NUMBER ,, JFN, -1, -2, OR -3
;LOC+3/		POINTER TO STRING OR 500000+USER CODE
;LOC+4/		# OF RESOURCES IN POOL ,, # OF RESOURCES REQUESTED
;			.
;			.
;			.
;LOC+N/		FLAGS & LEVEL NUMBER ,, JFN, -1, -2, OR -3
;LOC+N+1/	POINTER TO STRING OR 500000 + USER CODE
;LOC+N+2/	# OF RESOURCES IN POOL ,, # OF RESOURCES REQUESTED

 	SWAPCD			;[7.1040]

.ENQ::	MCENT			;ENTER JSYS
	NOINT			;DONT ALLOW INTERRUPTS DURING CALL
	LOKK ENQLKK		;LOCK UP THE ENQ DATA BASE
   IFN CLEQIN,<			;[7.1072] 
	STKVAR <OLDWRD>		;[7.1072] 
	MOVE T1,ENQWRD		;[7.1072] Get the ENQ word for the process
	MOVEM T1,OLDWRD		;[7.1072] Remember it for later
	TXNE T1,EQ%ENA		;[7.1072] Has fork enabled cluster-wide ENQ?
	CALL CFEQLK		;[7.1072] ()Now lock database cluster-wide
   >				;[7.1072] 
	SETO T1,		;MARK THAT THIS IS A NORMAL TYPE ENQ
	CALL ENQREQ		;GO SERVICE THIS REQUEST
	 JRST ENUNLE		;ERROR RETURN, GO UNLOCK
	UMOVEM T2,1		;RETURN ANSWER FOR USER
   IFN CLEQIN,<			;[7.1072] 
	MOVE CX,OLDWRD		;[7.1072] Get original ENQ word
	TXNE CX,EQ%ENA		;[7.1072] Had fork enabled cluster-wide ENQ?
	CALL CFEQUL		;[7.1072] ()Unlock database cluster-wide
   >				;[7.1072] 
	UNLOKK ENQLKK		;FREE UP THE DATA BASE
	OKINT			;ALLOW INTERRUPTS
	SKIPE T1		;DO MDISMS?
	MDISMS			;YES, WAIT FOR LOCK TO FREE UP
	SMRETN			;GIVE SUCCESSFUL RETURN TO USER

ENUNLE:	CALL ULOKIT		;[7.1072] ()Release the database locks
	RETERR			;GIVE ERROR RETURN TO USER

   IFN CLEQIN,<			;[7.1072] 
	ENDSV.			;[7.1072] 
   >				;[7.1072] 
;[7.1072]
;LOCKIT - Routine to obtain the local ENQ Database lock and the 
;         cluster-wide one if necessary.
;
;Returns +1:	Always, with lock(s) obtained and NOINT.

;	SWAPCD

LOCKIT:	NOINT			;[7.1072] Must be NOINT for lock
	LOKK ENQLKK		;[7.1072] Get local database lock first
   IFN CLEQIN,<			;[7.1072] 
	MOVE CX,ENQWRD		;[7.1072] Get ENQ word
	TXNE CX,EQ%ENA		;[7.1072] Has fork enabled cluster-wide ENQ?
	CALL CFEQLK		;[7.1072] ()Now lock database cluster-wide
   >				;[7.1072] 
	RET			;[7.1072] Done

;[7.1072]
;ULOKIT - Routine to release the local ENQ Database lock and the 
;         cluster-wide one if necessary.
;
;Must be called NOINT and with the lock(s) obtained.
;
;Returns +1:	Always, with lock(s) released and OKINT.

;	SWAPCD

ULOKIT:				;[7.1072]
   IFN CLEQIN,<			;[7.1072] 
	MOVE CX,ENQWRD		;[7.1072] Get ENQ word
	TXNE CX,EQ%ENA		;[7.1072] Has fork enabled cluster-wide ENQ?
	CALL CFEQUL		;[7.1072] ()Unlock database cluster-wide
   >				;[7.1072] 
	UNLOKK ENQLKK		;[7.1072] Unlock the local database
	OKINT			;[7.1072] No longer need to be NOINT
	RET			;[7.1072]
REPEAT 0,<
;INTERNAL MONITOR ROUTINE TO ENQ ON A 33-BIT NUMBER

;ACCEPTS IN T1/	33-BIT NUMBER
;ASSUMES A -3 LOCK, LEVEL # OF 0, ONE LOCK, ID = 0, AND ALWAYS WAIT
;	CALL ENQUE
;RETURNS +1:	ALWAYS, LOCK LOCKED

ENQUE:	CALL LOCKIT		;[7.1072] ()Obtain needed database locks
	SAVEPQ			;SAVE ALL PERMANENT ACS
	CALL MONVAL		;GET ARGUMENTS SET UP
	CALL ENQREQ		;DO THE ENQ
	 BUG(ENQMLF)
	CALL ULOKIT		;[7.1072] ()Release the database locks
	SKIPE T1		;NEED TO MDISMS?
	MDISMS			;YES, WAIT TILL LOCK IS LOCKED
	RET			;AND RETURN


;ROUTINE TO SET UP Q1-Q3, P1-P5 FOR INTERNAL ENQ AND DEQ CALLS

;	CALL MONVAL
;RETURNS +1:	ALWAYS

MONVAL:	TLZ T1,700000		;SET UP 500000,,0 + 33-BIT NUMBER
	TLO T1,500000
	MOVE P2,T1		;P2 = USER CODE TO LOCK ON
	MOVEI P1,-3		;P1 = LEVEL 0, -3 LOCK TYPE
	SETZB Q1,Q2		;Q1 = 1 LOCK, Q2 = 0 ID VALUE
	SETZB Q3,P3		;MONITOR LEVEL = 0, EXCULSIVE LOCK
	SETZB T1,P5		;SHARABLE GROUP 0
	RET

>				;[7.1072]
;ROUTINE TO SET UP GLOBAL VARIABLES USED BY CALLERS OF VALARG AND VALREQ

;	JSP T1,SETVAR
;RETURNS +1:	ALWAYS

	XSWAPCD			;[7.1040]

SETVAR:	TRVAR <EDNMS,EDMSK,EDSTP,EDSTB>
	CALLRET 0(T1)

;EDNMS = NUMBER OF WORDS IN THE MASK BLOCK (MINUS COUNT WORD)
;EDMSK = ADDRESS OF THE FIRST MASK WORD OF MASK BLOCK 
;EDSTP = -1 ,, LENGTH OF LOCK REQUEST BLOCK
;EDSTB = ADDRESS OF STATUS BLOCK FOR ENQC FUNCTION 0
	SUBTTL	The ENQ% JSYS -- ENQREQ (Worker routine for .ENQ)

;ROUTINE TO DO THE ENQ JSYS

;THIS ROUTINE MUST BE CALLED NOINT AND WITH ENQLKK LOCKED
;ACCEPTS IN T1/	 0 = INTERNAL MONITOR CALL
;		-1 = NORMAL JSYS CALL
;	CALL ENQREQ
;RETURNS +1:	ERROR - CODE IN T1
;	 +2:	OK
;		T1 = 0, REQUEST IS LOCKED
;		T1 NOT 0, DO MDISMS FIRST, THEN RETURN
;		T2 = VALUE TO BE RETURNED IN USER AC 1

XNENT	(ENQREQ)		;[7.1040] ENQREQ: and XENQRE:
	JSP T1,SETVAR		;SET UP GLOBAL VARIABLES
	STKVAR <ENQFC,ENQHI,ENQQ,ENQLB,ENQERC,ENQOKR>
   IFN CLEQIN,<			;[7.1072] 
	XCTU [HRRZ T4,T1]	;[7.1072] Get user's function code
	CAIE T4,.ENECL		;[7.1072] Enabling cluster wide functionality?
	IFSKP.			;[7.1072] Yes
	  MOVE T4,ENQWRD	;[7.1072] Get the ENQWRD for the process
	  TXO T4,EQ%ENA		;[7.1072] Set enabled bit
	  MOVEM T4,ENQWRD	;[7.1072] Replace new word
	  SETZ T1,		;[7.1072] Say request was satisfied
	  MOVEI T2,.ENECL	;[7.1072] Preserve user's AC1
	  RETSKP		;[7.1072] Return success
	ENDIF.			;[7.1072] 
   >				;[7.1072] 
	SETZM ENQFC		;INITIALIZE FUNCTION CODE 
	JUMPE T1,ENQ5		;IF 0, THIS IS A MONITOR CALL
	SETZM ENQERC		;INITIALIZE ERROR CODE REGISTER
	SETZM ENQOKR		;INITIALIZE OK RETURN ANSWER
	SETZM ENQQ		;INITIALIZE THE Q-BLOCK ADDDRESS
	SETZM ENQLB		;INITIALIZE LOCK BLOCK ADDRESS
	CALL VALARG		;VALIDATE THE USER'S ARGUMENT BLOCK
	 RET			;SOMETHING ILLEGAL
	XCTU [HRRZ T1,1]	;GET FUNCTION CODE
	CAILE T1,ENQMFN		;MAKE SURE IT IS LEGAL
	RETBAD (ENQX1)		;OUT OF BOUNDS, GIVE ERROR RETURN
	MOVEM T1,ENQFC		;SAVE FUNCTION CODE FOR LATER
	CAIN T1,0		;IS THIS FUNCTION 0?
	HRRI Q2,.ENWCH		;YES, MARK THE WAKFRK IS TO BE CALLED
ENQ0:	CALL VALREQ		;VALIDATE THIS LOCK REQUEST
	 JRST ENQERR		;UNDO WHAT WAS JUST DONE
ENQ5:	MOVE T1,ENQFC		;GET FUNCTION CODE
	CAIN T1,.ENQMA		;IS IT MODIFY ACCESS FUNCTION?
	JRST ENQFN3		;YES, HANDLE THIS SEPERATELY
	CALL HASH		;HASH THIS REQUEST
	 JRST ENQERR		;COULDNT HASH, GO UNDO REQUEST
	MOVEM T1,ENQHI		;REMEMBER THE HASH INDEX VALUE
	CALL FNDLOK		;(T1,P1-P4/T1) FIND THE LOCK BLOCK
	 JRST [	MOVE T1,ENQHI	;NO LOCK BLOCK, GET HASH INDEX AGAIN
		CALL CRELOK	;(T1,P1-P4/T1) CREATE A LOCK BLOCK FOR THIS LOCK
		 JRST ENQERR	;FAILED! GO UNDO REQUEST
		MOVEM T1,ENQLB	;SAVE THE LOCK-BLOCK ADDRESS
		JRST ENQ9]
	MOVEM T1,ENQLB		;SAVE THE LOCK-BLOCK ADDRESS
;   IFN CFSCOD,<			;If CFS stuff
	LOAD T2,ENQFLG,(T1)	;GET LOCK BLOCK FLAGS
	TXNN T2,EN.LTL		;LONG TERM LOCK?
	IFSKP.
	  LOAD T2,ENQNLQ,(T1)	;[7348] Now see if the lock is free
	  CAME T2,T1		;[7348] It is free if it points to itself
	  ANSKP.		;[7348] Yes, it is free
	    CALL CFETST		;[7348] (P1/) Must check if owned CFS resource?
	     JRST ENQERR	;[7348] Yes - owned on another system 
	    MOVE T1,ENQLB	;[7348] Ok to lock - retrieve the Lock-block address
   IFN CLEQIN,<			;[7.1072]
	    LOAD T2,ENQFLG,(T1)	;[7.1072] Get the flags from Lock-Block
	    TXZ T2,EN.CLL	;[7.1179] Assume not a cluster-wide lock
	    STOR T2,ENQFLG,(T1)	;[7.1072] Replace the flags in Lock-Block
	    JRST ENQ9		;[7.1072] Skip consistency check
   >				;[7.1072]
	ENDIF.
;   >	;IFN CFSCOD
   IFN CLEQIN,<			;[7.1072] 
;[7.1072] At this point, we have a lock which is active (has at least one 
;[7.1072] Q-Block associated with it).  We must check for consistent modes
;[7.1072] for locks which are on files.

	LOAD T2,ENQOFN,(T1)	;[7.1072] Get the type of lock
	HRRES T2		;[7.1072] Extend the sign
	SKIPGE T2		;[7.1072] Is this a file lock?
	IFSKP.			;[7.1072] Yes, must check for consistent mode
	  LOAD T2,ENQFLG,(T1)	;[7.1072] Get lock block flags
	  MOVE T3,ENQWRD	;[7.1072] Get ENQ word for this process
	  TXNN T2,EN.CLL	;[7.1072] Is this marked as cluster-wide?
	  IFSKP.		;[7.1072] Yes
	    TXNN T3,EQ%ENA	;[7.1072] Process better have cluster-wide privs
	    JRST ENQMER		;[7.1072] Doesn't - return the error
	  ELSE.			;[7.1072] No
	    TXNE T3,EQ%ENA	;[7.1072] Better not have cluster-wide privs
	    JRST ENQMER		;[7.1072] Does - return the error
	  ENDIF.		;[7.1072]
	ENDIF.			;[7.1072] 
   >				;[7.1072]
ENQ9:	LOAD T2,ENQNMS,(T1)	;GET SIZE OF MASK BLOCK FROM LOCK BLOCK
	JUMPE T2,ENQ8		;IF NONE SPECIFIED YET, THEN OK
	CAME T2,EDNMS		;IF NOT 0, THEN BOTH BLOCKS MUST BE EQUAL
	SKIPN EDNMS		;UNLESS THE CALLER IS NOT GIVING A BLOCK
	SKIPA			;MASK BLOCKS ARE COMPATIBLE
	RETBAD (ENQX23)		;MISMATCHED MASK BLOCK SIZE
ENQ8:	LOAD T2,ENQLVL,(T1)	;GET LEVEL NUMBER OF THIS LOCK
	HRRZ T4,P1		;GET OFN
	HRRE T3,Q3		;GET USER MINIMUM LOCK LEVEL
	CAIN T4,-3		;IS THIS A MONITOR LOCK?
	HLRE T3,Q3		;YES, GET MONITOR MINIMUM LEVEL
	CAMG T2,T3		;IS THIS LEVEL NUMBER LEGAL?
	JRST [	TLNE P1,(EN%BLN)	;USER BYPASSING LEVEL NUMBERS?
		JRST [	MOVEI T3,ENQX2	;YES, SET UP ANSWER FOR USER
			MOVEM T3,ENQOKR
			JRST ENQ4]
		MOVEI T1,ENQX2	;NO, GO UNDO THE REQUEST
		JRST ENQERR]
	;..
	;..
ENQ4:	LDB T3,[POINT 9,P1,17]	;GET LEVEL NUMBER SPECIFIED IN REQ
	CAME T2,T3		;LEVEL NUMBERS MATCH?
	JRST [	TLNE P1,(EN%BLN)	;BYPASSING LEVEL #'S?
		JRST [	MOVEI T3,ENQX3	;YES, SET UP ERROR CODE
			MOVEM T3,ENQOKR	;FOR SKIP RETURN
			JRST ENQ6]
		MOVEI T1,ENQX3	;NO, THIS IS ILLEGAL
		JRST ENQERR]	;GO UNDO EVERYTHING
ENQ6:	LOAD T2,ENQTR,(T1)	;GET TOTAL NUMBER OF RESOURCES IN POOL
	HLRZ T3,P3		;GET USER'S VALUE
	CAME T2,T3		;ARE THEY IDENTICAL?
	JRST [	MOVEI T1,ENQX4	;NO, THIS IS NOT ALLOWED
		JRST ENQERR]	;GO UNDO
	CALL FNDQ		;SEE IF THERE IS ALREADY A REQUEST IN
	 SKIPA T1,ENQLB		;NO, GET LOCK BLOCK BACK
	JRST [	TXNE P1,EN%NST	;NESTED LOCK?
		JRST ENQ7	;YES
		MOVEI T1,ENQX5	;YES, THIS IS NOT ALLOWED
		JRST ENQERR]	;GO UNDO THE REQUEST
	MOVE T2,ENQQ		;GET LAST Q-BLOCK IN THIS REQUEST
	SETZ T3,		;INITIALIZE FLAGS
	JUMPN P3,ENQ1		;IF POOLED REQUEST, DONT SET ANY FLAGS
	TLNN P1,(EN%SHR)	;IS THIS A SHARED REQUEST
	TRO T3,EN.EXC		;NO, SET EXCLUSIVE FLAG
   IFN CLEQIN,<			;[7.1072] 
ENQ1:	MOVE CX,ENQWRD		;[7.1072] Get ENQ word
	TXNE CX,EQ%ENA		;[7.1072] Has fork enabled cluster-wide ENQ?
	TXO T3,EN.CLL		;[7.1072] Yes, remember this in Q-Block
	CALL CREQ		;[7.1072] (T1,T2,T3/T1)Create the Q-Block
	 JRST ENQERR		;[7.1072] Failed, go undo the request
        MOVEM T1,ENQQ		;[7.1072] Save Q-Block address for other entries
	CALL EQEOKR		;[7.1072] (T1/T1)Perform cluster-wide arbitration
	 JRST ENQERR		;[7.1072] Failed, go undo the request
   >				;[7.1072] 
   IFE CLEQIN,<			;[7.1072] 
ENQ1:	CALL CREQ		;CREATE THE Q-BLOCK FOR THE REQUEST
	 JRST ENQERR		;FAILED, GO UNDO THE REQUEST
        MOVEM T1,ENQQ		;[7.1072] SAVE THE Q-BLOCK ADR FOR OTHER ENTRIES
   >				;[7.1072] 
ENQ2:	ADD Q1,EDSTP		;ADVANCE THE POINTER TO THE NEXT REQ
	JUMPG Q1,ENQ0		;LOOP BACK FOR ALL REQUESTS
	SKIPE T1,ENQERC		;ANY ERRORS SEEN?
	RET			;YES, TAKE ERROR RETURN NOW
	SKIPN T1,ENQQ		;GET A Q-BLOCK ADDRESS IF ANY
	JRST ENQ3		;NONE, MUST BE CHANGE ACCESS CALL
	CALL QSKD		;DO A SCHEDULING PASS OVER QUEUE
	 JRST ENQNL		;LOCK NOT LOCKED
ENQ3:	SETZ T1,		;FLAG THAT MDISMS IS NOT NEEDED
	MOVE T2,ENQOKR		;SET UP USER'S AC
	RETSKP			;REQUEST IS FULLY LOCKED
ENQ7:				;[7.1072] Here if nesting a lock request
   IFN CLEQIN,<			;[7.1072] 
	CALL EQEOKR		;[7.1072] (T1/T1)Perform cluster-wide arbitration
	 JRST ENQERR		;[7.1072] Failed, go undo the request
   >				;[7.1072] 
	INCR ENQNST,(T1)	;COUNT UP THE NEST COUNT
        MOVEM T1,ENQQ		;[7.1072] SAVE THE Q-BLOCK ADR FOR OTHER ENTRIES
        JRST ENQ2		;[7.1072] AND ALLOW THIS ENQ TO CONTINUE

ENQNL:	MOVE T1,ENQFC		;GET THE FUNCTION CODE
	JRST @ENQNLT(T1)	;GO PERFORM THE PROPER EXITING

ENQNLT:	XADDR. (ENQWAT)		;[7.1040] 0 - WAIT UNTIL LOCKED
	XADDR. (ENQDEQ)		;[7.1040] 1 - DEQ THIS REQUEST
	XADDR. (ENQRET)		;[7.1040] 2 - JUST EXIT AND WAIT FOR INTERRUPT


ENQWAT:	MOVE T1,FORKX		;WAIT UNTIL THE REQUEST IS SATISFIED
	CALL <XENT GETMSK>	;[7.1040] CLEAR OUT WAITING CONDITION
	ANDCAM T2,ENFKTB(T1)	;...
	HRRI T1,ENQTST		;SET UP FOR MDISMS
	HRL T1,FORKX
	RETSKP			;RETURN AND DO AN MDISMS UNTIL LOCKED

ENQDEQ:	MOVE T1,ENQQ		;GET Q-BLOCK ADDRESS
	CALL REQDEQ		;DEQUEUE THIS REQUSET
ENQRET:	MOVEI T1,ENQX6		;GET "LOCK NOT SET" ERROR CODE
	RET			;GIVE ERROR RETURN

   IFN CLEQIN,<			;[7.1072] 
ENQMER:	MOVEI T1,OPNX9		;[7.1072] Invalid mode for file lock
   >				;[7.1072] 
ENQERR:	MOVEM T1,ENQERC		;SAVE ERROR CODE
	SKIPN T1,ENQLB		;WAS A LOCK-BLOCK FOUND?
	JRST ENQER1		;NO, JUST EXIT
	LOAD T2,ENQNLQ,(T1)	;IS IT AN EMPTY LOCK-BLOCK?
	CAMN T2,T1		;...
	CALL LOKREL		;YES, DELETE IT
	SKIPE T1,ENQQ		;WAS A Q-BLOCK CREATED?
	CALL REQDEQ		;YES, DELETE THE REQUEST
ENQER1:	MOVE T1,ENQERC		;GET ERROR CODE BACK
	RET			;AND GIVE NON-SKIP RETURN
	SUBTTL	The ENQ% JSYS -- ENQFN3 (The .ENQMA function of ENQ%)

;FUNCTION CODE 3 (.ENQMA)

ENQFN3:	CALL HASH		;HASH THIS REQUEST
	 JRST ENQF3F		;ERROR
	CALL FNDLOK		;FIND THE LOCK BLOCK
	 JRST ENQF3F		;NOT ENQ'D ON THIS LOCK
	MOVEM T1,ENQLB		;SAVE LOCK-BLOCK ADDRESS
	CALL FNDQ		;FIND THE Q-BLOCK FOR THIS REQUEST
	 JRST ENQF3F		;NOT ENQ'D ON THIS LOCK
	LOAD T2,ENQTR,(T1)	;GET TOTAL # REQUESTED
	JUMPN T2,ENQF3E		;CANT CHANGE POOLED REQUESTS
	LOAD T2,ENQFLG,(T1)	;GET FLAGS OF REQUEST
	TLNE P1,(EN%SHR)	;WANT IT TO BE SHARABLE
	JRST [	TRZN T2,EN.EXC	;YES, SET IT SHARABLE
		JRST ENQ2	;ALREADY WAS SHARABLE
		STOR T2,ENQFLG,(T1) ;STORE UPDATED FLAGS
		MOVE T1,ENQLB	;GET LOCK BLOCK ADDRESS AGAIN
		CALL LOKSKD	;SCHEDULE THIS LOCK
		JRST ENQ2]	;LOOP BACK FOR ALL REQUESTS
	TROE T2,EN.EXC		;SEE IF ALREADY EXCLUSIVE
	JRST ENQ2		;YES, THIS IS OK SINCE NOT CHANGING IT
	LOAD T3,ENQLLQ,(T1)	;SEE IF THIS IS THE ONLY SHARER
	LOAD T4,ENQNLQ,(T1)	;GET POINTER TO LAST AND NEXT Q-BLOCK
	CAME T3,T4		;IF EQUAL, THEN THIS IS THE ONLY SHARER
	JRST ENQF3E		;NOT EQUAL, GIVE ERROR RETURN
   IFN CLEQIN,<			;[7.1072]
	MOVEM T1,ENQLB		;[7.1072] Save the Q-Block address for a moment
	CALL EQCNTS		;[7.1072] (T1/T1)Check the remote counts
	JUMPN T1,ENQF3E		;[7.1072] Can't change if any count returned
	MOVE T1,ENQLB		;[7.1072] Restore Q-Block address
   >				;[7.1072] 
	STOR T2,ENQFLG,(T1)	;MAKE THIS BE AN EXCLUSIVE LOCK
	JRST ENQ2		;AND LOOP BACK FOR THE OTHERS

ENQF3E:	MOVEI T1,ENQX8		;FUNCTION 3 ERROR
ENQF3F:	MOVEM T1,ENQERC		;REMEMBER THAT AN ERROR OCCURED
	JRST ENQ2		;GO DO AS MUCH AS POSSIBLE
	SUBTTL	The ENQ% JSYS -- CFETST (CFS resource check on OFNs)

;CHECK TO SEE IF OFN IS AN OWNED CFS RESOURCE
;ACCEPTS:	P1/ OFN
;RETURNS:	+1  ALREADY OWNED
;		+2  AVAILABLE FOR LOCKING

;   IFN CFSCOD,<			;If doing CFS ENQ detection
CFETST:	HRRE T1,P1		;Get the OFN
	IFG. T1			;Is this a CFS lock?
	 CALLX (MSEC1,CFSENQ)	;[7.1040] Yes. Do ENQ stuff then
	  RETBAD (OPNX9)	;File is busy! CAN'T HAVE LOCK
	ENDIF.
	RETSKP
;   >	;IFN CFSCOD
	SUBTTL	The DEQ% JSYS

;THE DEQ JSYS - DEQUEUE REQUESTS

;ACCEPTS IN 1/	FUNCTION
;	    2/	LOCATION OF ARGUMENT BLOCK  (FUNCTION 0 ONLY)
;	DEQ
;RETURNS +1:	UNSUCCESSFUL - ERROR CODE IN T1 
;				(AS MUCH AS POSSIBLE DEQUEUED)
;	 +2:	SUCCESSFUL - REQUEST DEQUEUED

;THE ARGUMENT BLOCK IS IDENTICAL TO THAT OF ENQ

	SWAPCD			;[7.1040] 

.DEQ::	MCENT			;ENTER JSYS
        CALL LOCKIT		;[7.1072] ()Obtain needed database locks
	CALL DEQREQ		;GO DO THE DEQUEUEING
	 JRST ENUNLE		;ERROR DURING DEQ, RETURN ERROR CODE
DEQOKR:	CALL LGTAD		;GET TIME OF DAY
	CAMLE T1,ENQLTS		;IS IT TIME TO DO A GARBAGE COLLECT?
	JRST [	ADDI T1,^D<10*60*3> ;YES, SAVE TIME OF NEXT GC
		EXCH T1,ENQLTS	;DO A GARBAGE COLLECT EVERY 10 MINUTES
		CALL ENQGC
		JRST .+1]
	CALL ULOKIT		;[7.1072] ()Release the database locks
	SMRETN			;GIVE SUCCESSFUL RETURN TO USER
	SUBTTL	The DEQ% JSYS -- DEQREQ (Worker routine for .DEQ)

;ROUTINE TO DO THE ACTUAL DEQUEUEING

;	XSWAPCD			;[7.1040] 

XNENT	(DEQREQ)		;[7.1040] DEQREQ: and XDEQRE:
	XCTU [HRRZ T2,1]	;GET THE FUNCTION CODE
	CAIL T2,DQTABL		;IS THIS A LEGAL FUNCTION CODE?
	RETBAD (ENQX1)		;NO, TELL USER
	SETO T1,		;THIS IS A JSYS CALL
	JRST @DEQTAB(T2)	;DISPATCH TO FUNCTION CODE

DEQTAB:	XADDR. (DEQFN0)		;[7.1040] NORMAL DEQ
	XADDR. (DEQFN1)		;[7.1040] DEQ ALL RESOURCES
	XADDR. (DEQFN2)		;[7.1040] DEQ THIS ID
DQTABL==.-DEQTAB

REPEAT 0,<

;INTERNAL MONITOR ROUTINE TO DO A DEQ (FUNCTION 0 ONLY)

;ACCEPTS IN T1/	33-BIT NUMBER
;ASSUMES A -3 LOCK, LEVEL # OF 0, ONE LOCK, ID = 0, AND ALWAYS WAIT
;	CALL DEQUE
;RETURNS +1:	ALWAYS

DEQUE:  CALL LOCKIT		;[7.1072] ()Obtain needed database locks
	SAVEPQ			;SAVE THE PERMANENT ACS
	CALL MONVAL		;SET UP THE ARGUMENTS IN Q1-Q3, P1-P4
	CALL DEQFN0		;DO THE DEQ
	 BUG(DEQMDF)
	CALL ULOKIT		;[7.1072] ()Release the database locks
	RET			;AND RETURN TO CALLER
>
	SUBTTL	The DEQ% JSYS -- DEQFN0 (Function 0)

;DEQ FUNCTION 0

;ACCEPTS IN T1/	 0 = INTERNAL MONITOR CALL
;		-1 = JSYS CALL  (READ ARGUMENTS FROM USER SPACE)

DEQFN0:	JSP T1,SETVAR		;SET UP GLOBAL VARIABLES
	STKVAR <DQFN0T,DQFN0Q>
	SETZM DQFN0T		;INITIALIZE ERROR COUNTER
	JUMPE T1,DQFN0D		;IF MONITOR CALL, ARGS ARE SET UP
	CALL VALARG		;VALIDATE THE ARGUMENT BLOCK
	 RET			;ILLEGAL ARGUMENT BLOCK
DQFN0A:	CALL VALREQ		;VALIDATE THIS LOCK SPECIFICATION
	 JRST DQFN0B		;ERROR
DQFN0D:	CALL HASH		;HASH THIS REQUEST
	 JRST DQFN0B		;ERROR DURING HASH
	CALL FNDLOK		;FIND THE LOCK-BLOCK
	 JRST DQFN0B		;NO SUCH LOCK-BLOCK
	LOAD T2,ENQFLG,(T1)	;GET FLAGS OF THE LOCK BLOCK
   IFN CLEQIN,<			;[7.1072] 
	SKIPE ELBCSH		;[7.1072] Is Lock-Block caching enabled?
	TXO T2,EN.LTL		;[7.1072] Yes, so set LTL always
   >				;[7.1072] 
	TXNE P1,EN%LTL		;IS THIS A LONG TERM LOCK
	TXO T2,EN.LTL		;YES, REMEMBER THIS IN THE LOCK BLOCK
	STOR T2,ENQFLG,(T1)
	CALL FNDQ		;FIND THE Q-BLOCK FOR THIS FORK
	 JRST DQFN0B		;COULD NOT FIND THE Q-BLOCK
	MOVEM T1,DQFN0Q		;SAVE THE Q-BLOCK ADDRESS
	LOAD T2,ENQNST,(T1)	;GET NEST COUNT
	JUMPG T2,[DECR ENQNST,(T1)
		JRST DQFN0C]	;THIS WAS A NESTED ENQ, DONT DEQ IT
	LOAD T2,ENQNR,(T1)	;GET NUMBER LOCKED IN ORIGINAL ENQ
	JUMPE T2,[CALL DEQMSK	;IF 0, SEE IF DEQ'ING A MASK
		 JRST DQFN0E	;NOT COMPLETELY DEQUEUED
		MOVE T1,DQFN0Q	;OK TO DELETE THIS Q-BLOCK
		CALL SQDEQ	;GO DELETE THIS Q-BLOCK
		JRST DQFN0C]	;STEP TO NEXT REQUEST
	SUBI T2,0(P3)		;SEE IF DEQ'ING ALL RESOURCES
	JUMPL T2,[MOVEI T1,ENQX12
		JRST DQFN0B]	;DEQ'ING TOO MANY RESOURCES
	JUMPE T2,[CALL SQDEQ	;DEQ'ING ALL OF THEM, DELETE Q-BLOCK
		JRST DQFN0C]
	STOR T2,ENQNR,(T1)	;PUT BACK NEW # OF RESOURCES LOCKED
	LOAD T1,ENQLBP,(T1)	;GET ADDRESS OF LOCK BLOCK
	LOAD T2,ENQRR,(T1)	;GET # OF REMAINING RESOURCES
	ADDI T2,0(P3)		;UPDATE THE COUNT
	STOR T2,ENQRR,(T1)	;STORE NEW COUNT OF REMAINING RESOURCES
DQFN0E:	MOVE T1,DQFN0Q		;GET Q-BLOCK ADDRESS
	LOAD T1,ENQLBP,(T1)	;GET ADDRESS OF THE LOCK BLOCK
	CALL LOKSKD		;GO SCHEDULE THIS LOCK
	JRST DQFN0C		;DONT COUNT UP ERROR COUNTER
DQFN0B:	MOVEM T1,DQFN0T		;SAVE THIS ERROR CODE
DQFN0C:	ADD Q1,EDSTP		;STEP TO THE NEXT LOCK REQUEST
	JUMPG Q1,DQFN0A		;LOOP BACK FOR ALL LOCKS
	SKIPG T1,DQFN0T		;ANY ERRORS SEEN?
	RETSKP			;NO, DEQUEUING COMPLETED
	RET			;YES, RETURN ERROR CODE IN T1
	SUBTTL	The DEQ% JSYS -- DEQMSK (Check for fully DEQed request)

;ROUTINE TO SEE IF A REQUEST IS COMPLETELY DEQ'ED
;ACCEPTS IN T1/	Q-BLOCK ADDRESS
;	CALL DEQMSK
;RETURNS +1:	NOT COMPLETELY DEQUEUED
;	 +2:	OK TO DELETE THIS Q-BLOCK

DEQMSK:	STKVAR <DEQMSF>
	SETZM DEQMSF		;INITIALIZE THE FLAG WORD
	SKIPN T4,EDMSK		;IS THERE A MASK SPECIFIED?
	RETSKP			;NO, THEN DEQ THE WHOLE THING
	LOAD T3,ENQMSK,(T1)	;GET THE POINTER TO THE MASK BLOCK
	JUMPE T3,RSKP		;IF NONE, THEN DEQ THE WHOLE THING
	LOAD T2,ENQLBP,(T1)	;GET LOCK BLOCK ADDRESS
	LOAD T2,ENQNMS,(T2)	;GET LENGTH OF MASK BLOCK
	CAMLE T2,EDNMS		;DO THE LENGTHS MATCH?
	SETOM DEQMSF		;NO, MARK THIS AS NOT COMPLETELY DEQ'D
	CAMLE T2,EDNMS		;GET THE LESSER OF THE TWO LENGTHS
	MOVE T2,EDNMS		;...
DEQMS1:	MOVE T1,0(T3)		;GET FIRST WORD OF MASK BLOCK
	XCTU [ANDCM T1,0(T4)]	;TURN OFF THE BITS BEING DEQUEUED
	MOVEM T1,0(T3)		;UPDATE THE MASK IN THE Q-BLOCK
	SKIPE T1		;ANY RESOURCES LEFT ON?
	SETOM DEQMSF		;YES, MARK THAT THE LOCK IS STILL LOCKED
	AOS T3			;STEP THE MASK POINTER
	AOS T4			;STEP THE USER MASK POINTER
	SOJG T2,DEQMS1		;LOOP BACK THROUGH THE WHOLE MASK BLOCK
	SKIPE DEQMSF		;ANY PART OF THE LOCK STILL LOCKED?
	RET			;YES
	RETSKP			;NO, GO DELETE IT
	SUBTTL	The DEQ% JSYS -- DEQFN1 (Function 1)

;DEQ FUNCTION 1

DEQFN1:	HRRZ T1,FORKX		;GET SYSTEM FORK HANDLE
	SETO T2,		;DEQ ALL
	CALL <XENT DEQFRK>	;[7.1040] DELETE ALL REQUESTS FOR THIS FORK
	JUMPG T1,RSKP		;WERE ANY RELEASED?
	RETBAD (ENQX7)		;NO, THIS IS AN ERROR
 	SUBTTL	The DEQ% JSYS -- DEQFN2 (Function 2)

;DEQ FUNCTION 2 - DEQ AN ID

DEQFN2:	HRRZ T1,FORKX		;FOR THIS FORK ONLY
	XCTU [HRRZ T2,2]	;GET THE ID
	CALL <XENT DEQFRK>	;[7.1040] DEQ THIS ID ONLY
	JUMPG T1,RSKP		;WERE ANY RELEASED?
	RETBAD (ENQX7)		;NO, THIS IS AN ERROR
	SUBTTL	The ENQC% JSYS

;THE ENQC JSYS - ENQ CONTROL

;USED TO GET STATUS OF LOCKS AND GET AND SET QUOTA
;ACCEPTS IN T1/	FUNCTION CODE  -  0, 1, OR 2
;	    T2/	LOCATION OF ARGUMENT BLOCK
;	    T3/	ADDRESS OF STATUS BLOCK (FUNCTION 0 ONLY)
;	ENQC
;RETURNS +1:	ERROR - CODE IN T1
;	 +2:	SUCCESSFUL

;ARGUMENT BLOCK FOR FUNCTION 0 IS SAME AS FOR ENQ
;	FUNCTION 1 AND 2 ARGUMENT BLOCK IS:	QUOTA ,, JOB NUMBER

	SWAPCD			;[7.1040] 

.ENQC::	MCENT			;ENTER JSYS
	XCTU [HRRZ T1,1]	;GET FUNCTION CODE
	CAIN T1,.ENQCD		;DOING A DUMP?
	JRST ENQCD		;YES, GO DUMP
	JUMPN T1,ENQC1		;ALL EXCEPT FUNCTION 0 GO TO ENQC1
        CALL LOCKIT		;[7.1072] ()Obtain needed database locks
	CALL ENQCF0		;DO FUNCTION 0
	 JRST ENUNLE		;ERROR, GO UNLOCK AND RETURN THE CODE
	JRST DEQOKR		;SUCCESSFUL
	SUBTTL	The ENQC% JSYS -- ENQCF0 (Function 0)

;ENQC FUNCTION 0

;	XSWAPCD			;[7.1040] 

XNENT	(ENQCF0)		;[7.1040] ENQCF0: and XENQCF:
	JSP T1,SETVAR		;SET UP THE GLOBAL VARIABLES
	STKVAR <ENCF0L,ENCF0T,ENCF0S,ENCF0I,REMACL,REMCNT,REMJOB>  ;[7.1072]
	SETZM ENCF0L		;INITIALIZE LOCK BLOCK ADR
	SETZM ENCF0T		;INITIALIZE ERROR CODE REGISTER
	SETZM REMCNT		;[7.1072] Initialize the remote count
	SETOM REMJOB		;[7.1072] Initialize job number of remote owner
	SETZM REMACL		;[7.1072] Initialize remote access,,level
	UMOVE T1,3		;GET ADDRESS OF STATUS BLOCK
	MOVEM T1,EDSTB		;SAVE THE ADR OF THE STATUS BLOCK
	CALL VALARG		;VALIDATE THE ARGUMENT BLOCK
	 RET			;ERROR IN FORMAT
ENCF0A:	SETZM ENCF0S		;INITIALIZE TIME STAMP REGISTER
	SETZM ENCF0I		;..AND REQUEST ID REGISTER
	CALL VALREQ		;GET INFO ABOUT THE NEXT LOCK REQUEST
	 JRST ENCF0E		;ERROR ON THIS SPECIFICATION
	CALL HASH		;HASH IT
	 JRST ENCF0E		;ERROR
   IFN CLEQIN,<			;[7.1072] 
	MOVEM T1,REMACL		;[7.1072] Save hash index for a moment
   >				;[7.1072] 
	CALL FNDLOK		;FIND THE LOCK
	 JRST ENCF0F		;NOT DEFINED, IT MUST BE AVAILABLE
	MOVEM T1,ENCF0L		;REMEMBER THE LOCK ADDRESS
   IFN CLEQIN,<			;[7.1072] 
	MOVE T2,T1		;[7.1072] Reposition Lock-Block address
	MOVE T1,REMACL		;[7.1072] Get saved hash index
	CALL EQRSTS		;[7.1072] (T1,T2/T1,T3,T4)Get remote status
	MOVEM T1,REMACL		;[7.1072] Save access,,level
	HLRM T3,REMJOB		;[7.1072] Save the job number of remote owner
	HRRM T3,REMCNT		;[7.1072] Save number of remote sharers
	MOVEM T4,ENCF0S		;[7.1072] Save time stamp
	MOVE T1,ENCF0L		;[7.1072] Get Lock-Block address back
   >				;[7.1072] 
	CALL FNDQ		;FIND OUR REQUEST IF THERE IS ONE
	 TDZA T2,T2		;NOT IN Q, ZERO FLAG REGISTER
	MOVX T2,EN%QCQ		;WE ARE IN THE QUEUE
	JUMPE T2,ENCF0B		;IN THE QUEUE?
	LOAD T3,ENQID,(T1)	;YES, GET REQUEST ID OF US
	MOVEM T3,ENCF0I		;SAVE IT FOR LATER
ENCF0B:	HRR T2,REMJOB		;[7.1072] Get lock owner (-1 if unowned)
	SKIPGE REMACL		;[7.1072] Is this held exclusively remotely?
	TXO T2,EN%QCX		;[7.1072] Yes, set the exclusive bit now
	MOVE T1,ENCF0L		;GET ADDRESS OF LOCK AGAIN
	LOAD T3,ENQTS,(T1)	;GET TIME STAMP OF LOCK
	CAMLE T3,ENCF0S		;[7.1072] Greater than what is known remotely?
	MOVEM T3,ENCF0S		;SAVE IT
	LOAD T3,ENQLVL,(T1)	;GET LEVEL NUMBER
	DPB T3,[POINT LVLLEN,T2,17]
ENCF0G:	LOAD T1,ENQNLQ,(T1)	;SCAN THE LIST LOOKING FOR US
	LOAD T3,ENQFLG,(T1)	;GET FLAGS
	TRNE T3,EN.LB		;BACK TO THE LOCK BLOCK?
	JRST ENCF0D		;YES, NOT FOUND
	LOAD T4,ENQFRK,(T1)	;GET FORK NUMBER OF OWNER
	CAME T4,FORKX		;US?
	JRST ENCF0G		;NO, LOOP BACK THRU LIST
	TXNE T2,EN%QCQ		;Are we in the queue?
	 TXNN T3,EN.EXC		;Yes, exclusive access requested?
	  SKIPA			;No
	   TXO T2,EN%QCB	;Yes to both, we're in q for exclusive access
	TXNN T3,EN.LOK		;Have we got it locked?
	 JRST ENCF0G		;No, remember our q status, find locker
	JRST ENCF0H		;YES
ENCF0D:	MOVE T1,ENCF0L		;GET LOCK BLOCK ADR AGAIN
	LOAD T1,ENQNLQ,(T1)	;GET FIRST Q ON LIST
	LOAD T3,ENQFLG,(T1)	;GET FLAGS OF Q ENTRY
	TRNN T3,EN.LB		;IS THIS THE LOCK BLOCK?
	TRNE T3,EN.INV		;NO, IS THIS INVISIBLE?
	JRST ENCF0C		;YES, NOBODY OWNS LOCK
	LOAD T4,ENQFRK,(T1)	;GET FORK NUMBER OF THIS Q-BLOCK
	TRNN T3,EN.LOK		;[7.1072] Is it locked?
	JRST ENCF0C		;[7.1072] No, not locked on this system
	CAME T4,FORKX		;AND DOES THIS BELONG TO OUR FORK?
	SKIPA			;NO, DONT SET LOCKED BIT
ENCF0H:	TLO T2,(EN%QCO)		;YES, MARK THAT WE OWN IT
	TRNE T3,EN.EXC		;IS THIS AN EXCLUSIVE REQUEST?
	TLO T2,(EN%QCX)		;YES, SET THE EXCLUSIVE BIT
	SKIPGE REMACL		;[7.1072] Is this held exclusively remotely?
	IFSKP.			;[7.1072] No, so valid to use our block then
	  LOAD T3,ENQFRK,(T1)	;[7.1072] GET THE OWNER OF THIS Q-BLOCK
	  LOAD T3,FKJO%,(T3)	;[7.1072] GET JOB NUMBER
	  EXCH T1,T3		;[7.1072] LCL2GL expects job index in T1
	  CALLX (MSEC1,LCL2GL)	;[7.1072] [7.1040] Get Global Job Number from CFS
	   RET			;[7.1072] No such job/invalid job index
	  EXCH T1,T3		;[7.1072] Put things back where we expect them
	  HRR T2,T3		;[7.1072] PUT JOB NUMBER IN RIGHT HALF WORD
	ENDIF.			;[7.1072] 
	LOAD T3,ENQID,(T1)	;GET REQUEST ID
	SKIPN ENCF0I		;IF IT'S NOT ALREADY SET...
	MOVEM T3,ENCF0I		;..DO SO
ENCF0C:	MOVE T3,EDSTB		;GET ADR OF TEH STATUS BLOCK
	UMOVEM T2,0(T3)		;STORE  ANSWER IN STATUS BLOCK
	MOVE T2,ENCF0S		;GET TIME STAMP OF LOCK
	UMOVEM T2,1(T3)		;GIVE IT TO THE USER
	SKIPE T1,ENCF0L		;GET ADR OF LOCK BLOCK
	CALL CNTQ		;COUNT THE NUMBER OF SHARERS
	MOVE T3,EDSTB		;GET BACK THE ADR OF THE STATUS BLOCK
	MOVE T2,ENCF0I		;GET REQUEST ID
	ADD T1,REMCNT		;[7.1072] Add remote count to local count
	HRL T2,T1		;PUT THE COUNT OF SHARERS IN LH
	UMOVEM T2,2(T3)		;STORE IN STATUS BLOCK
	HRRI T3,3(T3)		;INCREMENT POINTER TO STATUS BLOCK
	MOVEM T3,EDSTB		;SAVE THE UPDATED ADR OF THE STATUS BLOCK
	ADD Q1,EDSTP		;STEP TO NEXT LOCK REQUEST
	JUMPG Q1,ENCF0A		;LOOP BACK IF ANY MORE LOCKS TO CHECK
	SKIPN T1,ENCF0T		;DID ANY ERRORS OCCUR DURING TESTING?
	RETSKP			;NO, GIVE OK RETURN
	RET			;YES, GIVE ERROR RETURN
ENCF0E:	HRLI T1,(EN%QCE)	;SET ERROR BIT IN LH OF WORD
	MOVE T2,T1		;SET UP TO STORE ERROR CODE IN LIST
	HRRZM T1,ENCF0T		;STORE ERROR CODE FOR ERROR RETURN
	JRST ENCF0C		;GO STORE CODE IN STATUS BLOCK

;[7.1072] Here if lock is not known on this system.

ENCF0F:
   IFN CLEQIN,<			;[7.1072]
	MOVE T1,REMACL		;[7.1072] Get saved hash index
	SETZ T2,		;[7.1072] No Lock-Block address
	CALL EQRSTS		;[7.1072] (T1,T2/T1,T3,T4)Get remote status
	SKIPGE T1		;[7.1072] Is this exclusive access?
	TXO T2,EN%QCX		;[7.1072] Yes, so indicate it
	DPB T1,[POINT LVLLEN,T2,17]  ;[7.1072] Store level number of lock
	HLR T2,T3		;[7.1072] Store job number of lock owner
	MOVEM T4,ENCF0S		;[7.1072] Store the time stamp
	HRRM T3,REMCNT		;[7.1072] Store the remote count
   >				;[7.1072] 
   IFE CLEQIN,<			;[7.1072] If no cluster ENQ code present
	MOVEI T2,-1		;MARK THAT THE LOCK IS FREE
   >				;[7.1072] 

	JRST ENCF0C		;GO STORE ANSWER IN STATUS BLOCK
	SUBTTL	The ENQC% JSYS -- ENQC1 (Functions 1 and 2)

;ENQC FUNCTIONS 1 AND 2

XNENT	(ENQC1)			;[7.1040] ENQC1: and XENQC1:
	UMOVE P1,2		;GET POINTER TO ARG BLOCK
	MOVE P2,T1		;SAVE FUNCTION CODE
	CAILE P2,ENQCMF		;LEGAL FUNCTION CODE?
	RETERR (ENQX1)		;NO, GIVE ERROR RETURN
	CAIN P2,.ENQCC		;SETTING QUOTA?
	JRST [	CALL CHKWHL	;YES, MUST BE A WHEEL
		JRST ENQGOK	;NOT PRIVILEGED ASK PERMISSION
		JRST .+1]
ENQOK:	XCTU [HRRZ T1,0(P1)]	;GET JOB NUMBER
	CAIN T1,-1		;-1 Means user wants self
	IFSKP.			;[7.1041] No - user specified global job number
	  CALLX (MSEC1,GL2LCL)	;[7.1041][7.1040] (T1/T1)Get the local index
	   RETERR(ENQX21)	;ILLEGAL JOB NUMBER
	ELSE.			;[7.1041] User supplied a -1 for job number
 	  MOVE T1,JOBNO		;GET OUR LOCAL JOB INDEX
	ENDIF.			;[7.1041]
	CALLX (MSEC1,MAPJSB)	;[7.1040] MAP IN THIS JSB
	 RETERR(ENQX21)		;JOB NOT LOGGED IN ERROR
	XCTU [HLRZ T2,0(P1)]	;GET NEW QUOTA
	CAIN P2,.ENQCC		;SETTING QUOTA?
	STOR T2,ENQOTA,(T1)	;YES, SET IT
	LOAD T3,ENQOTA,(T1)	;GET CURRENT QUOTA
	CAIN P2,.ENQCG		;USER WANTS QUOTA?
	UMOVEM T3,1		;YES, GIVE IT TO HIM
	CALLX (MSEC1,CLRJSB)	;[7.1040] UNMAP JSB AND ENABLE INTERRUPTS
	SMRETN			;GIVE OK RETURN

ENQGOK:	XCTU [HLRZ T2,0(P1)]	;GET QUOTA
	XCTU [HRRE T1,0(P1)]	;GET JOB NUMBER
	TOSWAPCD		;[7.1040] Go to section 1 for GETOK
	GTOKM (.GOENQ,<T2,T1>,[RETERR ()])
	TOXSWAPCD		;[7.1040] Back to extended section
	JRST ENQOK
	SUBTTL	The ENQC% JSYS -- ENQCD (Function 3)

;ENQC FUNCTION 3 - DUMP THE LOCKS AND QUEUES

	SWAPCD			;[7.1040]

ENQCD:	XCALL (XCDSEC,CHKENP)	;[7.8965] REQUIRES WHEEL, OPR OR ENQ PRIV
	 RETERR			;NOT PRIVILEGED!
	NOINT			;LOCK THE LOCKS
	LOKK ENQLKK		;[7.1072] Only want local database lock for dump
	MOVSI Q1,-HSHLEN	;SET UP COUNTER FOR MAIN LOOP
	MOVE Q3,[HSHTBL]	;GET ADDRESS OF HASH TABLE
	UMOVE P1,2		;GET POINTER TO DATA BLOCK
	XCTU [MOVN T1,0(P1)]	;GET NEGATIVE LENGTH
	HRL P1,T1		;SET UP AOBJP WORD
ENQCD1:	MOVE Q2,(Q3)		;GET POINTER TO LOCK BLOCK, IF ANY
ENQCD2:	CAMN Q2,Q3		;BACK TO HASH TABLE?
	JRST ENQCD3		;YES, GO STEP TO NEXT HASH ENTRY
	MOVE T1,Q2		;GET ADDRESS OF LOCK BLOCK
	CALL ENQDMP		;GO DUMP LOCK AND QUEUE BLOCKS
	 JRST ENQCD4		;ALL DONE
	LOAD Q2,ENQLHC,(Q2)	;[7.1088] Step to previous block on chain
	JRST ENQCD2		;LOOP BACK FOR ALL LOCKS

ENQCD3:	ADDI Q3,2		;STEP TO NEXT LOGICAL ENTRY
	AOBJN Q1,ENQCD1		;LOOP BACK FOR ALL HASH ENTRIES
	AOBJP P1,ENQCD4		;STEP THE USER'S DATA POINTER
	XCTU [SETOM 0(P1)]	;MARK THE END OF THE DUMP
ENQCD4:	UNLOKK ENQLKK		;UNLOCK THE ENQ DATA BASE
	OKINT
	SMRETN			;AND GIVE OK RETURN
	SUBTTL	The ENQC% JSYS -- ENQCD (Function 3) -- ENQDMP (Dump database)

;ROUTINE TO DUMP THE ENQ DATA BASE

;ACCEPTS IN T1/	ADDRESS OF A LOCK BLOCK
;	    P1/	ADDRESS IN USER SPACE OF BLOCK TO RECEIVE DATA
;	CALL ENQDMP
;RETURNS +1:	RAN OUT OF SPACE IN USER BUFFER
;	 +2:	OK RETURN

;	XSWAPCD			;[7.1040] 

XNENT	(ENQDMP)		;[7.1040] ENQDMP: and XENQDM:
        LOAD T2,ENQOFN,(T1)	;GET OFN OR -2, -3, OR 400000+JOB
	LOAD T3,ENQFLG,(T1)	;GET LOCK BLOCK FLAGS
	LOAD T4,ENQLVL,(T1)	;GET LEVEL NUMBER OF THIS LOCK
	HRL T2,T4		;SET UP ANSWER IN T2
	TLO T2,(EN%QCL)		;MARK THAT THIS IS A LOCK BLOCK
	TRNE T3,EN.TXT		;STRING POINTER?
	TLO T2,(EN%QCT)		;YES, MARK THAT IN ANSWER
   IFN CLEQIN,<			;[7.1072] 
	TRNE T3,EN.CLL		;[7.1072] Is this a cluster wide lock?
	TXO T2,EN%QCC		;[7.1072] Yes, mark it
	TRNE T3,EN.NOV		;[7.1072] Is voting required for lock?
	TXO T2,EN%QCN		;[7.1072] No, mark it
	TRNE T3,EN.SDO		;[7.1072] Does this lock need scheduling?
	TXO T2,EN%QCS		;[7.1072] Yes, mark it
   >				;[7.1072] 
	AOBJP P1,R		;ENOUGH ROOM LEFT?
	UMOVEM T2,0(P1)		;YES, STORE ANSWER IN DATA BLOCK
	LOAD T2,ENQTR,(T1)	;GET # IN POOL
	LOAD T4,ENQRR,(T1)	;GET # REMAINING
	HRL T4,T2		;SET UP ANSWER
	AOBJP P1,R		;IS THERE MORE ROOM?
	UMOVEM T4,0(P1)		;YES, STORE DATA IN BUFFER
	LOAD T2,ENQTS,(T1)	;GET TIME STAMP OF LOCK
	AOBJP P1,R		;UPDATE POINTER TO USER AREA
	UMOVEM T2,0(P1)		;GIVE TIME STAMP TO USER
	LOAD T2,ENQLEN,(T1)	;GET LENGTH OF BLOCK
	SUBI T2,LBLEN		;GET LENGTH OF DATA OR TEXT AREA
	MOVE T3,T1		;GET COPY OF LOCK BLOCK ADDRESS
ENQDM1:	LOAD T4,ENQTXT,(T3)	;GET NEXT WORD OF STRING
	AOBJP P1,R		;STEP TO NEXT WORD
	UMOVEM T4,0(P1)		;GIVE TEXT WORD TO USER
	AOS T3			;STEP TO NEXT WORD OF TEXT
	SOJG T2,ENQDM1		;ANY MORE TO GET?
	MOVE T2,T1		;NO, NOW GET Q-BLOCK INFO
ENQDM2:	LOAD T2,ENQNLQ,(T2)	;GET ADDRESS OF NEXT Q-BLOCK
	CAMN T2,T1		;BACK TO LOCK BLOCK?
	RETSKP			;YES, ALL FINISHED
	LOAD T3,ENQFRK,(T2)	;GET FORK NUMBER OF OWNER
	LOAD T3,FKJO%,(T3)	;GET JOB NUMBER OF CREATOR OF ENTRY
	EXCH T1,T3		;Put the local index where LCL2GL needs it
	CALLX (MSEC1,LCL2GL)	;[7.1040] Convert local to global job number
	 RET			;Bad data, can't do anything with it
	EXCH T1,T3		;Put things back where they belong
	LOAD T4,ENQCHN,(T2)	;GET PSI CHANNEL #
	HRL T3,T4		;SET UP ANSWER
	CAIN T4,.ENWCH		;THIS FORK WAITING?
	TLC T3,.ENWCH+<EN%QCB>_-^D18 ;YES, SET BLOCKED BIT
	LOAD T4,ENQFLG,(T2)	;GET FLAGS OF ENTRY
	TRNE T4,EN.LOK		;IS THIS LOCKED?
	TLO T3,(EN%QCO)		;YES, SET THE OWNER BIT
	TRNE T4,EN.LOK		;LOCKED?
	TLZ T3,(EN%QCB)		;YES, MAKE SURE BLOCKED BIT IS OFF
	TRNE T4,EN.EXC		;EXCLUSIVE LOCK
	TLO T3,(EN%QCX)		;YES
   IFN CLEQIN,<			;[7.1072] 
	TRNE T4,EN.CLL		;[7.1072] Is this a cluster wide request?
	TXO T3,EN%QCC		;[7.1072] Yes, mark it
   >				;[7.1072] 
	AOBJP P1,R		;ENOUGH ROOM?
	UMOVEM T3,0(P1)		;YES, GIVE IT TO USER
	LOAD T3,ENQID,(T2)	;GET ID NUMBER
	LOAD T4,ENQNR,(T2)	;GET NUMBER REQUESTED IF POOLED
	SKIPN T4		;IS THIS A NON-POOLED LOCK?
	LOAD T4,ENQGRP,(T2)	;YES, GET GROUP NUMBER INSTEAD
	HRL T3,T4		;CONSTRUCT ANSWER
	AOBJP P1,R		;STEP POINTER TO DATA BLOCK
	UMOVEM T3,0(P1)		;STORE IN USER BLOCK
	JRST ENQDM2		;LOOP BACK FOR OTHER Q ENTRIES
	SUBTTL	VALARG (Validate user argument block)

;ROUTINE TO VALIDATE THE ARGUMENT BLOCK FROM THE USER

;THIS ROUTINE LOADS Q1 - Q3 WITH THE FOLLOWING VALUES:
;	Q1/	# OF LOCKS-1 ,, ADDRESS OF FIRST LOCK REQUEST
;	Q2/	ID ,, PSI CHANNEL #
;	Q3/	MINIMUM MONITOR LEVEL ,, MINIMUM USER LOCK LEVEL
;	EDSTP/	-1 ,, LENGTH OF LOCK REQUEST BLOCK

VALARG:	UMOVE Q1,2		;GET LOCATION OF ARGUMENT BLOCK
	HRRZS Q1		;MUST CONTAIN USER SECTION WHEN SEC NON ZERO***
	UMOVE T1,.ENQLN(Q1)	;GET THE HEADER WORD OF THE ARG BLOCK
	HRRZ T4,T1		;GET LENGTH OF ARG BLOCK INTO T4
	LOAD T3,.ENNLK,T1	;GET NUMBER OF LOCKS INTO T3
	JUMPE T3,[RETBAD (ENQX9)] ;0 LOCKS IS NOT ALLOWED
	HRLI Q1,-1(T3)		;SAVE NUMBER OF LOCKS-1
	LOAD T2,.ENHLN,T1	;GET THE LENGTH OF HEADER AREA
	HRRZ T1,Q1		;GET ADDRESS OF USER ARG BLOCK
	CAIGE T2,.ENQHL		;IS IT AN OLD STYLE HEADER?
	MOVEI T2,.ENQHL		;YES, SET UP THE LENGTH MANUALLY
	ADD Q1,T2		;MAKE Q1 POINT TO START OF FIRST LOCK BLOCK
	SUBM T4,T2		;GET LENGTH OF LOCK AREA INTO T2
	IDIV T2,T3		;GET SIZE OF EACH LOCK BLOCK
	SKIPE T3		;MUST BE NO REMAINDER TO BE VALID
	RETBAD (ENQX10)		;ILLEGALLY FORMATTED ARGUMENT BLOCK
	HRROM T2,EDSTP		;SET UP THE STEP VARIABLE
	XCTU [MOVS Q2,.ENQID(T1)] ;GET ID ,, CHANNEL #
	HRRZ T1,Q2		;VALIDATE PSI CHANNEL NUMBER
	CAILE T1,^D35		;IS IT A LEGAL CHANNEL #
	RETBAD (ENQX11)		;NO, GIVE ERROR RETURN
	CALL GETLVL		;GET THE MINIMUM ALLOWABLE LEVEL
	MOVE Q3,T1		;SAVE IN Q3
	RETSKP			;GIVE OK RETURN
	SUBTTL	VALREQ (Validate a lock request)

;ROUTINE TO VALIDATE A LOCK REQUEST

;THIS ROUTINE ASSUMES Q1 - Q3 SET UP BY VALARG
;THIS ROUTINE SETS UP P1 - P3 WITH THE FOLLOWING INFORMATION:
;	P1/	FLAGS & LEVEL NUMBER ,, OFN
;	P2/	STRING POINTER OR 500000,,0 + USER CODE
;	P3/	# OF RESOURCES ,, # REQUESTED
;	P4 GETS SET UP WITH WORD LENGTH OF STRING BY HASH
;	P5/	JFN OF REQUEST ,, GROUP #
;	EDNMS/	NUMBER OF WORDS IN MASK BLOCK MINUS THE COUNT WORD
;	EDMSK/	ADR OF FIRST MASK WORD IN USERS MASK BLOCK

VALREQ:	HRRZ P3,Q1		;GET ADDRESS OF LOCK REQUEST
	SETZM EDMSK		;INITIALIZE GLOBAL VARIABLES
	SETZM EDNMS
	HRRZ T1,EDSTP		;GET SIZE OF LOCK REQUEST BLOCK
	CAIGE T1,4		;LONG ENOUGH TO CONTAIN A MASK BLOCK?
	JRST VALRQ2		;NO
	UMOVE T1,3(P3)		;YES, GET ADR OF MASK BLOCK
	JUMPE T1,VALRQ2		;IS THERE ONE?
	UMOVE T2,0(T1)		;YES, GET ITS LENGTH
	SUBI T2,1		;DONT COUNT THE COUNT WORD
	SKIPLE T2		;IS IT A LEGAL LENGTH
	CAILE T2,<^D512+^D35>/^D36
	RETBAD (ENQX22)		;ILLEGAL MASK BLOCK LENGTH
	MOVEM T1,EDMSK		;SAVE THE MASK BLOCK ADDRESS
	MOVEM T2,EDNMS		;NUMBER OF WORDS IN MASK BLOCK
	AOS EDMSK		;STEP MASK BLOCK ADR OVER COUNT WORD
VALRQ2:	UMOVE P3,2(P3)		;GET # OF RESOURCES
	HRR P5,P3		;GET GROUP NUMBER IN P5
	TLNN P3,-1		;IS THIS A POOLED REQUEST
	JRST [	SETZ P3,	;NO, ZERO P3
		JRST VALRQ0]
	HLLZS P5		;YES, MAKE GROUP # BE 0
	TRNN P3,-1		;YES, MUST REQUEST AT LEAST 1
	RETBAD (ENQX12)		;ERROR IF 0
	HLRZ T1,P3		;GET TOTAL # IN POOL
	CAIGE T1,0(P3)		;CAN THIS REQUEST BE MET?
	RETBAD (ENQX12)		;NO, GIVE ERROR RETURN
VALRQ0:	HRRZ P2,Q1		;GET ADDRESS OF LOCK REQUEST
	UMOVE P2,1(P2)		;GET STRING POINTER TO RESOURCE ID
	TLC P2,-1		;SEE IF -1 IN LH
	TLCN P2,-1		;...
	HRLI P2,(POINT 7,0)	;YES, SET UP ASCII POINTER
	LDB T2,[POINT 3,P2,2]	;GET HIGH ORDER 3 BITS
	CAIN T2,5		;IS THIS A USER CODE?
	JRST VALRQ1		;YES
	TLZE P2,37		;NO, INDIRECT OR INDEXED POINTER?
	RETBAD (ENQX13)		;YES, THIS IS NOT ALLOWED
	MOVE T1,P2		;GET THE POINTER FOR A CALL
	CALLX (MSEC1,PTRCHK)	;[7.1040] SEE IF THIS IS AN ILLEGAL OWGBP
	 RETBAD(ENQX14)		;YES...INVALID BYTE SIZE ERROR
VALRQ1:	HRRZ P1,Q1		;GET ADDRESS ONLY
	UMOVE P1,0(P1)		;GET FLAGS, LEVEL #, AND JFN
	HRL P5,P1		;SAVE JFN OF REQUEST
	HRRZ T1,P1		;GET JFN AGAIN
	CAIN T1,-1		;JOB WIDE LOCK?
	JRST [	HRR P1,GBLJNO	;YES, GET GLOBAL JOB NUMBER
		TRO P1,400000	;MAKE IT 400000 + JOB NUMBER
		RETSKP]		;ALL THROUGH
	CAIN T1,-2		;GLOBAL LOCK?
	CALLRET CHKENP		;[7.1072] YES, CHECK IF PRIVILEGED
	CAIN T1,-3		;SYSTEM LOCK?
	CALLRET CHKWHL		;[7.1072] YES, CHECK WHEEL PRIVILEGE
	CALL CHKENJ		;CHECK IF THIS IS A LEGAL JFN
	 RET			;NO, GIVE ERROR RETURN
	HRR P1,T1		;SAVE OFN
	RETSKP			;GIVE OK RETURN
	SUBTTL	CHKENP (Check for ENQ privs)

;ROUTINE TO CHECK IF ENQ PRIVILEGE IS SET

;	CALL CHKENP
;RETURNS +1:	PRIVILEGE NOT SET - ERROR CODE IN T1
;	 +2:	PRIVELEGE SET

CHKENP:	MOVE T1,CAPENB		;GET ENABLED PRIVILEGES
	TRNN T1,SC%WHL!SC%OPR!SC%ENQ
	RETBAD (ENQX15)		;NOT PRIVILEGED
	RETSKP			;HAS ENOUGH PRIVILEGES
	SUBTTL	CHKWHL (Check for WHEEL/OPERATOR privs)

;ROUTINE TO CHECK IF THE USER IS A WHEEL OR OPERATOR

CHKWHL:	MOVE T1,CAPENB		;GET CAPABILITIES
	TRNN T1,SC%WHL!SC%OPR	;WHEEL OR OPERATOR
	RETBAD (ENQX16)		;NO
	RETSKP			;YES
	SUBTTL	CHKJFN (Check for legal JFN)

;ROUTINE TO CHECK A JFN FOR LEGALITY AND GET THE OFN

;ACCEPTS IN T1/	JFN
;	CALL CHKENJ
;RETURNS +1:	NOT A LEGAL JFN FOR LOCKING ON
;	 +2:	JFN LEGAL - OFN IN T1

CHKENJ:	HRLZS T1		;LH = JFN ,, RH = PAGE # 0
	CALLX (MSEC1,JFNOFN)	;[7.1040] GET OFN,,PAGE # FOR PAGE 0 OF THIS JFN
	 JRST [	SKIPGE T1	;SEE IF THERE IS AN ERROR CODE IN T1
		MOVEI T1,ENQX17	;NO, ILLEGAL JFN
		RET]		;GIVE ERROR RETURN
	HLRZS T1		;GET OFN IN RH
	RETSKP			;GIVE OK RETURN
	SUBTTL	FNDLOK (Find a Lock-Block)

;ROUTINE TO FIND A LOCK-BLOCK

;ACCEPTS IN T1/	HASH INDEX
;	P1-P4/	AS SET UP BY VALREQ
;	CALL FNDLOK
;RETURNS +1:	NOT FOUND
;	 +2:	LOCK-BLOCK FOUND, ADDRESS IN T1

FNDLOK:	STKVAR <FNDLKI,FNDLKO,FNDLKP,FNDLKL>
	ADD T1,[HSHTBL]		;ADD HASH-TABLE ADDRESS
	MOVEM T1,FNDLKI		;SAVE THE HASH CHAIN ADDRESS
FNDLK1:	LOAD T1,ENQNHC,(T1)	;GET NEXT LOCK-BLOCK ON CHAIN
	CAMN T1,FNDLKI		;HAVE WE EXHAUSTED LIST?
	RETBAD (ENQX7)		;YES, LOCK BLOCK WAS NOT FOUND
	MOVEM T1,FNDLKL		;REMEMBER THIS LOCK-BLOCK ADDRESS
	LOAD T2,ENQOFN,(T1)	;GET OFN NUMBER
	CAIE T2,(P1)		;IS THIS A MATCH?
	JRST FNDLK2		;NO, TRY NEXT ENTRY
	MOVE T2,P2		;GET STRING POINTER
	CALL STRCMP		;COMPARE STRINGS
	 JRST FNDLK2		;NO MATCH
	MOVE T1,FNDLKL		;GET BACK LOCK-BLOCK ADDRESS
	RETSKP			;LOCK-BLOCK WAS FOUND

FNDLK2:	MOVE T1,FNDLKL		;GET LOCK-BLOCK ADDRESS
	JRST FNDLK1		;LOOP BACK TILL LIST SCANNED
	SUBTTL	FNDQ (Find a Q-Block)

;ROUTINE TO FIND A Q-BLOCK

;ACCEPTS IN T1/	LOCK-BLOCK ADDRESS
;	CALL FNDQ
;RETURNS +1:	NO Q-BLOCK UNDER THIS LOCK
;	 +2:	Q-BLOCK FOUND, Q-BLOCK ADDRESS IN T1

FNDQ:	LOAD T2,ENQNLQ,(T1)	;GET ADDRESS OF FIRST Q-BLOCK
	EXCH T1,T2		;GET Q-BLOCK ADR INTO T1 FOR RETURN
FNDQ1:	CAMN T2,T1		;HAVE WE ARRIVED BACK AT LOCK-BLOCK?
	RETBAD (ENQX7)		;YES, GIVE UNSUCCESSFUL RETURN
	LOAD T3,ENQGRP,(T1)	;GET GROUP # OF BLOCK
	CAIE T3,0(P5)		;MATCH?
	JRST FNDQ2		;NO, KEEP LOOKING
	LOAD T3,ENQFRK,(T1)	;GET OWNER OF BLOCK
	CAME T3,FORKX		;IS THIS OUR Q-BLOCK?
	JRST FNDQ2		;NO, KEEP LOOKING
	LOAD T3,ENQJFN,(T1)	;GET JFN FROM Q-BLOCK
	HLRZ T4,P5		;AND JFN FOR NEW REQUEST
	CAMN T4,T3		;DO THE JFNS MATCH?
	RETSKP			;YES, RETURN WITH ADR IN T1
FNDQ2:	LOAD T1,ENQNLQ,(T1)	;STEP TO NEXT Q-BLOCK
	JRST FNDQ1		;LOOP BACK FOR ALL Q-BLOCKS
	SUBTTL	GETLVL (Get highest locked level)

;ROUTINE TO GET THE HIGHEST LOCKED LEVEL #

;	CALL GETLVL
;RETURNS +1:	ALWAYS
;		T1/	LH = MONITOR LEVEL #, RH = USER LEVEL #

GETLVL:	STKVAR <GETLVU,GETLVM>
	SETOM GETLVU		;INITIALIZE USER LEVEL TO -1
	SETOM GETLVM		;SAME FOR MONITOR LEVEL #
	MOVEI T1,ENQLST		;GET FIRST Q-BLOCK OF JOB
	LOAD T1,ENQNJQ,(T1)	;...
GETLV1:	JUMPE T1,GETLV3		;IF 0, END OF JOB LIST
	LOAD T2,ENQFRK,(T1)	;GET FORK # OF OWNER
	CAME T2,FORKX		;IS THIS OUR FORK?
	JRST GETLV2		;NO, IGNORE IT
	LOAD T2,ENQLBP,(T1)	;GET ADDRESS OF LOCK BLOCK
	LOAD T3,ENQLVL,(T2)	;GET LEVEL NUMBER OF THIS LOCK
	LOAD T4,ENQOFN,(T2)	;GET OFN OF LOCK
	CAIN T4,-3		;IS THIS A MONITOR LOCK?
	JRST [	CAMLE T3,GETLVM	;YES, IS THIS A NEW HIGH MONITOR LEVEL?
		MOVEM T3,GETLVM	;YES, STORE THIS NEW LEVEL NUMBER
		JRST GETLV2]	;GO CHECK OTHER LEVELS
	CAMLE T3,GETLVU		;NO, IS THIS A NEW HIGH USER LEVEL?
	MOVEM T3,GETLVU		;YES, REMEMBER IT
GETLV2:	LOAD T1,ENQNJQ,(T1)	;STEP TO NEXT ENTRY IN JOB LIST
	JRST GETLV1		;LOOP BACK FOR ALL Q-BLOCKS

GETLV3:	HRL T1,GETLVM		;SET UP ANSWER
	HRR T1,GETLVU		;...
	RET			;AND RETURN
	SUBTTL	CNTQ/CNTQLQ (Get share counts)

;ROUTINE TO COUNT UP THE NUMBER OF SHARERS OF A LOCK
;ACCEPTS IN T1/	LOCK BLOCK ADDRESS
;	CALL CNTQ
;Returns +1:	Always, with:
;[7.1072]	T1/ access!fork number of latest sharer,,count of sharers
;[7.1072]
;[7.1072]	The access is held in bit 0 and is 1 for shared and 0 for
;[7.1072]	exclusive.  The fork number is in bits 1 - 17 and the count
;[7.1072]	of sharers (lockers) is in bits 18 - 35.  If the lock is not
;[7.1072]	owned, then both the fork number and share count will be 0.
;[7.1072] 
;[7.1072]  Routine CNTQLQ is an alternate entry point which returns
;[7.1072]  Count of waiters,,Count of lockers in T1.

CNTQLQ::STKVAR <EFLG>		;[7.1072] Entry flag
	SETOM EFLG		;[7.1072] Indicate entered CNTQLQ
	SETZ T4,		;[7.1072] Initialize count
	JRST CNTQ1		;[7.1072] Continue at common code

CNTQ::	STKVAR <EFLG>		;[7.1072] Entry flag
	SETZM EFLG		;[7.1072] Indicate entered CNTQ
      	HRLZI T4,(1B0)		;[7.1072] Initialize access!fork-number,,count
CNTQ1:	MOVE T2,T1		;SAVE ADR OF LOCK BLOCK
CNTQL:	LOAD T2,ENQNLQ,(T2)	;STEP TO THE NEXT QUEUE BLOCK
	CAMN T2,T1		;BACK TO THE LOCK BLOCK YET?
	JRST [	MOVE T1,T4	;YES, GET THE COUNT INTO T1
		RET]		;AND RETURN
	LOAD T3,ENQFLG,(T2)	;GET THE FLAGS OF THIS BLOCK
	TXNN T3,EN.LOK		;[7.1072] Is the lock locked?
	IFSKP.			;[7.1072] Yes
	  AOS T4		;[7.1072] Increment number of lockers (sharers)
	  LOAD T3,ENQFRK,(T2)	;[7.1072] Get the fork number of this sharer
	  DPB T3,[POINT 9,T4,17];[7.1072] Save it
	  LOAD T3,ENQFLG,(T2)	;[7.1072] Get the flags
	  TXNE T3,EN.EXC	;[7.1072] Is this an exclusive lock?
	  TLZ T4,(1B0)		;[7.1072] Yes, clear bit 0
	ELSE.			;[7.1072] Not locked
	  SKIPE EFLG		;[7.1072] Was CNTQLQ called?
	  ADD T4,[1,,0]		;[7.1072] Increment number of waiters
	ENDIF.			;[7.1072] 
	JRST CNTQL		;LOOP BACK TILL BACK TO LOCK BLOCK

	ENDSV.			;[7.1072] 
	SUBTTL	STRCMP/STVCMP (Compare strings or user codes)

;ROUTINE TO COMPARE STRINGS OR USER CODES

;ACCEPTS IN T1/	LOCK BLOCK ADDRESS
;	    T2/	STRING POINTER  OR  USER CODE
;	CALL STRCMP
;RETURNS +1:	NO MATCH
;	 +2:	MATCH
;
;[7.1072] STVCMP is an alternate entry point used by LOCLOK in ENQSRV.
;[7.1072] The only difference is that the string pointer points to a string
;[7.1072] in the VRQA and not in user address space.

   IFN CLEQIN,<			;[7.1072] If cluster ENQ code present
STVCMP::STKVAR <STRCPP,STRENT>	;[7.1072] 
	SETOM STRENT		;[7.1072] Indicate entry to STVCMP
	JRST STRCM1		;[7.1072] Continue at common code
   >				;[7.1072] 

STRCMP:	STKVAR <STRCPP,STRENT>	;[7.1072]
	SETZM STRENT		;[7.1072] Indicate entry to STRCMP
STRCM1:	LOAD T3,ENQFLG,(T1)	;[7.1072] GET FLAGS OF LOCK-BLOCK
	TRNN T3,EN.TXT		;TEXT OR USER CODE?
	JRST STRCMC		;USER CODE
	LOAD T3,NMFLG,T2	;GET BITS 0-2 TO SEE IF USER SPECIFIED CODE
	CAIN T3,NUMVAL		; 5B2 CANNOT BE A STRING POINTER
	RET			; SO RETURN NO MATCH ON TYPE MISMATCH

	MOVE T3,T2		;BUILD THE STRING POINTER
	AND T3,[007700,,0]	;GET THE BYTE SIZE OF THE OTHER STRING
	TDO T3,[POINT 0,.ENTXT(T1)] ;SET UP THE REST OF THE BYTE POINTER
	MOVEM T3,STRCPP		;SAVE BYTE POINTER INTO LOCK-BLOCK
STRCM0:	SKIPE STRENT		;[7.1072] Was STRCMP called?
	IFSKP.			;[7.1072] Yes
	  XCTBU [ILDB T3,T2]	;[7.1072] Get user's byte from user space
	ELSE.			;[7.1072] No, STVCMP was called
	  ILDB T3,T2		;[7.1072] Get byte from VRQA
	ENDIF.			;[7.1072] 
	ILDB T4,STRCPP		;GET LOCK'S BYTE
	CAME T3,T4		;A MATCH?
	RET			;NO, RETURN
	JUMPN T3,STRCM0		;IF NOT 0, LOOP BACK
	RETSKP			;STRING MATCHED

STRCMC:	LOAD T3,ENQTXT,(T1)	;GET USER CODE
	CAME T2,T3		;IS THIS A MATCH?
	RET			;NO
	RETSKP			;YES

	ENDSV.			;[7.1072] 
	SUBTTL	CRELOK (Create a Lock-Block)

;ROUTINE TO CREATE A LOCK-BLOCK

;ACCEPTS IN T1/	HASH INDEX
;	P1-P4/	AS SET UP BY VALREQ
;	CALL CRELOK
;RETURNS +1:	COULD NOT CREATE LOCK-BLOCK
;	 +2:	SUCCESSFUL - LOCK-BLOCK ADDRESS IN T1

CRELOK:	STKVAR <CRELKH,CRELKL>
	MOVEM T1,CRELKH		;SAVE THE HASH INDEX
;   IFN CFSCOD,<			;If CFS stuff
	CALL CFETST		;(P1) IS IT AN OWNED CFS RESOURCE?
	 RETBAD ()		;YES
;   >	;IFN CFSCOD
	SKIPN T1,P4		;STRING OR CODE?
	MOVEI T1,1		;USER CODE NEEDS ONLY ONE WORD
	ADDI T1,LBLEN		;ADD IN LOCK-BLOCK LENGTH
	MOVEM T1,CRELKL		;REMEMBER THE LOCK-BLOCK LENGTH
	CALL ASGEQ		;GET FREE BLOCK FOR LOCK
;   IFN CFSCOD,<			;If CFS stuff
	IFNSK.			;If failed
	 PUSH P,T1		;Save error code
	 HRRE T1,P1		;Get the OFN
	 SKIPLE T1		;Is this a CFS lock?
	 CALLX (MSEC1,CFSDEQ)	;[7.1040] yep. Undo the lock
	 CALLRET PA1		;Done
	ENDIF.
;   >	;IFN CFSCOD
   REPEAT 0,<			;CFSCOD NO LONGER USED
   IFE CFSCOD,< RETBAD()>
   >				;END REPEAT 0
 	MOVE T2,CRELKH		;PUT BLOCK ON HASH LIST
   IFN CLEQIN,<			;[7.1072]
	STOR T2,ENQHSH,(T1)	;[7.1072] Save hash value in Lock-Block
   >				;[7.1072] 
	ADD T2,[HSHTBL]		;TURN INDEX INTO HASH TABLE OFFSET
	STOR T2,ENQLHC,(T1)	;POINT BACK TO HASH TABLE ENTRY
	LOAD T3,ENQNHC,(T2)	;GET HASH TABLE FORWARD POINTER
	STOR T1,ENQNHC,(T2)	;MAKE THIS LOCK-BLOCK FIRST ON LIST
	STOR T3,ENQNHC,(T1)	;MAKE NEW LOCK POINT TO NEXT LOCK
	STOR T1,ENQLHC,(T3)	;MAKE SECOND ENTRY POINT BACK TO US
	STOR T1,ENQLLQ,(T1)	;THIS IS AN EMPTY LOCK
	STOR T1,ENQNLQ,(T1)	;IT POINTS TO ITSELF
	LDB T2,[POINT 9,P1,17]	;GET THE LEVEL NUMBER
	STOR T2,ENQLVL,(T1)	;REMEMBER THE LEVEL # OF THIS LOCK
	HLRZ T2,P3		;GET # OF RESOURCES
	STOR T2,ENQRR,(T1)	;SET UP REMAINING RESOURCES
	STOR T2,ENQTR,(T1)	;AND TOTAL RESOURCES
	STOR P1,ENQOFN,(T1)	;SAVE OFN CODE
	MOVE T2,CRELKL		;GET LOCK-BLOCK LENGTH
	STOR T2,ENQLEN,(T1)	;SAVE LENGTH FOR RETURNING LOCK-BLOCK
	MOVEI T3,-1		;MARK THAT THIS LOCK IS NOT ON LTL LIST
	STOR T3,ENQLT,(T1)	;THIS CAUSES IT TO BE PUT ON LIST LATER
   IFN CLEQIN,<			;[7.1072] 
	STOR T3,ENQAFP,(T1)	;[7.1072] This block is going on end of action list
	MOVE T2,EQLBLT		;[7.1072] Get the head of the action list
	CAIE T2,-1		;[7.1072] Is the action list empty?
	IFSKP.			;[7.1072] Yes, so set up first entry specially
	  STOR T1,ENQABP,(T1)	;[7.1072] The last block is us, forward pointer stays -1
	  MOVEM T1,EQLBLT	;[7.1072] The first block on the list is us, too
	ELSE.			;[7.1072] Not empty - add to end of action list
	  LOAD T3,ENQABP,(T2)	;[7.1072] Get last block on action list
	  STOR T1,ENQAFP,(T3)	;[7.1072] Make last block's FLINK point to new block
	  STOR T3,ENQABP,(T1)	;[7.1072] New BLINK point to last - FLINK stays -1
	  STOR T1,ENQABP,(T2)	;[7.1072] First block's BLINK points to new block
	ENDIF.			;[7.1072] 
	AOS EQLBCT		;[7.1115] Count one more block on the list
   >				;[7.1072] 
	MOVEI T2,EN.LB		;GET FLAGS
   IFN CLEQIN,<			;[7.1072] 
	HRRE T3,P1		;[7.1072] Get lock type and extend sign
	IFL. T3			;[7.1179] Is this a non-file lock?
	  TRNN T3,77000		;[7.1179] Yes. Is this a -1 type of lock?
	  TXO T2,EN.NOV		;[7.1072] Yes, so no vote is ever required
	ENDIF.			;[7.1072] 
   >				;[7.1072]
	LDB T3,[POINT 3,P2,2]	;GET HIGH ORDER 3 BITS
	CAIE T3,5		;A USER CODE?
	TRO T2,EN.TXT		;NO, SET TEXT FLAG
   IFN CLEQIN,<			;[7.1072] 
	SKIPE ELBCSH		;[7.1072] Is Lock-Block caching enabled?
	TXO T2,EN.LTL		;[7.1072] Yes, so set LTL always
   >				;[7.1072] 
	TXNE P1,EN%LTL		;LONG TERM LOCK?
	TXO T2,EN.LTL		;YES, REMEMBER THIS IN THE LOCK BLOCK
	STOR T2,ENQFLG,(T1)	;STORE FLAGS OF LOCK-BLOCK
	TRNN T2,EN.TXT		;TEXT?
	JRST [	STOR P2,ENQTXT,(T1) ;NO, STORE USER CODE
		RETSKP]		;ALL DONE
	MOVE T2,P2		;BUILD THE BYTE POINTER
	AND T2,[007700,,0]	;GET BYTE SIZE FROM OTHE BYTE POINTER
	TDO T2,[POINT 0,.ENTXT(T1)]
CRELK1:	XCTBU [ILDB T3,P2]	;COPY USER STRING INTO MONITOR BLOCK
	IDPB T3,T2		;...
	JUMPN T3,CRELK1		;IF NOT 0, LOOP BACK FOR ALL CHARS
	RETSKP			;LOCK-BLOCK CREATED
	SUBTTL	CREQ (Create a Q-Block and link to Lock-Block)

;ROUTINE TO CREATE A Q-BLOCK AND PUT IT ON A LOCK-BLOCK CHAIN

;ACCEPTS IN T1/	LOCK-BLOCK ADR
;	    T2/	Q-BLOCK ADR OF MEMBER OF MULTIPLE REQUEST
;	    T3/	FLAGS FOR NEW Q-BLOCK
;	Q1-Q3, P1-P4 AS SET UP BY VALARG AND VALREQ
;	CALL CREQ
;RETURNS +1:	CANNOT CREATE Q-BLOCK
;	 +2:	Q-BLOCK ADDRESS IN T1

CREQ:	STKVAR <CREQL,CREQQ,CREQF,CREQA>
	MOVEM T1,CREQL		;SAVE LOCK-BLOCK ADDRESS
	MOVEM T2,CREQQ		;SAVE MULTIPLE REQUEST Q-BLOCK
	MOVEM T3,CREQF		;SAVE FLAGS
	LOAD T1,ENQOTA		;GET QUOTA FOR THIS JOB
	LOAD T2,ENQCNT		;GET CURRENT COUNT
	HRRZ T3,P1		;GET OFN
	CAIN T3,-3		;SYSTEM LOCK?
	JRST CREQ1		;YES, DONT COUNT UP QUOTA
	CAMG T1,T2		;ROOM LEFT FOR MORE ENTRIES?
	RETBAD (ENQX18)		;NO, DONT CREATE QUEUE
	AOS T2			;COUNT UP COUNT
	STOR T2,ENQCNT		;STORE UPDATED COUNT
CREQ1:	MOVE T2,CREQL		;GET ADR OF THE LOCK BLOCK
	LOAD T1,ENQFBP,(T2)	;SEE IF THERE IS A FREE Q-BLOCK
	SETZRO ENQFBP,(T2)	;CLEAR OUT POINTER TO THE BLOCK
	JUMPN T1,CREQ2		;IF THERE IS A FREE BLOCK, GO USE IT
	MOVEI T1,QBLEN		;GET LENGTH OF Q-BLOCK
	CALL ASGEQ		;GET FREE BLOCK FOR Q
	 RET			;NO SPACE LEFT
CREQ2:	MOVEM T1,CREQA		;SAVE THE ADDRESS OF THE Q-BLOCK
	MOVEI T2,ENQLST		;GET ADDRESS OF Q-LIST HEADER FOR JOB
	STOR T2,ENQLJQ,(T1)	;POINT THIS Q-BLOCK BACK TO HEADER
	LOAD T3,ENQNJQ,(T2)	;GET FORWARD POINTER FROM Q-LIST HEADER
	STOR T1,ENQNJQ,(T2)	;MAKE Q-LIST HEADER POINT TO THIS Q-BLOCK
	STOR T3,ENQNJQ,(T1)	;MAKE US POINT FORWARD
	SKIPE T3		;IS THIS THE END OF THE LIST
	STOR T1,ENQLJQ,(T3)	;NO, MAKE SECOND ITEM POINT BACK TO US
	MOVE T2,CREQL		;GET LOCK BLOCK ADDRESS AGAIN
	STOR T2,ENQNLQ,(T1)	;MAKE US POINT FORWARD TO LOCK-BLOCK
	LOAD T3,ENQLLQ,(T2)	;GET BACK OF QUEUE FROM LOCK-BLOCK
	STOR T3,ENQLLQ,(T1)	;MAKE US POINT BACK TO IT
	STOR T1,ENQNLQ,(T3)	;MAKE IT POINT TO US
	STOR T1,ENQLLQ,(T2)	;MAKE LOCK-BLOCK POINT BACK TO US
	STOR T2,ENQLBP,(T1)	;SET UP A POINTER TO THE LOCK-BLOCK
	STOR Q2,ENQCHN,(T1)	;SAVE PSI CHANNEL NUMBER
	HLRZ T2,Q2		;GET ID
	STOR T2,ENQID,(T1)	;SAVE THE ID NUMBER
	MOVE T2,CREQF		;GET FLAGS
	STOR T2,ENQFLG,(T1)	;SAVE THEM
	MOVE T2,FORKX		;GET FORK NUMBER OF THIS FORK
	STOR T2,ENQFRK,(T1)	;SAVE IT FOR INTERRUPTING
	STOR P3,ENQNR,(T1)	;STORE # OF RESOURCES REQUESTED
	HLRZ T2,P5		;GET JFN OF REQUEST
	STOR T2,ENQJFN,(T1)	;STORE JFN
	HRRZ T2,P5		;GET GROUP #
	STOR T2,ENQGRP,(T1)	;STORE GROUP NUMBER
	LOAD T1,ENQMSK,(T1)	;DO WE HAVE A MASK BLOCK YET?
	JUMPE T1,CREQ3		;...
	MOVE T2,CREQL		;YES, GET ITS SIZE
	LOAD T2,ENQNMS,(T2)	;  FROM THE LOCK BLOCK
	CAMN T2,EDNMS		;IS THIS THE SAME SIZE AS REQUESTED
	JRST CREQ3A		;YES, GO USE IT
	CALL RELEQ		;NO, RELEASE IT
	MOVE T1,CREQA		;GET THE ADR OF THE Q-BLOCK AGAIN
	SETZRO ENQMSK,(T1)	;CLEAR THE MASK BLOCK ADDRESS
CREQ3:	SKIPN T1,EDNMS		;IS THERE A MASK BLOCK SPECIFIED?
	JRST CREQ5		;NO
	CALL ASGEQ		;YES, GET SPACE FOR IT
	 RETBAD (,<MOVE T1,CREQA ;FAILED, RETURN Q-BLOCK
		MOVEI T2,QBLEN
		CALL RELEQ
		MOVE T1,LSTERR>) ;GET BACK ERROR CODE
CREQ3A:	MOVE T2,CREQA		;GET ADR OF Q-BLOCK
	STOR T1,ENQMSK,(T2)	;SAVE ADR OF MASK BLOCK IN Q-BLOCK
	MOVE T4,EDNMS		;GET THE LENGTH OF THE BLOCK
	MOVE T3,CREQL		;GET ADR OF LOCK BLOCK
	STOR T4,ENQNMS,(T3)	;STORE THE LENGTH OF THE MASK BLOCK
	MOVE T3,EDMSK		;GET THE ADR OF THE USER'S MASK BLOCK
CREQ4:	UMOVE T2,0(T3)		;GET THE NEXT USER MASK WORD
	MOVEM T2,0(T1)		;COPY IT TO THE MASK BLOCK
	AOS T1			;STEP THE USER'S ADR
	AOS T3			;STEP THE MONITOR'S ADR
	SOJG T4,CREQ4		;LOOP BACK TILL THE BLOCK IS COPIED
CREQ5:
   IFN CLEQIN,<			;[7.1179] 
	MOVE T1,CREQL		;[7.1179] Get address of Lock-Block
	LOAD T2,ENQFLG,(T1)	;[7.1179] Get flags from Lock-Block
	MOVE T3,CREQF		;[7.1179] Get flags stored in Q-Block
	TXNE T3,EN.CLL		;[7.1179] Is this a cluster-wide request?
	TXO T2,EN.CLL		;[7.1179] Yes, so this is cluster-wide lock
	STOR T2,ENQFLG,(T1)	;[7.1179] Put flags into Lock-Block
   >				;[7.1179]
	MOVE T1,CREQA		;GET BACK THE ADR OF THE Q-BLOCK
	SKIPN T2,CREQQ		;IS THIS A MULTIPLE REQUEST?
	JRST [	STOR T1,ENQFQ,(T1) ;NO, MAKE AN EMPTY LIST
		STOR T1,ENQLRQ,(T1)
		RETSKP]		;ALL DONE
	LOAD T3,ENQFQ,(T2)	;ADD THIS Q-BLOCK ONTO LIST OF REQUESTS
	STOR T1,ENQFQ,(T2)	;  POINT FORWARD TO US
	STOR T1,ENQLRQ,(T3)	;  POINT BACK TO US
	STOR T3,ENQFQ,(T1)	;  WE POINT FORWARD
	STOR T2,ENQLRQ,(T1)	;  AND WE POINT BACKWARD
	RETSKP			;ALL THROUGH
	SUBTTL	REQDEQ (DEQ an entire request)

;ROUTINE TO DEQ AN ENTIRE REQUEST

;ACCEPTS IN T1/	Q-BLOCK ADDRESS
;	CALL REQDEQ
;RETURNS +1:	ALWAYS, REQUEST DEQUEUED

REQDEQ:	CALL QDEQ		;DEQUEUE THIS Q-BLOCK
	JUMPN T1,REQDEQ		;IF ANY MORE Q-BLOCKS, DEQ THEM TOO
	RET			;EXIT SUCCESSFULLY
	SUBTTL	SQDEQ (DEQ a single Q-Block)

;ROUTINE TO DEQ A SINGLE Q-BLOCK

;ACCEPTS IN T1/	Q-BLOCK ADDRESS TO BE DEQUEUED
;	CALL SQDEQ
;RETURNS +1:	ALWAYS - Q-BLOCK DEQUEUED AND SCHEDULING PERFORMED

SQDEQ:	STKVAR <SQDEQQ,SQDEQF>
	LOAD T2,ENQFLG,(T1)	;GET FLAGS OF THIS Q-BLOCK
	MOVEM T2,SQDEQF		;SAVE FOR LATER USE
	CALL QDEQ		;DEQ THIS Q-BLOCK
	JUMPE T1,R		;IF NOT A MULTIPLE REQUEST, RETURN
	MOVEM T1,SQDEQQ		;SAVE Q-BLOCK ADDRESS
	CALL QSKD		;SCHEDULE THIS Q ENTRY
	 RET			;LOCK NOT LOCKED YET
	JUMPN T1,SQDEQ1		;LOCKING WAS COMPLETED ON THIS CALL?
	MOVE T1,SQDEQF		;NO, SEE IF USER NEEDS WAKING UP
	TRNE T1,EN.LOK		;WAS THE ORGINAL Q ALREADY LOCKED?
	RET			;YES, THEN USER HAD BEEN INFORMED
SQDEQ1:	MOVE T1,SQDEQQ		;USER NEEDS AWAKENING, GET Q ADDRESS
	CALLRET INTQ		;GO WAKE UP THE FORK
	SUBTTL	QDEQ (DEQ a Q-Block)

;ROUTINE TO DEQ A Q-BLOCK

;ACCEPTS IN T1/	Q-BLOCK ADDRESS
;	CALL QDEQ
;RETURNS +1:	ALWAYS - T1 CONTAINS 0 OR Q-BLOCK ADR OF NEXT Q IN THE
;				MULTIPLE REQUEST CHAIN

QDEQ:	STKVAR <QDEQRQ,QDEQLB,QDEQQA>
	MOVEM T1,QDEQQA		;SAVE THE ADR OF THE Q-BLOCK
	LOAD T2,ENQLJQ,(T1)	;REMOVE Q-BLOCK FROM JOB CHAIN
	LOAD T3,ENQNJQ,(T1)	;GET POINTERS BACKWARD AND FORWARD
	SKIPE T3		;IF END OF LIST, DONT STORE BACK POINTER
	STOR T2,ENQLJQ,(T3)	;FIX UP BACK POINTER
	STOR T3,ENQNJQ,(T2)	;AND FORWARD POINTER
	LOAD T2,ENQLLQ,(T1)	;NOW REMOVE IT FROM LOCK CHAIN
	LOAD T3,ENQNLQ,(T1)
	STOR T2,ENQLLQ,(T3)
	STOR T3,ENQNLQ,(T2)
	LOAD T2,ENQLRQ,(T1)	;NOW REMOVE IT FROM THE MULTIPLE LIST
	LOAD T3,ENQFQ,(T1)
	STOR T2,ENQLRQ,(T3)
	STOR T3,ENQFQ,(T2)
	MOVEM T2,QDEQRQ		;SAVE ADDRESS OF NEXT Q-BLOCK
	CAMN T2,T1		;IS THE MULTIPLE LIST EMPTY?
	SETZM QDEQRQ		;YES, RETURN 0 IN T1 ON RETURN
	LOAD T2,ENQLBP,(T1)	;GET ADDRESS OF LOCK BLOCK
	LOAD T3,ENQNR,(T1)	;GET NUMBER OF RESOURCES REQUESTED
	LOAD T4,ENQRR,(T2)	;GET REMAINING RESOURCES COUNT
	ADD T4,T3		;GIVE BACK OUR RESOURCES
	LOAD T3,ENQFLG,(T1)	;GET FLAGS OF REQUEST
	TRNE T3,EN.LOK		;WAS LOCK LOCKED?
	STOR T4,ENQRR,(T2)	;YES, GIVE BACK RESOURCES
	MOVEM T2,QDEQLB		;REMEMBER THE LOCK-BLOCK FOR LATER
	LOAD T3,ENQCNT		;DECREMENT THE QUOTA COUNT
	SOS T3
	LOAD T4,ENQOFN,(T2)	;GET THE OFN VALUE
	CAIE T4,-3		;IF -3 LOCK, DONT DECREMENT QUOTA
	STOR T3,ENQCNT		;STORE UPDATED COUNT
	MOVE T3,QDEQLB		;GET ADR OF LOCK BLOCK
	LOAD T4,ENQFBP,(T3)	;GET POINTER TO FREE Q-BLOCK IF ANY
	JUMPE T4,[STOR T1,ENQFBP,(T3)
		JRST QDEQ0]	;IF NO FREE Q-BLOCK, SAVE THIS ONE
	LOAD T2,ENQNMS,(T3)	;GET THE SIZE OF THE MASK BLOCK
	LOAD T1,ENQMSK,(T1)	;GET THE ADDRESS OF THE MASK BLOCK
	SKIPE T1		;IS THERE A MASK BLOCK?
	CALL RELEQ		;YES, RELEASE ITS SPACE
	MOVE T1,QDEQQA		;GET BACK THE ADR OF THE Q-BLOCK
	MOVEI T2,QBLEN		;NOW GIVE BACK THE Q-BLOCK SPACE
	CALL RELEQ		;...
QDEQ0:	MOVE T1,QDEQLB		;GET ADR OF LOCK-BLOCK
	CALL LOKSKD		;[7.1072] (T1/T1)Do a scheduling pass on the lock
   IFN CLEQIN,<			;[8846][7.1179] 
	CALL QDLBFS		;[8846][7.1179] (T1/T1)Set Lock-Block flags
   >				;[8846][7.1179]

;[7.1072] Note:  The scheduling pass is done on locks that may be empty so that
;[7.1072] other nodes will be notified of the rescheduling event. This is  done
;[7.1072] through  the  call to EQLKSD. Should the Lock-Block have no Q-Blocks,
;[7.1072] then LOKSKD will do nothing more than notify the other nodes and return.
;[8846]   LOKSKD is called before QDLBFS so that a notification will be sent if
;[8846]   the lock was a cluster-wide lock and the last Q-Block was just DEQed.
;[8846]   When this happens, the Lock-Block will have EN.CLL cleared because it
;[8846]   does not have Q-Blocks with EN.CLL set (so it is not a cluster-wide 
;[8846]   lock).

	LOAD T2,ENQNLQ,(T1)	;SEE IF LOCK IS EMPTY
	CAMN T2,T1		;[7.1072] ...
	CALL LOKREL		;RELEASE THE LOCK-BLOCK
QDEQ1:	MOVE T1,QDEQRQ		;GET Q-BLOCK ADR OF MULTIPLE REQUEST
	RET			;AND RETURN
 	SUBTTL	QDLBFS (Set LB Flags after QB Release)
   IFN CLEQIN,<			;[7.1179]

;[7.1179]  QDLBFS - Set Lock-Block flags after Q-Block release
;
;This  routine is used to properly set flag EN.CLL after a Q-Block has
;been  dequeued.  It  inspects  the  flags  of  every  Q-Block   still
;associated  with  the Lock-Block. If any have EN.CLL set then it will
;set EN.CLL in the Lock-Block flags. Otherwise, EN.CLL will be cleared
;since there are no cluster-wide requests associated  with  the  lock.
;Note  that  EN.CLL  should always be cleared for a Lock-Block with no
;Q-Blocks (as is the case for a cached Lock-Block or a long-term  lock
;with no associated requests.)
;
;	T1/ Lock-Block address
;
;	CALL QDLBFS
;
;Returns +1:	Always with EN.CLL correctly set in the Lock-Block flags.
;		Preseves T1.

QDLBFS: MOVE T2,T1		;Save address of Lock-Block
	LOAD T3,ENQFLG,(T1)	;Get Lock-Block flags
	TXZ T3,EN.CLL		;Assume not a cluster-wide lock
QDLOOP:	LOAD T2,ENQNLQ,(T2)	;Step to the next Q-Block
	CAMN T2,T1		;Back to the Lock-Block yet?
	JRST QDDONE		;Yes, done
	LOAD T4,ENQFLG,(T2)	;Get the flags of this Q-Block
	JXE T4,EN.CLL,QDLOOP	;Keep looking if not a cluster-wide request
	TXO T3,EN.CLL		;Found a cluster-wide request
QDDONE:	STOR T3,ENQFLG,(T1)	;Store updated flags
	RET			;All done
   >				;[7.1179]
	SUBTTL	LOKREL (Release a Lock-Block)

;ROUTINE TO RELEASE A LOCK-BLOCK

;ACCETPS IN T1/	LOCK BLOCK ADDRESS
;	CALL LOKREL
;RETURNS +1:	ALWAYS - LOCK BLOCK GIVEN BACK TO FREE POOL

LOKREL:	STKVAR <LOKRLQ,LOKRLM,LOKRLN>
;   IFN CFSCOD,<			;If CFS
	MOVEM T1,LOKRLQ		;Save the block address
	LOAD T1,ENQOFN,(T1)	;Get the OFN
	HRRES T1
	SKIPLE T1		;An OFN?
	CALLX (MSEC1,CFSDEQ)	;[7.1040] yes. Release the resource
	MOVE T1,LOKRLQ		;Restore block address
;   >	;IFN CFSCOD
	LOAD T2,ENQFBP,(T1)	;GET POINTER TO FREE Q-BLOCK IF ANY
	MOVEM T2,LOKRLQ		;REMEMBER IT IF IT NEEDS RELEASING
	SKIPE T3,T2		;ANY FREE Q-BLOCK?
	LOAD T3,ENQMSK,(T2)	;YES, GET THE POINTER TO THE MASK BLOCK
	MOVEM T3,LOKRLM		;SAVE THE ADR TO THE MASK BLOCK
	LOAD T3,ENQNMS,(T1)	;GET THE SIZE OF THE MASK BLOCK
	MOVEM T3,LOKRLN		;SAVE IT FOR LATER
	LOAD T2,ENQFLG,(T1)	;GET THE FLAGS
	TXNE T2,EN.LTL		;IS THIS A LONG TERM LOCK?
	JRST LOKRL1		;YES, DO NOT RELEASE IT YET
	LOAD T2,ENQLHC,(T1)	;REMOVE LOCK-BLOCK FROM HASH CHAIN
	LOAD T3,ENQNHC,(T1)
	STOR T2,ENQLHC,(T3)
	STOR T3,ENQNHC,(T2)
   IFN CLEQIN,<			;[7.1072] 
	SOS EQLBCT		;[7.1115] One less block on the list
	LOAD T2,ENQABP,(T1)	;[7.1072] Get previous block on action list
	LOAD T3,ENQAFP,(T1)	;[7.1072] Get the next block
	CAME T1,EQLBLT		;[7.1072] Are we deleting the first block?
	IFSKP.			;[7.1072] Yes
	  MOVEM T3,EQLBLT	;[7.1072] Make head of list be next block
	  CAIN T3,-1		;[7.1088] Was first block the only block?
	  JRST LOKRL2		;[7.1088] Yes
	  STOR T2,ENQABP,(T3)	;[7.1088] Make new BLINK point to last block
	ELSE.			;[7.1072] Not removing first block
	  STOR T3,ENQAFP,(T2)	;[7.1072] Make previous FLINK point to next
	ENDIF.			;[7.1072] 
	CAIN T3,-1		;[7.1088] Is the last block being deleted?
	MOVE T3,EQLBLT		;[7.1088] Yes, so first block BLINK must change
	STOR T2,ENQABP,(T3)	;[7.1072] Make next BLINK point back to previous
   >				;[7.1072] 
LOKRL2:	LOAD T2,ENQLEN,(T1)	;[7.1088] GET THE LENGTH OF THE LOCK-BLOCK
	CALL RELEQ		;RELEASE THE SPACE
	MOVEI T2,QBLEN		;NOW RELEASE THE Q-BLOCK
	SKIPE T1,LOKRLQ		;IF THERE WAS ONE
	CALL RELEQ		;RELEASE IT
	MOVE T2,LOKRLN		;GET THE LENGTH OF THE MASK BLOCK
	SKIPE T1,LOKRLM		;IS THERE A MASK BLOCK TO RELEASE
	CALL RELEQ		;YES, RELEASE IT
	RET			;ALL DONE
LOKRL1:	LOAD T2,ENQLT,(T1)	;GET POINTER TO LONG TERM LOCK LIST
	CAIE T2,-1		;IS THIS ALREADY ON A LIST?
	RET			;YES, NO NEED TO PUT IT ON AGAIN
	MOVEI T3,ENQLTL-.ENQLT	;GET ORIGIN OF LIST HEADER FOR LONG TERM LOCK
	LOAD T2,ENQLT,(T3)	;GET POINTER TO FIRST LOCK
	STOR T2,ENQLT,(T1)	;LINK THIS LOCK ONTO HEAD OF THAT LIST

	STOR T1,ENQLT,(T3)	;THIS LOCK IS NOW FIRST ON THE LIST
	RET			;AND EXIT, LOCK GETS RELEASED LATER
	SUBTTL	QSKD/QSKDRC (Perform a scheduling pass on Q-Block)

;ROUTINE TO DO A SCHEDULING PASS GIVEN A Q-BLOCK ADDRESS

;ACCEPTS IN T1/	Q-BLOCK ADDRESS
;	CALL QSKD
;RETURNS +1:	THIS REQUEST IS NOT FULLY LOCKED YET
;	 +2:	THIS REQUEST IS FULLY LOCKED
;		T1 = 0  IF ALREADY LOCKED BEFORE THIS CALL
;		T1 = -1 IF THE LOCKING WAS COMPLETED ON THIS CALL
;[7.1072]
;[7.1072] QSKDRC is an alternate entry point used by EVQSKD to check on Q-Block
;[7.1072] compatibility.  It only performs the checks at CHKLK1 (and beyond) and
;[7.1072] does not actually schedule anything.
;[7.1072] 
;[7.1072] 		T1/ Lock-Block address
;[7.1072] 		T2/ Mask block address in VRQA
;[7.1072] 		T3/ Mask block size in VRQA
;[7.1072] 		T4/ Flags (from EBQFLG),,Group number (from EBGRP)
;[7.1072] 
;[7.1072] Returns +1:	Vote request not compatible with local Q-Blocks
;[7.1072]         +2:	Vote request is compatible with local Q-Blocks
;[7.1072] 
;[7.1072] Preserves T1.  Note that the STKVAR must match the one in QSKD.

   IFN CLEQIN,<			;[7.1072]
QSKDRC::SAVEAC <T1,Q1,Q2,Q3>	;[7.1072] 
	STKVAR <QSKDQ,QSKDT,CKLOKQ,QSKDF,QSKDG,QSKDM,QSKDN,QSFLG,QSENT>  ;[7.1072]
	SETOM QSENT		;[7.1072] Entered CHKLKV
	HLRZM T4,QSFLG		;[7.1072] Save flags
	HRRZM T4,QSKDG		;[7.1072] Save group number
	MOVEM T3,QSKDN		;[7.1072] Save mask block length
	MOVEM T2,QSKDM		;[7.1072] Save mask block address
	JRST CHKLK1		;[7.1072] Perform the compatibility checks
   >				;[7.1072] 

QSKD:	SAVEQ
	STKVAR <QSKDQ,QSKDT,CKLOKQ,QSKDF,QSKDG,QSKDM,QSKDN,QSFLG,QSENT>  ;[7.1072]
	SETZM QSENT		;[7.1072] Entered QSKD
	SETZM QSKDF		;ASSUME LOCK ALREADY LOCKED ON CALL
	MOVEM T1,QSKDQ		;SAVE THE ADDRESS OF THIS Q-BLOCK
	CALL SETINV		;MAKE SURE INVISIBLE BITS SET OK
	 JRST QSKD0		;GO MAKE SCHEDULING PASS
	JRST QSKD3		;LOCK IS ALREADY LOCKED
QSKD0:	MOVE T1,QSKDQ		;GET ADDRESS OF THIS Q-BLOCK AGAIN
QSKD1:	MOVEM T1,QSKDT		;SAVE IT IN A TEMPORARY REGISTER
	LOAD T2,ENQMSK,(T1)	;GET THE ADR TO THE MASK BLOCK
	MOVEM T2,QSKDM		;SAVE THE ADR OF THE MASK BLOCK
	LOAD T2,ENQLBP,(T1)	;GET THE POINTER TO THE LOCK BLOCK
	LOAD T2,ENQNMS,(T2)	;GET THE LENGTH OF THE MASK BLOCK
	MOVEM T2,QSKDN		;SAVE IT FOR LATER
	LOAD T2,ENQGRP,(T1)	;GET GROUP # OF THIS Q ENTRY
	MOVEM T2,QSKDG		;SAVE FOR COMPARISON LATER
	LOAD T2,ENQFLG,(T1)	;GET THE FLAGS OF THIS Q-BLOCK
	TRNE T2,EN.LOK!EN.INV	;IS THE LOCK LOCKED BY THIS Q-BLOCK
				; OR AN INVISIBLE Q-BLOCK?
	JRST QSKD2		;YES, GO CONTINUE SCANNING SIDEWAYS
	MOVEM T2,QSFLG		;[7.1072] Save for later comparison
CHKLK1:	LOAD T1,ENQLLQ,(T1)	;GET PREVIOUS BLOCK ON QUEUE
        MOVE T3,QSFLG		;[7.1072] Get flags of original block
	LOAD T4,ENQFLG,(T1)	;GET THE FLAGS OF THIS BLOCK
	TRNE T4,EN.LB		;IS THIS THE LOCK-BLOCK?
	JRST CHKLK2		;YES, WE ARE AT TOP OF QUEUE
	TRNE T4,EN.INV		;NO, IS THIS Q-BLOCK INVISIBLE?
	JRST CHKLK1		;YES, IGNORE THIS BLOCK ENTIRELY
   IFN CLEQIN,<			;[8846] Only for cluster-wide code
	SKIPN QSENT		;[8846] Did we enter QSKDRC?
	IFSKP.			;[8846] Yes
	  TXNN T4,EN.LOK	;[8846] Does Q-Block have lock locked?
	  JRST CHKLK1		;[8846] No, its waiting so just ignore it
	ENDIF.			;[8846] 
   >				;[8846] End of IFN CLEQIN
	TRNN T4,EN.EXC		;IS THIS AN EXCLUSIVE REQUEST?
	TRNE T3,EN.EXC		;OR IS ORIGINAL REQUEST EXCLUSIVE?
	JRST CHKLK3		;YES, GO CHECK MASK BLOCKS
	LOAD T2,ENQGRP,(T1)	;GET GROUP NUMBER OF THIS Q
	CAME T2,QSKDG		;IS THIS THE SAME GROUP
	RET			;NO, CANNOT SCHEDULE THIS REQUEST
	JRST CHKLK1		;LOOP BACK UNTIL AT LOCK-BLOCK
CHKLK2:	SKIPE QSENT		;[7.1072] Did we enter QSKED?
	RETSKP			;[7.1072] No, return - no incompatibilites
   IFN CLEQIN,<			;[7.1072] 
	MOVE T1,QSKDT		;[7.1072] Get the Q-Block address
	CALL EQQSKD		;[7.1072] (T1/T1,T4)Cluster-wide arbitration
	 RET			;[7.1072] Someone said "NO"!
	LOAD T1,ENQLBP,(T1)	;[7.1072] Get pointer to Lock-Block
   >				;[7.1072] 
   IFE CLEQIN,<			;[7.1072] If cluster code not present
	LOAD T4,ENQRR,(T1)	;GET THE # OF REMAINING RESOURCES
   >				;[7.1072] 
	MOVE T3,QSKDT		;GET THE NUMBER OF RESOURCES NEEDED
	LOAD T3,ENQNR,(T3)	;...
	SUB T4,T3		;SEE IF ENOUGH LEFT FOR THIS REQUEST
	JUMPL T4,R		;IF NOT, LOCK CANNOT BE LOCKED
	STOR T4,ENQRR,(T1)	;THERE ARE ENOUGH, LOCK THE LOCK
	MOVE T3,QSKDT		;GET BACK ADR OF Q-BLOCK
	LOAD T2,ENQFLG,(T3)	;GET FLAGS AGAIN
	TRO T2,EN.LOK		;LOCK THE LOCK BIT
	STOR T2,ENQFLG,(T3)	;STORE THE UPDATED FLAGS
	LOAD T2,ENQNLQ,(T3)	;NOW MOVE THIS Q-BLOCK TO THE HEAD
	LOAD T4,ENQLLQ,(T3)	;   OF THE QUEUE FOR THIS LOCK
	STOR T2,ENQNLQ,(T4)	;FIRST REMOVE IT FROM THE QUEUE
	STOR T4,ENQLLQ,(T2)	;...
	LOAD T2,ENQNLQ,(T1)	;NOW ADD IT TO THE START OF THE QUEUE
	STOR T3,ENQLLQ,(T2)	;  POINTER BACK TO Q-BLOCK FROM Q-2
	STOR T3,ENQNLQ,(T1)	;  POINTER TO Q-BLOCK FROM LOCK-BLOCK
	STOR T2,ENQNLQ,(T3)	;  POINTER TO SECOND Q-BLOCK
	STOR T1,ENQLLQ,(T3)	;  POINTER BACK TO LOCK-BLOCK
	CALLX (MSEC1,LGTAD)	;[7.1040] GET TIME AND DATE
	MOVE T3,QSKDT		;GET Q-BLOCK ADDRESS
	LOAD T3,ENQLBP,(T3)	;GET LOCK BLOCK ADDRESS
	STOR T1,ENQTS,(T3)	;STORE NEW TIME STAMP IN LOCK BLOCK
	MOVE T1,QSKDQ		;GET ORIGINAL Q-BLOCK ADDRESS
	SETOM QSKDF		;MARK THAT A LOCK WAS LOCKED
	CALL SETINV		;GO CLEAR ANY INVISIBLE BITS
	 JRST QSKD0		;LOCK NOT FULLY LOCKED YET, TRY AGAIN
	JRST QSKD3		;LOCK IS LOCKED, GO GIVE OK RETURN

QSKD2:	MOVE T2,QSKDT		;GET Q-BLOCK ADR OF PRESENT Q-BLOCK
	LOAD T1,ENQFQ,(T2)	;STEP TO NEXT Q-BLOCK IN THIS REQUEST
	CAME T1,QSKDQ		;ARE WE BACK TO THE Q-BLOCK STARTED AT?
	JRST QSKD1		;NO, GO CHECK IF THIS Q LOCKED
QSKD3:	MOVE T1,QSKDF		;GET BACK ANSWER TO BE RETURNED
	RETSKP			;AND SKIP RETURN
CHKLK3:	LOAD T3,ENQMSK,(T1)	;YES, CHECK FOR MASKS
	SKIPE T4,QSKDM		;IS THERE A MASK FOR THIS Q-BLOCK
	JUMPN T3,CHKLK4		;YES, DO BOTH BLOCKS HAVE A MASK?
	JUMPN T4,CHKLK5		;NO, ONLY ONE HAVE A MASK?
	JUMPE T3,R		;IF NEITHER HAVE A MASK, THEN CANNOT LOCK
	MOVE T4,T3		;GET ADR OF MASK BLOCK TO USE
CHKLK5:	MOVE T3,QSKDN		;GET LENGTH OF MASK BLOCK
CHKLK6:	SKIPE 0(T4)		;ARE THERE ANY BITS ON IN MASK?
	RET			;YES, THEN CANNOT LOCK IT NOW
	AOS T4			;STEP TO NEXT WORD IN MASK
	SOJG T3,CHKLK6		;LOOP BACK TIL SCANNED WHOLE MASK
	JRST CHKLK1		;THESE Q-BLOCKS CAN CO-EXIST

CHKLK4:	MOVE Q1,QSKDN		;GET LENGTH OF MASK BLOCK
CHKLK7:	MOVE Q2,0(T3)		;GET NEXT WORD IN MASK BLOCK
	AND Q2,0(T4)		;AND IN THE NEXT MASK BLOCK IN OTHER BLOCK
	JUMPN Q2,R		;IF OVERLAPPED, THEN CANNOT LOCK YET
	AOS T3			;STEP TO NEXT MASK WORD
	AOS T4			;IN BOTH BLOCKS
	SOJG Q1,CHKLK7		;LOOP BACK
	JRST CHKLK1		;THESE Q-BLOCKS CAN CO-EXIST

	ENDSV.			;[7.1072]
	SUBTTL	SETINV (Set Q-Block invisible)

;ROUTINE TO CLEAR INVISIBLE BITS AS Q-BLOCKS GET LOCKED

;ACCEPTS IN T1/	Q-BLOCK ADDRESS OF ONE ELEMENT OF A REQUEST
;	CALL SETINV
;RETURNS +1:	REQUEST NOT FULLY LOCKED YET
;	 +2:	REQUEST IS NOW FULLY LOCKED

SETINV:	STKVAR <SETINQ,SETINU>
	MOVSI T2,1		;INITIALIZE LEVEL NUMBER SCANNER
	MOVEM T2,SETINU		;...
	MOVEM T1,SETINQ		;REMEMBER Q-BLOCK ADDRESS
SETIN1:	LOAD T2,ENQLBP,(T1)	;GET ADDRESS OF LOCK-BLOCK FOR Q
	LOAD T4,ENQLVL,(T2)	;GET LEVEL NUMBER OF THIS LOCK
	LOAD T3,ENQFLG,(T1)	;GET Q FLAGS
	TRNE T3,EN.LOK		;IS THIS Q ALREADY LOCKED?
	JRST SETIN2		;YES
	CAMG T4,SETINU		;NO, IS THIS A NEW LOW VALUE?
	MOVEM T4,SETINU		;YES, REMEMBER LOWEST NON-LOCKED LEVEL
SETIN2:	LOAD T1,ENQFQ,(T1)	;GET NEXT Q-BLOCK IN THIS REQUEST
	CAME T1,SETINQ		;ARE WE BACK TO STARTING POINT?
	JRST SETIN1		;NO, LOOP BACK FOR OTHER Q-BLOCKS
	MOVE T2,SETINU		;GET LEVEL NUMBER
	TLNE T2,-1		;SEE IF AN UNLOCKED LOCK WAS SEEN
	RETSKP			;NONE SEEN, THE LOCK IS FULLY LOCKED
SETIN3:	LOAD T2,ENQLBP,(T1)	;GET ADR OF LOCK-BLOCK FOR THIS Q
	LOAD T4,ENQLVL,(T2)	;GET LEVEL NUMBER OF LOCK
	LOAD T3,ENQFLG,(T1)	;GET FLAGS OF THIS Q-BLOCK
	CAMG T4,SETINU		;IS LEVEL ABOVE LOWEST UNLOCKED LEVEL?
	TRZA T3,EN.INV		;NO, MAKE THIS Q-BLOCK VISIBLE
	TRO T3,EN.INV		;YES, THE Q-BLOCK MUST REMAIN INVISIBLE
	STOR T3,ENQFLG,(T1)	;STORE UPDATED FLAGS
	LOAD T1,ENQFQ,(T1)	;GET ADR OF NEXT Q-BLOCK IN REQUEST
	CAME T1,SETINQ		;HAVE WE SEEN ALL Q-BLOCKS?
	JRST SETIN3		;NO, LOOP BACK UNTIL ALL SEEN
	RET			;YES, ALL THROUGH (REQ NOT TOTALLY 
				;   LOCKED)
	SUBTTL	LOKSKD/REESKD (Perform a scheduling pass on Lock-Block)

;ROUTINE TO MAKE A SCHEDULING PASS GIVEN A LOCK-BLOCK ADDRESS

;ACCEPTS IN T1/	LOCK-BLOCK ADDRESS
;	CALL LOKSKD
;RETURNS +1:	ALWAYS - ALL NEWLY LOCKED REQUESTS INTERRUPTED
;
;[7.1072] Preserves T1.
;[7.1072] 
;[7.1072] Routine REESKD is an alternate entry point, used by the ENQ fork,
;[7.1072] to perform a rescheduling without sending notification to the 
;[7.1072] other nodes in the cluster.

   IFN CLEQIN,<			;[7.1072] 
REESKD::SAVEAC <T1>		;[7.1072] Preserve T1
	STKVAR <LOKSKL,LOKSKQ,LOKSKC,LOKENT>  ;[7.1072]
	SETZM LOKENT		;[7.1072] Say that REESKD was entered
	JRST LOKSDC		;[7.1072] Join the common code
   >				;[7.1072] 

LOKSKD: SAVEAC <T1>		;[7.1072] Preserve T1
	STKVAR <LOKSKL,LOKSKQ,LOKSKC,LOKENT>  ;[7.1072]
	SETOM LOKENT		;[7.1072] Say that LOKSKD was entered
LOKSDC:	MOVEM T1,LOKSKL		;[7.1072] SAVE ADDRESS OF LOCK FOR LATER
	MOVEM T1,LOKSKQ		;INITIALIZE Q-BLOCK ADDRESS REGISTER
   IFN CLEQIN,<			;[7.1072] 
	SKIPE LOKENT		;[7.1072] Should other nodes be notified?
	CALL EQLKSD		;[7.1072] (T1/T1)Yes so do it
	CALL EQPOOL		;[7.1072] (T1/T1,T2)Get remaining resources
   >				;[7.1072] Also notifies other nodes of scheduling
   IFE CLEQIN,<			;[7.1072] If cluster ENQ code not present
	LOAD T2,ENQRR,(T1)	;GET REMAINING RESOURCES IN POOL
   >				;[7.1072] 
	MOVEM T2,LOKSKC		;SAVE COUNT OF RESOURCES
LOKSK1:	LOAD T1,ENQNLQ,(T1)	;STEP TO NEXT Q-BLOCK ON QUEUE
	CAMN T1,LOKSKL		;BACK TO THE LOCK-BLOCK YET?
	RET			;YES, SCHEDULING PASS IS DONE
	MOVEM T1,LOKSKQ		;UPDATE POINTER TO CURRENT Q-BLOCK
	LOAD T2,ENQFLG,(T1)	;GET FLAGS OF THE Q-BLOCK
	TRNE T2,EN.INV		;INVISIBLE?
	JRST LOKSK1		;YES, IGNORE IT
	TRNE T2,EN.LOK		;THIS Q ALREADY LOCKED?
	JRST LOKSK3		;YES, DONT DECREMENT RESOURCE COUNT
	LOAD T2,ENQNR,(T1)	;GET NUMBER OF RESOURCES REQUESTED
	MOVE T3,LOKSKC		;GET REMAINING RESOURCES
	SUB T3,T2		;DECREMENT COUNT
	JUMPL T3,R		;IF NOT ENOUGH LEFT, EXIT
	MOVEM T3,LOKSKC		;STORE NEW COUNT
LOKSK3:	CALL QSKD		;GO SEE IF THIS REQUEST IS LOCKED
	 JRST LOKSK2		;NO
	JUMPE T1,LOKSK2		;IF NOT JUST LOCKED, DONT INTERRUPT
	MOVE T1,LOKSKQ		;GET Q-BLOCK ADDRESS
	CALL INTQ		;INTERRUPT THE PROCESS
LOKSK2:	MOVE T1,LOKSKQ		;GET Q-BLOCK ADDRESS AGAIN
	JRST LOKSK1		;LOOP BACK FOR REST OF QUEUE
	SUBTTL	INTQ (Wake up a waiting fork when lock is locked)

;ROUTINES TO WAKE UP OR INTERRUPT WAITING FORKS WHEN LOCK IS LOCKED

;ROUTINE TO WAKE UP A FORK GIVEN THE Q-BLOCK JUST LOCKED

;ACCEPTS IN T1/	Q-BLOCK ADDRESS
;	CALL INTQ
;RETURNS +1:	ALWAYS - FORK AWAKENED OR INTERRUPTED AS APPROPRIATE

INTQ:	LOAD T2,ENQFRK,(T1)	;GET FORK TO BE AWAKENED
	LOAD T1,ENQCHN,(T1)	;GET CHANNEL #
	CAIN T1,.ENWCH		;[7.1040] IS FORK BLOCKED OR NOT
	IFSKP.			;[7.1040] 
	  XCALLRET (MSEC1,PSIRQ);[7.1040] NOT BLOCKED, GIVE IT AN INTERRUPT
	ENDIF.			;[7.1040] 
	MOVE T1,T2		;GET FORK # IN T1
	PUSH P,T1		;SAVE FORK #
	CALL <XENT GETMSK>	;[7.1040] GET THE BIT POSITION AND WORD INDEX
	IORM T2,ENFKTB(T1)	;SET BIT IN ENQ FORK TABLE
	POP P,T1		;GET BACK FORK NUMBER
	XCALLRET (MSEC1,UNBLKF)	;[7.1040] UNBLOCK THE FORK
	SUBTTL	ENQTST (Scheduler test)

;ROUTINE TO TEST IF A FORK IS READY TO CONTINUE (CALLED BY SCHEDULER)

;ACCEPTS IN T1/	FORK #
;	JSP T4,ENQTST
;RETURNS +1:	FORK NOT READY TO CONTINUE
;	 +2:	FORK IS READY TO BE CONTINUED, LOCK IS LOCKED

	RESCD

ENQTST:	PUSH P,T4		;SAVE RETURN ADDRESS
	XCALL (XCDSEC,GETMSK)	;[7.1040] GET BIT POSITION AND WORD INDEX
	TDNN T2,ENFKTB(T1)	;IS FORK READY TO CONTINUE?
	RET			;NO
	RETSKP			;YES

	XSWAPCD			;[7.1040] 
	SUBTTL	ASGEQ (Get space for an ENQ block)

;ROUTINE TO GET SPACE FOR AN ENQ BLOCK

;ACCEPTS IN 1/	LENGTH OF BLOCK DESIRED
;	CALL ASGEQ
;RETURNS +1:	NO ROOM
;	 +2	T1/	ADR OF BLOCK

ASGEQ:	STKVAR <ASGENC>
	MOVEM T1,ASGENC		;SAVE COUNT OF WORDS NEEDED
	MOVEI T1,ENQFSX		;[7.1180] Get ENQ freespace pool index
	CALLX (MSEC1,FSPREM)	;[7.1180] (T1/T1,T2,T3) Get the space left
	CAMGE T3,ASGENC		;[7.1258] Do we have a block that we will fit into?
	JRST ASGEN2		;[7.1258] No, so free up some space
	MOVE T1,ASGENC		;[7.1180] Get number of words needed
	CALLX (MSEC1,ASGENQ)	;[7.1040] (T1/T1)Get space
	 JRST ASGEN2		;[7.1180] Failed, go try to free up some
	RETSKP

ASGEN2:	HRLOI T1,377777		;RELEASE ALL LONG TERM LOCKS
	CALL <XENT ENQGC>	;[7.1072] BRUTE FORCE TECHNIQUE TO GET SPACE
	MOVEI T1,ENQFSX		;[7.1180] Get ENQ freespace pool index
	CALLX (MSEC1,FSPREM)	;[7.1180] (T1/T1,T2,T3) Get the space left
	CAMGE T3,ASGENC		;[7.1258] Do we have a block that we will fit into?
	RETBAD (MONX06)		;[7.1258] No, return error to user
	MOVE T1,ASGENC		;GET NUMBER OF WORDS NEEDED
	CALLX (MSEC1,ASGENQ)	;[7.1040] (T1/T1)Get space
	 RETBAD ()		;[7.1180]
	RETSKP

	ENDSV.			;[7.1180]
	SUBTTL	RELEQ (Release ENQ block space)

;ROUTINE TO RELEASE ENQ SPACE

;ACCEPTS IN T1/	ADR OF BLOCK
;	    T2/	LENGTH OF BLOCK
;	CALL RELEQ
;RETURNS +1:	ALWAYS

RELEQ:	XCALLRET (MSEC1,RELENQ)	;[7.1040] Release the block
	SUBTTL	ENQGC (Garbage collection of long term locks)

;ROUTINE TO GARBAGE COLLECT LONG TERM LOCKS

;ACCEPTS IN T1/	TIME STAMP FOR DELETING LOCK BLOCKS
;	CALL ENQGC
;RETURNS +1:	ALWAYS

XNENT	(ENQGC)			;[7.1040] ENQGC: and XENQGC:
	MOVE T2,ENQLTL		;ANY LOCKS ON THE LIST?
	JUMPE T2,R		;NO
	SAVEQ			;GET SOME ACS TO USE
	MOVEI Q1,ENQLTL-.ENQLT	;GET POINTER TO HEAD OF LIST
	MOVE Q3,T1		;SAVE TIME STAMP
ENQGC1:	LOAD T1,ENQLT,(Q1)	;GET NEXT LOCK ON LIST
	JUMPE T1,R		;0 MEANS NO MORE
	LOAD T2,ENQTS,(T1)	;WHEN WAS THE LAST TIME IT WAS USED
	CAMGE T2,Q3		;IS IT TOO OLD?
	JRST ENQGC2		;YES, GO DELETE IT
	MOVE Q1,T1		;GET POINTER TO THIS LOCK INTO Q1
	JRST ENQGC1		;LOOP BACK FOR ALL LOCKS ON LIST

ENQGC2:	LOAD T2,ENQLT,(T1)	;NOW REMOVE THIS LOCK FROM THE LIST
	STOR T2,ENQLT,(Q1)	;MAKE LIST SKIP OVER THIS ONE
	MOVEI T2,-1		;MARK THAT THIS ONE IS NOT ON LIST
	STOR T2,ENQLT,(T1)
	LOAD T2,ENQFLG,(T1)	;TURN OFF THE LONG TERM LOCK FLAG
	TXZ T2,EN.LTL		;SO IT WILL BE RELEASED
	STOR T2,ENQFLG,(T1)
	LOAD T2,ENQNLQ,(T1)	;NOW SEE IF THE LOCK IS FREE
	CAME T2,T1		;[7348] It is free if it points to itself
	IFSKP.			;[7348] 
	  SETZRO ENQOFN,(T1)	;[7348] It is free - zero OFN to avoid call ...
	  CALL LOKREL		;[7348] (T1/) ... to CFSDEQ when releasing it
	ENDIF.			;[7348] 
	JRST ENQGC1		;LOOP BACK FOR REST OF LIST
	SUBTTL	HASH (Calculate hash index)

;ROUTINE TO CALCULATE AN INDEX INTO THE HASH TABLE

;REQUIRES THAT P1 - P4 BE SET UP BY VALREQ
;	CALL HASH
;RETURNS +1:	ILLEGAL ARGUMENT - ERROR CODE IN T1
;	 +2:	HASH INDEX IN T1
;		P4 CONTAINS WORD LENGTH OF STRING

HASH:	SETZ P4,		;INITIALIZE CHARACTER COUNT
	MOVE T1,P2		;GET STRING POINTER
	LDB T2,[POINT 3,T1,2]	;SEE IF A CODE OR STRING POINTER
	CAIN T2,5		;...
	JRST HASH1		;USER CODE (500000,,0 + 33-BIT NUMBER)
	CALL STHASH		;HASH THE STRING
	 RET			;ILLEGAL STRING POINTER
	MOVEM T2,P4		;SAVE CHARACTER COUNT
   IFN CLEQIN,<			;[7.1072] 
HASH1:	MOVE T4,T1		;[7.1072] Save the first number for a moment
	HRRE T2,P1		;[7.1072] Get OFN code and extend sign
	SKIPGE T2		;[7.1072] Is this a file lock?
	IFSKP.			;[7.1072] Yes
	  LOAD T1,STRX,(T2)	;[7.1072] Get the structure number for this OFN
	  LOAD T2,STGADR,SPTH(T2)  ;[7.1072] Get index block address
	  MOVE T1,STRTAB(T1)	;[7.1072] Get SDB address
	  SKIPE SDBALS(T1)	;[7.1072] Is there an alias?
	  SKIPA T1,SDBALS(T1)	;[7.1072] Yes use it
	  MOVE T1,SDBNAM(T1)	;[7.1072] No, use physical name
	  CALL MHASH		;[7.1072] (T1,T2/T1)Hash these two values
	  MOVE T2,T1		;[7.1072] Make returned value the second number
	  MOVE T1,T4		;[7.1072] Get saved first value
	ELSE.			;[7.1072] No
	  HRRZS T2    		;[7.1072] So get OFN code again
	ENDIF.			;[7.1072] 
   >
   IFE CLEQIN,<			;[7.1072] 
HASH1:	HRRZ T2,P1		;GET OFN CODE
   >				;[7.1072] 
	CALL MHASH		;HASH THE TWO NUMBERS TOGETHER
	MOVMS T1		;MAKE SURE IT IS POSITIVE
	IDIVI T1,HSHLEN		;GET FINAL HASH INDEX
	MOVE T1,T2		;USE REMAINDER
	IMULI T1,2		;ACCOUNT FOR THE FACT THAT A HSHTBL SLOT IS
				; 2 WORDS IN LENGTH
	RETSKP			;AND GIVE OK RETURN
	SUBTTL	HASH (Calculate hash index) -- MHASH (Hash two numbers)

;ROUTINE TO HASH TWO NUMBERS TOGETHER

;ACCEPTS IN T1/	NUMBER
;	    T2/	NUMBER
;	CALL MHASH
;RETURNS +1:	ALWAYS - T1/	HASH

MHASH:	XOR T1,RANDOM		;GUARD AGAINST A ZERO IN T1
	XOR T2,RANDOM		;OR IN T2
	MUL T2,RANDOM		;GET A RANDOM NUMBER
	MUL T1,T2		;...
	RET

RANDOM:	5*5*5*5*5*5*5*5*5*5*5*5*5*5*5
	SUBTTL	HASH (Calculate hash index) -- STHASH (Hash a string)

;ROUTINE TO HASH A STRING

;ACCEPTS IN T1/	STRING POINTER IN USER SPACE
;	CALL STHASH
;RETURNS +1:	ILLEGAL STRING POINTER - ERROR CODE IN T1
;	 +2:	HASH IN T1
;		# OF WORDS IN STRING IN T2

STHASH:	STKVAR <STHSHP,STHSHX,STHSHC,STHSHB,STHSHN,STHSHM>
	MOVEM T1,STHSHP		;SAVE POINTER
	LDB T2,[POINT 6,T1,11]	;GET THE BYTE SIZE
	MOVEI T3,^D36		;GET NUMBER OF BYTES PER WORD
	IDIVI T3,(T2)		;...
	MOVEM T3,STHSHN		;SAVE NUMBER OF BYTES PER WORD
	IMULI T3,ENQMXW		;GET MAX NUMBER OF CHARACTERS ALLOWED
	MOVEM T3,STHSHM		;SAVE FOR LATER
	AND T1,[007700,,0]	;BUILD A BYTE POINTER
	TDO T1,[POINT 0,T2]	;POINTING TO AC T2
	MOVEM T1,STHSHB		;SAVE IT FOR LATER
	SETZM STHSHC		;INITIALIZE THE COUNT OF CHARACTERS
	SETZM STHSHX		;INITIALIZE ANSWER REGISTER
STHSH1:	MOVE T4,STHSHN		;INITIALIZE COUNTER
	MOVE T3,STHSHB		;AND BYTE POINTER
	SETZ T2,		;INITIALIZE RECEIVER AC
STHSH2:	AOS T1,STHSHC		;COUNT UP CHARACTER COUNTER
	CAMLE T1,STHSHM		;STRING TOO LONG?
	RETBAD (ENQX19)		;YES, GIVE ERROR RETURN
	XCTBU [ILDB T1,STHSHP]	;GET A BYTE FROM THE USER'S STRING
	JUMPE T1,STHSH3		;END OF STRING?
	IDPB T1,T3		;NO, STORE CHARACTER IN T2
	SOJG T4,STHSH2		;LOOP BACK FOR 5 CHARACTERS
	XORM T2,STHSHX		;XOR THIS INTO ANSWER WORD
	JRST STHSH1		;LOOP BACK UNTIL END OF STRING
STHSH3:	XORM T2,STHSHX		;STORE PARTIAL WORD TOO
	MOVE T1,STHSHX		;GET ANSWER
	MOVE T2,STHSHC		;GET CHARACTER COUNT
	IDIV T2,STHSHN		;GET NUMBER OF WORDS
	SKIPE T3		;AND PARTIAL WORDS IN THE STRING
	AOS T2
	RETSKP			;AND RETURN
	SUBTTL	ENQFKR (DEQ all requests for a fork)

;ROUTINE TO DEQ ALL REQUESTS FOR A FORK

;ACCEPTS IN T1/	FORK NUMBER
;	CALL ENQFKR  OR  CALL DEQFRK (IF DATA BASE ALREADY LOCKED)
;RETURNS +1:	ALWAYS

	SWAPCD			;[7.1040]

ENQFKR::MOVEI T2,ENQLST		;GET FIRST Q-BLOCK OF JOB
	LOAD T2,ENQNJQ,(T2)	;ANY LOCKS LOCKED FOR THIS JOB?
	JUMPE T2,R		;IF NOT, THEN EXIT NOW
        CALL LOCKIT		;[7.1072] ()Obtain needed database locks
	SETO T2,		;DEQ ALL
	CALL DEQFRK		;DEQUEUE ALL ENTRIES FOR THIS FORK
	CALL ULOKIT		;[7.1072] ()Release the database locks
	RET			;AND RETURN
	SUBTTL	ENQFKR (DEQ all requests for a fork) -- DEQFRK (Worker routine)

;ROUTINE TO DEQ FOR A FORK
;ACCEPTS IN T1/	FORK #
;	    T2/	-1 FOR ALL, OR AN ID TO BE MATCHED
;	CALL DEQFRK
;RETURNS +1 ALWAYS - T1/	COUNT OF LOCKS DEQUEUED

;	XSWAPCD			;[7.1040] 

XNENT	(DEQFRK)		;[7.1040] DEQFRK: and XDEQFR:
	STKVAR <DEQFKF,DEQFKQ,DEQFKI,DEQFCT>
	SETZM DEQFCT		;INIT COUNT OF DEQUEUED LOCKS TO 0
	MOVEM T1,DEQFKF		;SAVE FORK NUMBER ON STACK
	MOVEM T2,DEQFKI		;SAVE ID
DEQFK0:	MOVEI T1,ENQLST		;GET FIRST Q-BLOCK OF JOB
	LOAD T1,ENQNJQ,(T1)	;...
DEQFK1:	JUMPE T1,DEQFK2		;IF NO MORE, GO EXIT
	LOAD T2,ENQFRK,(T1)	;GET FORK NUMBER OF CREATOR OF Q
	LOAD T3,ENQID,(T1)	;GET ID OF Q-ENTRY
	SKIPL DEQFKI		;IS THIS A DELETE ALL REQUEST?
	CAMN T3,DEQFKI		;NO, IS THIS A MATCH?
	CAME T2,DEQFKF		;YES, IS THIS TO BE DELETED?
	JRST [	LOAD T1,ENQNJQ,(T1) ;NO, STEP TO NEXT Q-BLOCK IN CHAIN
		JRST DEQFK1]	;LOOP BACK TILL END OF LIST
	CALL REQDEQ		;YES, DELETE IT
	AOS DEQFCT		;COUNT UP NUMBER OF LOCKS DEQUEUED
	JRST DEQFK0		;START OVER AGAIN AT START OF LIST

DEQFK2:	MOVE T1,DEQFCT		;GET THE COUNT OF LOCKS RELEASED
	RET			;AND RETURN
	SUBTTL	ENQJBI (Initialize JSB upon job creation)

;ROUTINE TO INITIALIZE THE JSB ON JOB CREATION

XNENT	(ENQJBI,G)		;[7.1040] ENQJBI:: and XENQJB::
	SAVEAC <T1,T2>
	MOVEI T2,ENQLST		;GET ADDRESS OF Q-LIST HEADER	
	SETZM T1		;GET A ZERO
	STOR T1,ENQLJQ,(T2)	;ZERO BACK POINTER
	STOR T1,ENQNJQ,(T2)	;ZERO FORWARD POINTER
	STOR T1,ENQCNT		;ZERO COUNT OF REQUESTS
	MOVEI T1,ENQSTQ		;GET STANDARD ENQ/DEQ QUOTA
	STOR T1,ENQOTA		;STORE IN JSB
	RET			;AND RETURN
	SUBTTL	ENQCLS (Check for ENQ lock on OFN)

;ROUTINE TO CHECK IF AN OFN HAS A LOCK SET ON IT

;ACCEPTS IN T1/	OFN
;	    T2/ JFN
;	CALL ENQCLS
;RETURNS +1:	OFN IS LOCKED, FILE CANNOT BE CLOSED OR MADE LONG
;	 +2:	OFN IS NOT LOCKED BY THIS JOB

	SWAPCD			;[7.1040] 

ENQCLS::MOVEM T2,T4		;SAVE JFN BEING CLOSED
	NOINT			;LOCK UP THE DATA BASE DURING SCAN
	LOKK ENQLKK		;[7.1072] Only need local database lock for check
	MOVEI T2,ENQLST		;GET FIRST Q-BLOCK OF JOB
	LOAD T2,ENQNJQ,(T2)	;...
ENQCL1:	JUMPE T2,ENQCL2		;IF 0, END OF LIST AND OFN IS OK
	LOAD T3,ENQLBP,(T2)	;GET ADDRESS OF LOCK BLOCK
	LOAD T3,ENQOFN,(T3)	;GET OFN OF LOCK
	CAMN T1,T3		;THE SAME OFN?
	JRST [	LOAD T3,ENQJFN,(T2) ;YES, GET JFN OF REQUEST
		CAME T3,T4	;IS JFN OF REQUEST BEING CLOSED ?
		JRST .+1	;NO, GO SCAN REST OF THE LIST
		UNLOKK ENQLKK	;YES, FILE CANNOT BE CLOSED
		OKINT
		MOVEI T1,ENQX20	;GET ERROR CODE
		RET]		;GIVE ERROR RETURN
	LOAD T2,ENQNJQ,(T2)	;GET ADDRESS OF NEXT Q IN LIST
	JRST ENQCL1		;LOOP TIL END OF LIST

ENQCL2:	UNLOKK ENQLKK		;UNLOCK THE LOCKS
	OKINT
	RETSKP			;GIVE OK RETURN
	SUBTTL	ENQINI (Initialize ENQ database upon system startup)

;ROUTINE TO INITIALIZE THE DATA BASE ON SYSTEM START UP

;	CALL ENQINI
;RETURNS +1:	ALWAYS

;	SWAPCD			;[7.1040]

ENQINI::			;[7.1172]
   IFN CLEQIN,<			;[7.1172]
	MOVEI T1,-1		;[7.1172] Initialize ...
	MOVEM T1,EQLBLT		;[7.1172] ... the action list
	SETZM EQLBCT		;[7.1172][7.1115] And initialize count of blocks
   >				;[7.1172]
	SETZM ENFKTB		;ZERO THE WAKEUP TABLE
	MOVE T1,[ENFKTB,,ENFKTB+1]
	MOVEI T2,ENFKTL
	CAILE T2,1		;DO BLT ONLY IF TABLE MORE THAN 1 WORD
	BLT T1,ENFKTB-1+ENFKTL
	MOVE T1,[HSHTBL]	;INITIALIZE HASH TABLE
	MOVEI T2,HSHLEN		;GET NUMBER OF ELEMENTS IN TABLE
ENQIN1:	MOVEM T1,0(T1)		;STORE POINTERS TO SELF
	MOVEM T1,1(T1)		;...
	ADDI T1,2		;STEP TO NEXT LOGICAL CELL
	SOJG T2,ENQIN1		;LOOP BACK FOR ALL ENTRIES
	SETZM ENQLTL		;INIT LONG TERM LOCK LIST
	SETZM ENQLTS		;AND TIME STAMP
	INILCK ENQLKK		;INIT THE ENQ LOCK BLOCK
	RET			;RETURN

	TNXEND
	END