Enter your search terms Submit search form
	Web pdp-10.trailing-edge.com

 %TITLE 'WFGETBKT - allocate a bucket'
MODULE WFGETBKT (				! Allocate a bucket
		IDENT = '3-001'			! File: WFGETBKT.BLI Edit: CJG3001
		) =
BEGIN
!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 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.
!
!
!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	Allocate a bucket.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: October 16, 1978
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 23-Feb-1981.  This module was created by
!	extracting routine GET_NEW_BUKT from module EDTWF.
! 1-002	- Regularize headers.  JBS 16-Mar-1981
! 1-003	- Change SY_EXIT to EDT$$SYS_EXI .  JBS 31-Mar-1981
! 1-004 - Modify to use EDT$WORKIO. STS 15-Feb-1982
! 1-005 - Call WF_EXT if running on 11's. STS 26-Feb-1982
! 1-006 - Add literals for callable parameters. STS 08-Mar-1982
! 1-007	- Fix module name.  JBS 07-Apr-1982
! 1-008	- Fix work file overflow message.  JBS 05-Jul-1982
! 3-001 - Remove call to EDT$$CALLWIO. CJG 13-Jun-1983
!--

%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$WF_ALOBUF : NOVALUE;

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$WF_ALOBUF  - allocate a bucket'

GLOBAL ROUTINE EDT$$WF_ALOBUF 			! Allocate a bucket
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine allocates a new bucket from the work-file.  If there
!	is a bucket available on the deleted bucket list, use it, otherwise
!	take the next higher numbered bucket.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	WK_GRTSTBUK
!	WK_BUK
!
! IMPLICIT OUTPUTS:
!
!	WF_DESC
!	WK_AVAIL
!	WK_CURBUK
!	WK_GRTSTBUK
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	If the work file overflows, never returns to its caller.
!
!--

    BEGIN


    EXTERNAL ROUTINE
	EDT$$FMT_MSG,				! Put the text of a message in the format buffer
	EDT$$FMT_CRLF,				! Terminate the line being built in the format buffer
	EDT$$WF_RD : NOVALUE,			! Read from the work file
	EDT$$WF_MAKECUR : NOVALUE,
	EDT$$SYS_EXI;				! Leave EDT abruptly

    EXTERNAL
	WF_DESC : BLOCK,		! descriptor for workfile record
	WK_AVAIL,			! Pointer to next available deleted bucket
	WK_CURBUK,			! Number of the current bucket
	WK_GRTSTBUK,			! Largest bucket number in use
	WK_BUK : 			! Pointer to current bucket
	    REF BLOCK [WF_BUKT_SIZE] FIELD (WFB_FIELDS);

    MESSAGES ((WRKFILOVF));

    IF (.WK_AVAIL NEQ 0)
    THEN
	BEGIN
	EDT$$WF_MAKECUR (.WK_AVAIL);
	WK_AVAIL = .WK_BUK [WFB_NEXT_BUKT];
	END
    ELSE
	BEGIN
!+
! Check for overflow
!-

	IF ((.WK_GRTSTBUK EQL 0) OR 	!
	    (.WK_GRTSTBUK GTRU 65535))
	THEN
	    BEGIN
	    EDT$$FMT_MSG (EDT$_WRKFILOVF);
	    EDT$$FMT_CRLF ();
	    EDT$$SYS_EXI (EDT$_WRKFILOVF);
	    END;

!+
! Inform the caching routines that we are creating a new bucket.
! On the 11's we have to bring another bucket into the cache specially
!-

	EDT$$WF_RD (.WK_GRTSTBUK, WF_DESC);

	WK_BUK = .WF_DESC [DSC$A_POINTER];	!get address of record
	WK_CURBUK = .WK_GRTSTBUK;
!+
! And bump the largest bucket number.
!-
	WK_GRTSTBUK = .WK_GRTSTBUK + 1;
	END;

    END;					! End of routine EDT$$WF_ALOBUF


END
ELUDOM