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Assembly Source File | 1988-10-27 | 17.1 KB | 509 lines

PAGE 60,132 TITLE DESQview BASIC File Locking Interface Copyright 1988 by Jon Martin ;--------------------------------------------------------------------; ;ROUTINE: LOCKDV AUTHOR: Jon Martin ; ; 4396 N. Prairie Willow Ct. ; ; Concord, California 94521 ; ; ; ;DATE: October 23, 1988 VERSION: 1.0 ; ; ; ;DESCRIPTION: This subroutine enables programs written in Compiled ; ; BASIC to do Semaphore type resource locking when ; ; running in a DESQview environment. Care was taken ; ; to allow the program to be fully DESQview aware. ; ; Programs calling this interface in a non DESQview ; ; environment will totally ignore the lock and unlock ; ; requests. BEGINC (Begin critical) and ENDC (End ; ; critical) are used in a pre DESQview 2.00 environment. ; ; API calls to Create and Test for the presence of ; ; mailboxes are used to implement the resource locking ; ; strategy when running in a DESQview 2.00 or higher ; ; environment. ; ; ; ; LOCKING - Get resource name ; ; Find mailbox using resource name ; ; If found then pause and loop until not found ; ; Create mailbox using resource name ; ; return to calling program ; ; UNLOCKING - Get resource name ; ; Find mailbox using resource name ; ; If not found then return to calling program ; ; If found then Close and Free mailbox ; ; Return to calling program ; ; ; ; BEGINC and ENDC have been wrapped around ; ; those processes that were determined to be ; ; necessary. ; ; ; ;FUNCTION: This routine supports calls from the IBM (MICROSOFT) ; ; BASIC Version 2.0 or Microsoft QuickBASIC Versions 1.0, ; ; 2.01, 3.0, 4.00b & 4.50 compilers to the DESQview User ; ; Interface. The calls are: ; ; ; ; CALL DVLOCK(resource name) ; ; a) returns if DESQview is not present ; ; b) issues Begin Critical if DESQview level < 2.00 ; ; c) issues Lock Mailbox if DESQview level ; ; >= 2.00 ; ; ; ; CALL DVUNLOCK(resource name) ; ; a) returns if DESQview is not present ; ; b) issues End Critical if DESQview level <2.00 ; ; c) issues Unlock Mailbox if DESQview level ; ; >= 2.00 ; ; ; ; NOTE: "resource" must be a string and not exceed 32 characters ; ; Link this with your BASIC program in the following manner ; ; ; ; LINK PGMNAME+LOCKDV,,,; ; ; ; ;--------------------------------------------------------------------; LOCKDV SEGMENT BYTE PUBLIC 'CODE' ASSUME CS:LOCKDV,DS:LOCKDV,ES:LOCKDV ORG 0 .xlist .SALL ; DESQview API interfaces ;*************************************************************** ; ; Function numbers (AX values) for the @CALL interface ; ;*************************************************************** DVC_PAUSE EQU 1000H DVC_PRINTC EQU 1003H DVC_GETBIT EQU 1013H DVC_FREEBIT EQU 1014H DVC_SETBIT EQU 1015H DVC_ISOBJ EQU 1016H DVC_LOCATE EQU 1018H DVC_SOUND EQU 1019H DVC_OSTACK EQU 101AH DVC_BEGINC EQU 101BH DVC_ENDC EQU 101CH DVC_STOP EQU 101DH DVC_START EQU 101EH DVC_DISPEROR EQU 101FH DVC_PGMINT EQU 1021H DVC_POSWIN EQU 1023H DVC_GETBUF EQU 1024H DVC_USTACK EQU 1025H DVC_POSTTASK EQU 102BH DVC_NEWPROC EQU 102CH DVC_KMOUSE EQU 102DH DVC_APPNUM EQU 1107H DVC_DBGPOKE EQU 110AH DVC_APILEVEL EQU 110BH DVC_GETMEM EQU 110CH DVC_PUTMEM EQU 110DH DVC_FINDMAIL EQU 110EH DVC_PUSHKEY EQU 1110H DVC_JUSTIFY EQU 1111H DVC_CSTYLE EQU 1112H DVC_DVPRESENT EQU 0FFFFH DVC_SHADOW EQU 0FFFEH DVC_UPDATE EQU 0FFFDH ;*************************************************************** ; ; Message numbers (BH values) for the @SEND interface ; ;*************************************************************** DVM_HANDLE EQU 00H DVM_NEW EQU 01H DVM_FREE EQU 02H DVM_ADDR EQU 03H DVM_DIR EQU 03H DVM_READ EQU 04H DVM_APPLY EQU 04H DVM_WRITE EQU 05H DVM_SIZEOF EQU 08H DVM_LEN EQU 09H DVM_ADDTO EQU 0AH DVM_SUBFROM EQU 0BH DVM_OPEN EQU 0CH DVM_CLOSE EQU 0DH DVM_ERASE EQU 0EH DVM_STATUS EQU 0FH DVM_EOF EQU 10H DVM_AT EQU 11H DVM_SETSCALE EQU 11H DVM_SETNAME EQU 11H DVM_READN EQU 12H DVM_GETSCALE EQU 12H DVM_REDRAW EQU 13H DVM_SETESC EQU 14H DVM_LOCK EQU 14H ;*************************************************************** ; ; Alias numbers (BL values) for the @SEND interface ; ;*************************************************************** DVA_TOS EQU 00H DVA_ME EQU 01H DVA_MAILTOS EQU 02H DVA_MAILME EQU 03H DVA_KEYTOS EQU 04H DVA_KEYME EQU 05H DVA_OBJQTOS EQU 06H DVA_OBJQME EQU 07H DVA_WINDOW EQU 08H DVA_MAILBOX EQU 09H DVA_KEYBOARD EQU 0AH DVA_TIMER EQU 0BH DVA_POINTER EQU 0FH DVA_PANEL EQU 10H ;*************************************************************** ; ; @SEND interface macro - bombs AH and BX ; ;*************************************************************** @SEND macro message,object ifdef DVA_&object MOV BX,DVM_&message*256+DVA_&object MOV AH,12H INT 15H else @PUSH &object @SEND &message,TOS endif endm ;*************************************************************** ; ; @CALL interface macro - bombs AX ; ;*************************************************************** @CALL macro func local L1 ifndef DVC_&func MOV AX,&func INT 15H else if (DVC_&func eq DVC_APILEVEL) CMP BX,200H ; is 2.00 sufficient ? JB L1 ; jump if so MOV AX,DVC_APILEVEL ; issue the call INT 15H CMP AX,2 ; early version 2.00 ? JNE L1 ; jump if not XCHG BH,BL ; reverse bytes MOV AX,DVC_APILEVEL ; reissue call INT 15H XCHG BH,BL ; correct byte order L1: else if (DVC_&func eq DVC_DVPRESENT) PUSH BX ; save registers PUSH CX PUSH DX MOV AX,2B01H ; DOS Set Date function XOR BX,BX ; in case outside DESQview MOV CX,'DE' ; invalid date value MOV DX,'SQ' INT 21H MOV AX,BX ; version # to AX CMP AX,2 ; early DV 2.00 ? JNE L1 ; jump if not XCHG AH,AL ; swap bytes if so L1: POP DX ; restore registers POP CX POP BX else if (DVC_&func eq DVC_SHADOW) MOV AH,0FEH INT 10H else if (DVC_&func eq DVC_UPDATE) MOV AH,0FFH INT 10H else MOV AX,DVC_&func INT 15H endif endif endif endif endif endm ;*************************************************************** ; ; @PUSH and supporting macros - pushes 32-bit values on the stack ; ;*************************************************************** @PUSH_ESDI macro PUSH ES PUSH DI endm @PUSH_DSSI macro PUSH DS PUSH SI endm @PUSH_BXAX macro PUSH BX PUSH AX endm @PUSH_DXCX macro PUSH DX PUSH CX endm @PUSH_ESSI macro PUSH ES PUSH SI endm @PUSH_DSDI macro PUSH DS PUSH DI endm @PUSH macro parm ifdef @PUSH_&parm @PUSH_&parm else PUSH WORD PTR &parm+2 PUSH WORD PTR &parm endif endm ;*************************************************************** ; ; @POP and supporting macros - pops 32-bit values from the stack ; ;*************************************************************** @POP_ESDI macro POP DI POP ES endm @POP_DSSI macro POP SI POP DS endm @POP_BXAX macro POP AX POP BX endm @POP_DXCX macro POP CX POP DX endm @POP_ESSI macro POP SI POP ES endm @POP_DSDI macro POP DI POP DS endm @POP macro parm ifdef @POP_&parm @POP_&parm else POP WORD PTR &parm POP WORD PTR &parm+2 endif endm ;*************************************************************** ; ; @MOV and supporting macros - moves 32-bit values to/from memory ; ;*************************************************************** @DV_LOAD macro seg,off,arg MOV &seg,WORD PTR &arg+2 MOV &off,WORD PTR &arg endm @DV_STORE macro seg,off,arg MOV WORD PTR &arg+2,&seg MOV WORD PTR &arg,&off endm @MOV_ESDI macro mac,arg &mac ES,DI,&arg endm @MOV_DSSI macro mac,arg &mac DS,SI,&arg endm @MOV_BXAX macro mac,arg &mac BX,AX,&arg endm @MOV_DXCX macro mac,arg &mac DX,CX,&arg endm @MOV_ESSI macro mac,arg &mac ES,SI,&arg endm @MOV_DSDI macro mac,arg &mac DS,DI,&arg endm @MOV macro dest,src ifdef @MOV_&dest @MOV_&dest @DV_LOAD,&src else @MOV_&src @DV_STORE,&dest endif endm ;*************************************************************** ; ; @CMP macro - compares BX:AX to DWORD in memory ; ;*************************************************************** @CMP macro parm local L1 CMP AX,WORD PTR &parm JNE L1 CMP BX,WORD PTR &parm+2 L1: endm .list CX_HOLD DW 0 SEMAPHORE DD 0 RESOURCE DB ' ' DVLOCK PROC FAR PUBLIC DVLOCK PUSH BP ;save base pointer MOV BP,SP ;establish new base PUSH DS ;save BASIC data segment PUSH ES ;save BASIC extra segment MOV BX,[BP+6] ;get string descriptor MOV DX,[BX+2] ;get address of string MOV CX,[BX] ;get length of string MOV CS:CX_HOLD,CX ;save length of string PUSH CS ;setup for ES POP ES ;ES now points to us MOV SI,DX ;offset of BASIC'S string LEA DI,CS:RESOURCE ;point to resource name CLD ;start from bottom REP MOVSB ;copy string to resource name @CALL DVPRESENT ;test for DESQview TEST AX,AX ;well is it there? JZ LK_EXIT ;zero means no MOV BX,200H ;set API level required CMP AX,BX ;is required level supported? JNB APILKSEM ;not below means ok! @CALL BEGINC ;start critical LK_EXIT: JMP DVLOCK_EXIT ;exit lock resource APILKSEM: @CALL APILEVEL ;set API level LOOP_SEMA: @CALL BEGINC ;start critical LEA DI,CS:RESOURCE ;point to resource mailbox nm PUSH CS ;setup for ES POP ES ;ES now points to us MOV CX,CS:CX_HOLD ;setup resource name len XOR DX,DX ;clear high register @CALL FINDMAIL ;find the resource mailbox TEST BX,BX ;did we find it? JZ MAKE_SEMA ;zero means nope! @CALL ENDC ;end critical @CALL PAUSE ;let's wait for awhile JMP LOOP_SEMA ;let's go try again MAKE_SEMA: @SEND NEW,MAILBOX ;create resource mailbox @POP CS:SEMAPHORE ;save semaphore LEA DI,CS:RESOURCE ;point to resource mailbox nm PUSH CS ;setup for ES POP ES ;ES now points to us @PUSH_ESDI ;put address on stack MOV CX,CS:CX_HOLD ;setup resource name len XOR DX,DX ;clear high register @PUSH_DXCX ;put length on stack @SEND SETNAME,CS:SEMAPHORE ;let's give it a name @CALL ENDC ;end critical DVLOCK_EXIT: POP ES ;restore BASIC extra segment POP DS ;restore BASIC data segment POP BP ;restore BASIC base pointer RET 2 ;return to BASIC DVLOCK ENDP DVUNLOCK PROC FAR PUBLIC DVUNLOCK PUSH BP ;save base pointer MOV BP,SP ;establish new base PUSH DS ;save BASIC data segment PUSH ES ;save BASIC extra segment MOV BX,[BP+6] ;get string descriptor MOV DX,[BX+2] ;get address of string MOV CX,[BX] ;get length of string MOV CS:CX_HOLD,CX ;save length of string PUSH CS ;setup for ES POP ES ;ES now points to us MOV SI,DX ;offset of BASIC'S string LEA DI,CS:RESOURCE ;point to resource name CLD ;start from bottom REP MOVSB ;copy string to resource name @CALL DVPRESENT ;test for DESQview TEST AX,AX ;well is it there? JZ UNLKSEMA_EXIT ;zero means no MOV BX,200H ;set API level required CMP AX,BX ;is required level supported? JNB APIULSEM ;not below means ok! @CALL ENDC ;end critical UNLKSEMA_EXIT: JMP DVUNLOCK_EXIT ;exit unlock resource APIULSEM: @CALL APILEVEL LEA DI,CS:RESOURCE ;point to resource mailbox nm PUSH CS ;setup for ES POP ES ;ES now points to us MOV CX,CS:CX_HOLD ;setup resource name len XOR DX,DX ;clear high register @CALL FINDMAIL ;find resource mailbox TEST BX,BX ;did we find it? JZ DVUNLOCK_EXIT ;zero means nope! @MOV CS:SEMAPHORE,DSSI ;found so save semaphore @CALL BEGINC ;begin critical @SEND CLOSE,CS:SEMAPHORE ;unlock resource mailbox @SEND FREE,CS:SEMAPHORE ;release resource mailbox @CALL ENDC ;end critical DVUNLOCK_EXIT: POP ES ;restore BASIC extra segment POP DS ;restore BASIC data segment POP BP ;restore BASIC base pointer RET 2 ;return to BASIC DVUNLOCK ENDP LOCKDV ENDS END