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For ERP LN feature pack upgrade, what method of install are you using?
Installation Wizard into existing VRC
35%
Installation Wizard into new VRC
42%
Manual into existing VRC
3%
Manual into new VRC
19%
Total votes: 31

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Document Information
By patvdv at 26 Feb 2008 - 21:57

A publication of

Baan Development B.V.
P.O.Box 143
3770 AC Barneveld
The Netherlands
© Baan Development B.V. 2003
All rights reserved.
The information in this document is subject to change without notice. No part of this document may be reproduced, stored or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of Baan Development B.V.

4.666665
Average: 4.7 (3 votes)

Bshell scheduler
By patvdv at 26 Feb 2008 - 21:57

Bshell scheduler

The bshell scheduler is responsible for managing and scheduling processes. It maintains four process queues, as follows:

  • running queue
  • blocking queue
  • sleeping queue
  • terminating queue

The scheduler keeps all processes in one or other of the above process queues, depending on their current state.

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Context switches
By patvdv at 26 Feb 2008 - 21:57


Context switches

Each running process receives a number of ticks when it is scheduled. This is the equivalent of a UNIX time slice. The execution of each instruction costs the process a number of ticks. When the process has used up all its ticks, the bshell schedules another process. The switch to another process is referred to as a context switch.

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Events
By patvdv at 26 Feb 2008 - 21:57

Events

BaanERP programs are designed to respond to events. Usually, they consist of a main loop that waits for events to occur. When an event occurs, the program performs the appropriate actions to process the event. It then returns to its waiting state.

Event types

There are four broad categories of events, as listed below. For a full list of event types, see Event types.

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Multitasking and the GUI
By patvdv at 26 Feb 2008 - 21:57

Multitasking and the GUI

The BAAN bshell provides the execution environment for BAAN applications. Whenever a user logs on to the BAAN system, a separate bshell process is activated for that user. So, when multiple users log on to the same BAAN system, or when the same user logs on multiple times, multiple bshell processes are activated on the execution platform.

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Processes, process groups, and main windows
By patvdv at 26 Feb 2008 - 21:57

Processes, process groups, and main windows

Processes

A process consists of a program object, a date, and a state. A process that has been started can be in any one of the following states:

  • Running.
    The process is in the running queue. It has been scheduled to run, or is ready to be scheduled.
  • Blocking.
    The process is in the blocking queue. It is waiting for input.

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Requests, inquiries, and replies
By patvdv at 26 Feb 2008 - 21:57

Requests, inquiries, and replies

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Synchronizing processes with the wait() function
By patvdv at 26 Feb 2008 - 21:57

Synchronizing processes with the wait() function

The wait() function enables synchronization of parent and child processes. It causes the parent process to wait for one or all of its children to exit before continuing. Each child process sends an exit signal to the parent process when it ends.
The parent can choose to ignore child signals or not. If it wants to ignore child signals, the parent process calls:

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Expanding text variables
By patvdv at 26 Feb 2008 - 21:57

Expanding text variables

Variables or expressions that are included in text lines can be expanded or substituted for report purposes. You must set the variable lattr.textexpand=TRUE if you want this to happen. Expressions are internally evaluated by the function expr.compile().

3
Average: 3 (1 vote)

Report script functions
By patvdv at 26 Feb 2008 - 21:57

Report script functions

The statements programmed in a report script section consist of a combination of 3GL languagestatements and the following 4GL report functions:

layout.again()

Evaluate and print layout again.

need( expr )

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