Harbour MiniGUI Extended Edition 2.5.4 Published on 22nd Oct 2015

gfilatov@front.ru [harbourminigui] harbourminigui@yahoogroups.com via returns.groups.yahoo.com	21 Oct (5 days ago)
to harbourminigui

 

Hi Friends,

I am glad to announce a new version of Harbour MiniGUI Extended Edition.

The setup of the build 2.5.4 is published at the following URL:

http://hmgextended.com/files/CONTRIB/hmg-2.5.4-setup.zip

and the MinGW-based self-extracting archive is placed at the following URL:

http://hmgextended.com/files/CONTRIB/hmg254-mingw.exe

There are also the extra xHarbour.org-based and xHarbour.com-based archives
for this build at the Minigui's download homepage.

There is the following changelog for this build:

2015/10/21: HMG Extended Edition 2.5.4 Published.
  * Fixed: Wrong handling of a return value of the internal C-functions
           InsertMenu() and ModifyMenu(). The return of these functions is
           a logical value but is not a handle (similarly to the C-function
           AppendMenu()).
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see demo2.prg in folder \samples\Advanced\MRU)
  * Enhanced: TOOLBAREX control with the pictures from ImageList supports now
           the changing of a toolbutton picture at runtime.
           - New: Added a write only 'PictureIndex' property for TOOLBAREX.
           You can set this property at runtime:
           - function syntax:
             SetProperty ( Form, Control, 'PictureIndex', nPictureIndex )
           - pseudo-OOP syntax:
             FormName.ToolBarName.ToolButtonName.PictureIndex := nPictureIndex,
           where nPictureIndex is a position of selected image in the ImageList.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see 'Standard Window' in demo at folder \samples\Basic\MAINDEMO_(SYNTAX_I))
  * Enhanced: DEFINE IMAGELIST command supports JPG, GIF, TIF and PNG images.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see demo in folder \samples\Advanced\FREEVIEW)
  * Enhanced: Command CLEAN MEMORY operates now at Win Vista and upper for
           release of unused memory.
           Sample code:
              ON KEY F5 ACTION CLEAN MEMORY
           or
              DEFINE TIMER ... ACTION ( hb_gcAll(), CLEAN MEMORY )
           Based upon a contribution of Claudio Soto <srvet@adinet.com.uy>.
  * Changed: WebCam User Component was moved from the samples to MiniGUI core.
           Syntax:
             @ , WEBCAM [ OF ] ;
             [ WIDTH ] [ HEIGHT ] ;
             [ RATE ] [ START ]
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see demo in folder \samples\Advanced\WebCam_2)
  * Modified: Correction of the empty values of Active font name and font size
           with the Default font name and size at the Form's definition.
           Suggested by SergKis.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
  * Updated: Further replacing of 'ValType(Var) == "U"' definitions in the
           MiniGUI core with the functions hb_default()/__defaultNIL() and
           hb_defaultValue().
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
  * Updated: C-code cleaning for correct compiling with Pelles C 8.0 and xHarbour.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
  * Updated: Adaptation FiveWin Class TSBrowse 9.0 in HMG:
           - added handling of the Browse vars hFontEdit, hFontHead, hFontFoot
             and hFontSpcHd in TSColumn class.
           Contributed by SergKis.
  * Updated: 'Bos Taurus' Graphics Library (see source in folder \Source\BosTaurus):
           - added a new function BT_DrawTextEx().
           Based upon a contribution of Claudio Soto <srvet@adinet.com.uy>.
           Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
           (see demos in folder \samples\Advanced\BosTaurus)
  * Updated: HbSQLite3 library:
           - update for using SQLITE3 version 3.9.1 (from 3.8.11.1).
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
  * Updated: Harbour Compiler 3.2.0dev (SVN 2015-10-13 23:05).
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (look at ReadMe.txt in folder \harbour)
  * New: 'Systray Balloon Tips' sample is based upon the HbWin contrib library.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see in folder \samples\Advanced\TrayBalloon_3)
  * New: 'Just To Tray' sample: minimize the external appls to system tray.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see in folder \samples\Applications\JustToTray)
           Warning: This example don't work properly at 64-bit version of Windows.
  * Updated: 'FreeImage Viewer' sample: using an ImageList from PNG resource
           for the toolbutton's pictures in the toolbar.
           Contributed by Grigory Filatov <gfilatov@inbox.ru>
           (see in folder \samples\Advanced\FREEVIEW)

There is a "last minute" modification also in this build:

  * Updated: 'HMG Debugger' library (see source in folder \Source\Debugger).
           Based upon a contribution of Claudio Soto <srvet@adinet.com.uy>.
           Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
           (see demo in folder \samples\Advanced\DBG_TEST)

It is a regularly scheduled maintenance release.

This release is considered stable and ready for production use.

--
Best Regards,
Grigory Filatov
[MiniGUI Team]

HMGS-IDE 1.3.0 binary and sources Published - 17th June 2015

gfilatov@front.ru [harbourminigui] <harbourminigui@yahoogroups.com>	17 Jun
to harbourminigui

 

Hi All,

The updated HMGS-IDE 1.3.0 binary and sources are published
at the following URL:
http://www.hmgextended.com/files/HMGS-IDE/ide.zip

Whatsnew:
     *New   : added control CHECKLABEL
     *New   : added control CHECKLISTBOX (work in progress)
     *Changed : save on fmg property BACKGROUNDCOLOR to BKGNDCOLOR for control MONTHCALENDAR
     *Added : properties LOWERCASE UPPERCASE to control COMBOBOX
     *Added : properties MARQUEE VELOCITY to control PROGRESSBAR
     *Added : property NOXPSTYLE to control BUTTON
     *Added : properties NOMINUS BORDER  to control GETBOX
     *Added : properties BACKGROUNDCOLOR ADJUSTIMAGE TOOLTIP to control IMAGE
     *Added : properties  MULTITAB  MULTICOLUN  to control LISTBOX
     *Added : events:  ON MOUSEHOVER ONMOUSELEAVE to control LABEL
     *Added : property HANDCURSOR to control BUTTONEX
     *Added : event ONNOTIFYBALLOONCLICK to control WINDOW
     *Added : property  AUTOSIZE   to control CHECKBOX
     *Added : event:  ON ENTER to control CHECKBOX
     *Added : event:   ON CHECKBOXCLICKED  to control GRID
     *Added : properties VALIDMESSAGES NOSORTHEADERS LOCKCOLUMNS PAINTDOUBLEBUFFER to control GRID
     *Added : property  PAINTDOUBLEBUFFER to control BROWSE
     *Added : property  BORDER to control TEXTBOX
     *Added : properties PAINTDOUBLEBUFFER  BREAK to control BROWSE
     *Fixed : eliminated properties INPUTMASK FORMAT in control BROWSE
     *Added : properties CUSTOMIZE WRAP to control TOOLBAREX
     *Added : property PROGRESSITEM to control STATUSBAR
     *Added : properties RANGE VALUE BACKCOLOR FONTCOLOR to control STATUSBAR
     *Added : show the toolbar created on form main window
     Contributed by Walter Formigoni <walter.formigoni@uol.com.br>

This version is considered as a Beta release.

Note: You can update this build via clicking 'Update' menu item in the main menu 'Help'.

--
Kind Regards,
Grigory Filatov
[MiniGUI Team]

Harbour Documentation Site by José Quintas

You may want to check out this Brazilian Site by

http://www.harbourdoc.com.br/

Harbour MiniGUI Extended Edition 2.3.7 is published

Hi All,

Harbour MiniGUI Extended Edition 2.3.7 setup is published at the following URL:

http://hmgextended.com/files/CONTRIB/hmg-2.3.7-setup.zip

and a MinGW-based self-extracting archive is placed at the following URL:

http://hmgextended.com/files/CONTRIB/hmg237-mingw.exe

There are also an optional xHarbour-based archive at the following URL:

http://hmgextended.com/files/CONTRIB/xhmg237_xhb10003.zip

and donationware xCC-based self-extracting archive for xHarbour.com distribution at

http://hmgextended.com/files/CONTRIB/hmg237-xcc.exe

There is the following changelog for this build:

2014/07/09: HMG Extended Edition 2.3.7 Published.
* Fixed: Correction in the function _GetFocusedControl() for ComboBox control
with DisplayEdit clause and ComboBoxEx control.
Problem was reported at official HMG forum.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
* Enhanced: 'ThisWindow' object reference may be used inside a structure
DEFINE WINDOW ... END WINDOW.
Sample code:
DEFINE WINDOW Win_1 TITLE 'Hello World!' WINDOWTYPE MAIN
This.Sizable := .F.
This.MaxButton := .F.
This.MinButton := .F.
END WINDOW
Contributed by Russian user SergKis
(see demo2.prg in folder \samples\Basic\ExtractIcon)
* Changed: Function InkeyGUI([])-->VKey was moved to MiniGUI core.
Contributed by Russian user SergKis
(see demo2.prg in folder \samples\Basic\WAIT_WINDOW)
* Enhanced: The ButtonEx control supports an optional HANDCURSOR clause and
'ON MOUSEHOVER' and 'ON MOUSELEAVE' events.
Using of above events allow dynamically change a button's look at
a mouse hover and got focus after arrows keys pressing.
Requested by Verchenko Andrey <verchenkoag@gmail.com>.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see cpanel_2.prg in folder \samples\Advanced\CONTROL_PANEL and
menulist_2.prg in folder \samples\Advanced\MenuList)
* Enhanced: HOTTRACK clause have used for highlighting of selected Tab page
at an owner-draw colored TAB. It is an experimental feature.
Requested by Eduardo Piazza <e.p@ergosoftware.it>.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo.prg in folder \samples\Basic\TAB)
* Updated: Header file i_hmgcompat.ch for compatibility with Official HMG:
- added pseudo-functions IsValidWindowHandle() and IsMinimized().
Contributed by Grigory Filatov <gfilatov@inbox.ru>
* Updated: Config file of hbmk2 utility: revised description of needed libs.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see minigui.hbc in folder \harbour\bin)
* Updated: HBPrinter library v.2.37:
- Fixed: Brush and pen not working when printing a rounded rectangle.
- New: Added command SET COPIES [TO]
Requested by Vianei Moreira de Lemos <vianeimoreira@gmail.com>.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Basic\HBPrinter)
* Updated: PropGrid library source code:
- Changed: Optional clause ITEMDATA for item type STRING to execute
InputMask in form Control TextBox.
Contributed by Janusz Pora <januszpora@onet.eu>
* Updated: HbXml library source code (see in folder \Source\HbXML).
Borrowed from HwGui v2.18 by Alexander Kresin <alex@kresin.ru>.
Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Advanced\XMLDEMO)
* Updated: Harbour Compiler 3.2.0dev (r2014-06-26 18:42).
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(look at ReadMe.txt in folder \harbour)
* New: 'Grid Row Height workaround' sample.
Based upon a contribution of S.Rathinagiri <srgiri@dataone.in>
(see in folder \samples\Basic\Grid_RowHeight)
* New: 'Control Panel with ButtonEx' sample.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see in folder \samples\Advanced\CONTROL_PANEL)
* New: 'Menu List with ButtonEx' sample.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see in folder \samples\Advanced\MenuList)
* New: 'External Application Control' sample.
Based upon a contribution of Claudio Soto <srvet@adinet.com.uy>.
Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
(see demos in folder \samples\Advanced\ExternalApp_2)
Warning: This example don't work properly at 64-bit version of Windows.
* New: 'Sqlite browser' utility.
Contributed by Janusz Pora <januszpora@onet.eu>.
Revised by Grigory Filatov <gfilatov@inbox.ru>
(see in folder \Utils\SqlDBU)
* Updated: 'Example assembled from three parts (modules)' sample.
Contributed by Verchenko Andrey <verchenkoag@gmail.com>
(see in folder \samples\Basic\SPLASHDEMO_3)
* Updated: 'Method AddPage, AddControl and BackColor in TAB' sample.
Based upon a contribution of Daniel Maximiliano.
Revised by Grigory Filatov <gfilatov@inbox.ru>
(see in folder \samples\Basic\Tab_2)

There is also a following "last minute" change in this build:
* Updated: Adaptation FiveWin Class TSBrowse 9.0 in HMG:
- Changed: Minor correction in the method SortArray().
Contributed by Igor Nazarov.

It is a regularly scheduled maintenance release.

This release is considered stable and ready for production use.

--
With Best Regards,
Grigory Filatov
[MiniGUI Team]


P.S. Thank you very much to ALL donators of this project!
This release would not have been possible without your support.

Harbour MiniGUI Extended Edition 2.3.6 Released on 14 June 2014

Hi All,

Harbour MiniGUI Extended Edition 2.3.6 setup is published at the following URL:

http://hmgextended.com/files/CONTRIB/hmg-2.3.6-setup.zip

and a MinGW-based self-extracting archive is placed at the following URL:

http://hmgextended.com/files/CONTRIB/hmg236-mingw.exe

There are also an optional xHarbour-based archive at the following URL:

http://hmgextended.com/files/CONTRIB/xhmg236_xhb10002.zip

and donationware xCC-based self-extracting archive for xHarbour.com distribution at

http://hmgextended.com/files/CONTRIB/hmg236-xcc.exe

There is the following changelog for this build:

2014/06/11: HMG Extended Edition 2.3.6 Published.
* Changed: The C-functions SetArrowCursor() and SetWaitCursor() are
defined as pseudo-functions.
They are a wrappers for the C-function SetWindowCursor().
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Basic\CURSOR)
* Changed: The internal C-function ReleaseControl() is defined as pseudo-function.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
* Modified: The C-function GetWindowRect() supports a second parameter as numeric value.
Syntax:
nRet := GetWindowRect( hWnd, /*@*/ aPos | nSwitch ),
where nSwitch have the following values:
1 - function returns Window Row of specified handle hWnd;
2 - function returns Window Column of specified handle hWnd;
3 - function returns Window Width of specified handle hWnd;
4 - function returns Window Height of specified handle hWnd.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Basic\DropDown)
* Changed: The C-functions GetWindowRow(), GetWindowCol(), GetWindowWidth() and
GetWindowHeight() are defined as pseudo-functions.
They are a wrappers for the updated C-function GetWindowRect().
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Basic\FormStorage)
* Updated: MiniPrint library (see source in folder \Source\MiniPrint):
- Updated: Unified definition of hotkeys in the three forms.
Borrowed from HMG official version 3.3
(see demo in folder \samples\Basic\miniprint)
* Updated: 'Bos Taurus' Graphics Library (see source in folder \Source\BosTaurus).
Based upon a contribution of Claudio Soto <srvet@adinet.com.uy>.
Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
(see demos in folder \samples\Advanced\BosTaurus)
* Updated: HbXml library source code (see in folder \Source\HbXML).
Borrowed from HwGui v2.18 by Alexander Kresin <alex@kresin.ru>.
Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Advanced\XMLDEMO)
* Updated: HbSQLite3 library:
- update for using SQLITE3 version 3.8.5 (from 3.8.5dev).
Upgrading from the previous version is recommended.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo in folder \samples\Advanced\SQLITE_2)
* Updated: Harbour Compiler 3.2.0dev (r2014-05-23 17:01).
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(look at ReadMe.txt in folder \harbour)
* New: 'MiniPrint Demo' sample. Borrowed from HMG 4 project.
Adapted for Minigui Extended by Grigory Filatov <gfilatov@inbox.ru>
(see demo2.prg in folder \samples\Basic\miniprint)
* New: 'Usage of FreeImage DLL for images from file and resource' sample.
This sample is required a library FreeImage.Dll from http://freeimage.sourceforge.net
Based upon a contribution of Vladimir Chumachenko <ChVolodymyr@yandex.ru>
(see in folder \samples\Advanced\FreeImage_2)
* Updated: 'Charts ADO' sample: minor change.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see in folder \samples\Basic\Charts)
* Updated: 'ToolBar container' sample:
- Fixed: Windows problem of overlap between ToolBar Bottom and StatusBar.
Contributed by Grigory Filatov <gfilatov@inbox.ru>
(see demo1.prg in folder \samples\Basic\CONTAINERS\TOOLBAR)

It is a regularly scheduled maintenance release.

This release is considered stable and ready for production use.

--
With Best Regards,
Grigory Filatov
[MiniGUI Team]

QtContribs - Harbour Qt Projects

Welcome to the new chapter in Harbour's history: Harbour Qt Projects.

So far all the contribution libraries were hosted in Harbour project's repository. This is the first time a part of it has been pulled and hosted outside. To make sure that end-user is not affected by this split, the folder structure of this repository has been kept the same as that of Harbour's. The same make system and the same build targets have been achieved.

As the name suggests, Qt related projects, viz., HbQt, HbXBP and HbIDE have been transferred here.

The goal of this project is be the satellite of Harbour Project, and not an independent project. This project will try to honor the high standards set forth by Harbour. It will encourage the developers to write code in such a way that Harbour could adopt and absorb inside its own repository, if the administrators deem fit.

This project will never attempt to develop its own build system and will ever rely on Harbour's native one. So if Harbour happens to make changes then maintainers of Harbour will be requested to update the same here also. As of now I have near zero understanding of Harbour's make system, and if that breaks for some reason, I will find it helpless to set it right for this project.

Everybody is encouraged to contribute to this repository. Do not be afraid of your creativity level, just have a willingness to contribute, respect Harbour's coding high standards, and send it here. Your small contribution will make HbQt bindings extremely rich.

In this repository we do not have, at times, hypothetical constraints. But it does not mean that we have to drift away from standards set forth by Harbour. We have to remain careful about the acceptability of our codebase. Constraints can be overlooked if changes do not harm the portability issues if a piece of code is supposed to be portable.

So, do join us...

Pritpal Bedi
a student of software analysis & concepts

More at  http://sourceforge.net/projects/qtcontribs/

Locking schemes used with DBF files by Przemyslaw Czerpak

Locking schemes used with DBF files.
Przemyslaw Czerpak (druzus/at/poczta.onet.pl)


Exclusive/shared modes (DENY READ, DENY WRITE) in POSIX systems.
================================================================

Exclusive modes (DENY READ, DENY WRITE) do not exist in POSIX systems.
They can be emulated by fcntl() or flock() locks. Harbour uses flock()
in systems where it does not create conflicts with fcntl() locks used
to synchronize file access by different processes in shared mode.
Currently it's enabled by default only in Linux (tests with *BSD systems
and MacOSX showed that it interacts with fcntl locks causing deadlocks).
On other POSIX systems Harbour uses fcntl() read and write locks at
address 0x7fffffff (size 1) to simulate shared and exclusive mode.

CLIP and FlagShip use fcntl() locks to simulate shared/exclusive modes.
CLIP shared/exclusive flag:     0x7fffffff : 1 (the same as Harbour)
FlagShip shared/exclusive flag: 0x7ffffbfc : 1




File access synchronization (record and file locking) in shared mode.
=====================================================================

FlagShip uses different record and index locking schemes
(i.e. for RLOCK it locks record area) and it is not described
here.


In documentation CLIP can use Clipper like or FoxPro like locking
schemes and it can be controlled by SET LOCKSTYLE [TO] ... command
or Set( _SET_LOCKSTYLE, 0 | 1 ) function.
This switch only changes the RLOCK/FLOCK offset.
For:
   SET LOCKSTYLE [TO] CLIPPER | CLIPPER50 | CLIPPER53
or:
   Set( _SET_LOCKSTYLE, 0 )
this offset is set to 1'000'000'000. This is header lock address
and records are locked at above address + record number.
This is compatible with standard Clipper locking.
Commands:
   SET LOCKSTYLE [TO] CLIPPER52 | FOXPRO | SIX
or:
   Set( _SET_LOCKSTYLE, 1 )
set this offset to 0x10000000 keeping the same algorithm
for record locking what is incompatible with any other locking
schemes known by me. For sure it's not compatible with [V]FP
locking (see details about this locking scheme below).
For more information look at CLIP source code.




(*) In Harbour index read locks are shared on platforms which support
    shared (read) locks.

Clipper DBFNTX locking:
=======================
all locks are exclusive (*)
DBF HEADER LOCK: @1000000000 : 1 (exclusive)
DBF RECORD LOCK: @1000000000 + recNO : 1 (exclusive)
DBF FLOCK SIZE:  1000000000
   => maximum records: 3'294'967'295
      maximum file size in non POSIX systems: 1'000'000'000

NTX READ LOCK:   @1000000000 : 1 (exclusive)
NTX WRITE LOCK:  @1000000000 : 1 (exclusive)

In Harbour it's DB_DBFLOCK_CLIPPER.


Clipper new DBFNTX locking (ntxlock2.obj):
==========================================
all locks are exclusive (*)
DBF HEADER LOCK: @4000000000 : 1 (exclusive)
DBF RECORD LOCK: @4000000000 + recNO : 1 (exclusive)
DBF FLOCK SIZE:  294967295
   => maximum records: 294'967'295
      maximum file size in non POSIX systems: 4'000'000'000

NTX READ LOCK:   @1000000000 : 1 (exclusive)
NTX WRITE LOCK:  @1000000000 : 1 (exclusive)

In Harbour it's DB_DBFLOCK_CLIPPER2.


CL52 DBFCDX, SIX3 SIXCDX, SIX3 SIXNSX, [V]FP CDX
================================================
all locks are exclusive (*)
when there is no structural index:
DBF HEADER LOCK: @0x40000000 : 1
DBF RECORD LOCK: @0x40000000 + record offset : 1 (some implementations
                                                  locks whole record)
DBF FLOCK SIZE:  0x3ffffffd
   => maximum file size: 1'073'741'823

when structural index is open:
DBF HEADER LOCK: @0x7ffffffe : 1
DBF RECORD LOCK: @0x7ffffffe - recNO : 1
DBF FLOCK SIZE:  0x07ffffff
   => maximum records: 134'217'727
      maximum file size in non POSIX systems: 2'013'265'919

index file locking is the same for production and normal indexes:
CDX READ LOCK:   @0x7ffffffe : 1
CDX WRITE LOCK:  @0x7ffffffe : 1

In Harbour it's DB_DBFLOCK_VFP.


CL53 DBFCDX, COMIX (hyper locking)
==================================
all locks are exclusive (*), in index shared locks are emulated

DBF HEADER LOCK: @1000000000 : 1
DBF RECORD LOCK: @1000000000 + recNO : 1
DBF FLOCK SIZE:  1000000000
   => maximum records: 1'000'000'000
      maximum file size in non POSIX systems: 1'000'000'000

CDX READ LOCK:   @0xffff0000 + random value from 0x0 to 0xffff : 1
CDX WRITE LOCK:  @0xfffeffff : 0x10001
    if fail then @0xfffeffff : 1
    prepare the index modification in memory and before writing to
    index file lock @0xffff0000 : 0x10000
  to eliminate starvation effect caused by many readers
  on each 16-th read lock reading process tries to lock write
  area @0xfffeffff : 1 instead and then sets normal read lock

In Harbour it's DB_DBFLOCK_COMIX.


HARBOUR 32-bit locking
======================
all locks are exclusive (*), in index shared locks are emulated

DBF HEADER LOCK: @4000000000 : 1 (exclusive)
DBF RECORD LOCK: @4000000000 + recNO : 1 (exclusive)
DBF FLOCK SIZE:  294967295
   => maximum records: 294'967'295
      maximum file size in non POSIX systems: 4'000'000'000

CDX READ LOCK:   @0xffff0000 + random value from 0x0 to 0xffff : 1
CDX WRITE LOCK:  @0xfffeffff : 0x10001
    if fail then @0xfffeffff : 1
    prepare the index modification in memory and before writing to
    index file lock @0xffff0000 : 0x10000
  to eliminate starvation effect caused by many readers
  on each 16-th read lock reading process tries to lock write
  area @0xfffeffff : 1 instead and then sets normal read lock

In Harbour it's DB_DBFLOCK_HB32.


HARBOUR 64-bit locking
======================
all locks are exclusive (*), in index shared locks are emulated

DBF HEADER LOCK: @0x7fffffff00000001 : 1
DBF RECORD LOCK: @0x7fffffff00000001 + recNO : 1
DBF FLOCK SIZE:  0xfffffffeUL
   => maximum records: 4'294'967'294
      maximum file size: no limits created by locks

CDX READ LOCK:   @0x7fffffff00000000 + random value from 0x1 to 0xffff : 1
CDX WRITE LOCK:  @0x7fffffff00000000 : 0x10001
    if fail then @0x7fffffff00000000 : 1
    prepare the index modification in memory and before writing to
    index file lock @0x7fffffff00000001 : 0x10000
  to eliminate starvation effect caused by many readers
  on each 16-th read lock reading process tries to lock write
  area @0x7fffffff00000000 : 1 instead and then sets normal read lock

In Harbour it's DB_DBFLOCK_HB64.