*DECK DMLLCK                                                            000110
      PROC DMLLCK (FIT,REALMORD,ERRRTRN); 
  BEGIN                                                                 000130
 #
* *   DMLLCK - LOCK INTERFACE ROUTINE 
*     W. REHLING                                      10/25/77
* 
* DC  PURPOSE 
* 
*     ISSUE A LOCK REQUEST TO CDCS AND
*     CHECK FOR AN ERROR CONDITION UPON RETURNING FROM CDCS.
*     ON ERROR, CAUSES A BRANCH TO AN ALTERNATE RETURN IN THE 
*     APPLICATION PROGRAM IF SPECIFIED, ELSE, RETURNS NORMALLY. 
*     RETURN THE FIT STATUS FIELD TO THE APPLICATION PROGRAM
* 
* DC  ENTRY CONDITIONS
* 
* DC  PARAMETERS
* 
*     FIT  --    APPLICATION PROGRAM FIT FOR REALM TO BE LOCKED 
* 
*     REALMORD  -- ORDINAL OF THE REALM TO BE LOCKED
* 
*     ERRRTRN  --  (OPTIONAL) ALTERNATE RETURN ON ERROR (FTN 5 ONLY)
*                  WARNING:  DO NOT REFERENCE - MAY NOT BE PRESENT
* 
* DC  ASSUMPTIONS 
* 
*     COMMON BLOCK DB0000 HAS BEEN GENERATED AND INITIALIZED
* 
* 
* DC  EXIT CONDITIONS 
* 
*     UPON RETURN FROM CDCS, THE FIT ES FIELD IS STORED 
*     IN DBSTAT AND IN DBSXXXX AND DBREALM IS SET TO THE
*     NAME OF THE REALM IN THE DML STATEMENT. 
*     CONTROL IS RETURNED TO THE APPLICATION PROGRAM. 
*     THE RETURN POINT CAN BE ALTERED GIVEN AN *ON ERROR* 
*     LABEL AND THE DETECTION OF AN ERROR (FTN 5 ONLY). 
* 
* DC  CALLING ROUTINES
* 
*     DMLLCK IS CALLED FROM THE APPLICATION PROGRAM 
*     AS A RESULT OF A DML LOCK STATEMENT.
* 
* DC  CALLED ROUTINES 
* 
*     DB$LOKF  --     CDCS LOCK INTERFACE ROUTINE 
* 
*     DMLRTRN  --  RETURN ROUTINE--SETS REGISTER TO RETURN PARAMETER
* 
* DC  NON-LOCAL VARIABLES 
* 
*     VARIABLES IN DB0000 WHICH ARE MODIFIED ARE: 
*     DBSTAT, DBSXXXX, DBREALM
* 
* DC  DESCRIPTION 
* 
*     A CALL TO DMLLCK IS GENERATED BY THE PREPASS AS 
*     A RESULT OF A DML LOCK STATEMENT. DMLLCK ISSUES THE LOCK
*     REQUEST TO CDCS, RETURNS THE FIT STATUS FIELDS TO THE APPLICATION 
*     PROGRAM, AND RETURNS CONTROL TO THE APPLICATION PROGRAM.
*     WITH FORTRAN 5, AN ALTERNATE RETURN CAN BE SPECIFIED.  IF AN
*     ERROR IS DETECTED, CONTROL IS PASSED TO THE SPECIFIED LABEL 
*     IN THE APPLICATION PROGRAM. 
* 
 #
      CONTROL EJECT;                                                    000140
      CONTROL DISJOINT;                                                 000150
      CONTROL INERT;                                                    000160
                                                                        000170
                                        #-------------DEFS-------------#
  
      DEF FITSIZE     # 35 #;           # SIZE OF FIT IN WORDS         #000200
                                                                        000210
# THE FOLLOWING ARE PARAMETERS FROM THE "LOCK" CALLING SEQUENCE        #000220
                                                                        000230
      ARRAY FIT;                 # USER FIT                            #000240
*CALL FITDCLS                                                           000250
                                                                        000260
      ITEM REALMORD;                        # REALM ORDINAL            #000270
  
      ITEM ERRRTRN;                         # ERROR RETURN PARAMETER   #
                                            # WARNING: DO NOT REFERENCE#
                                                                        000280
# THE FOLLOWING DESCRIBES THE COMMON BLOCK CREATED IN THE FORTRAN      #000290
#     PROGRAM                                                          #000300
                                                                        000310
      COMMON DB0000;                                                    000320
*CALL DB0DCLS                                                           000330
                                                                        000340
                                        #------------XREFS-------------#
  
      XREF
        BEGIN 
        PROC DB$LOKF;                   # LOCK INTERFACE ROUTINE       #
        PROC DMLRTRN;                   # SET RETURN REGISTER ROUTINE  #
        END 
  
                                        #----------LOCAL ITEMS---------#
  
      ITEM RTNPARM;                     # RETURN PARAMETER - DMLRTRN   #
  
      CONTROL EJECT;                                                    000380
                                                                        000390
# SET UP POINTER TO REALMBLOCK   #                                      000400
      P<REALMBLOCK> = LOC(FIT) - 4;                                     000410
      P<DBTXXXX> = LOC(FIT) + FITSIZE;                                  000430
                                                                        000420
# ISSUE LOCK REQUEST PASSING THE FIT AND REALM ORDINAL                 #000430
                                                                        000440
      DB$LOKF(FIT,REALMORD);                                            000450
                                                                        000460
# RETURN ERROR STATUS FIELD OF FIT                                     #000470
                                                                        000480
      DBSTAT = FITES[0];                                                000490
      DBSXXXX = FITES[0];                                               000610
      DBREALM = DBRXXXX;                                                000620
                                                                        000520
# CHECK ERROR STATUS ON CDCS CALL                                      #
  
      IF (FITES[0] NQ 0)                # IF CDCS/CRM ERROR OCCURRED   #
      THEN
        RTNPARM = 1;                    # SET THE RETURN PARAMETER TO 1#
      ELSE                              #             ELSE             #
        RTNPARM = 0;                    # SET THE RETURN PARAMETER TO 0#
  
# SET THE RETURN REGISTER                                              #
  
      DMLRTRN(RTNPARM); 
  
# RETURN TO THE APPLICATION PROGRAM                                    #
  
      RETURN;                                                           000530
      END                                                               000540
TERM                                                                    000550
