Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Executing One process alone in the PC.

Posted on 1999-01-21
6
156 Views
Last Modified: 2010-04-02
Some form exists to execute a alone program in the PC, stopping all the other processes of sistema(screen rest, TSR...)
0
Comment
Question by:rosch
  • 4
  • 2
6 Comments
 
LVL 22

Accepted Solution

by:
nietod earned 50 total points
ID: 1184722
You can dissable hardware interrupts for short periods of time.  that would allow you to prevent a TSR from taking over or would prevent a memory refresh from occuring.  You can so this only for a fraction of a second however, before you must enable interrupts again or the computer will die.  Is this what you are talking about?
0
 
LVL 22

Expert Comment

by:nietod
ID: 1184723
From C++ you could do
__asm CLI

to prevent interrupts and do

__asm STI

to enable interrupts.
0
 

Author Comment

by:rosch
ID: 1184724
This dissable of interruptions will function for the processes in the WIN95? I am using Visual Microsoft Studio 5.0
0
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 22

Expert Comment

by:nietod
ID: 1184725
>> This dissable of interruptions will function for the processes in the WIN95?
Not a chance.  These instructions will fail in protected mode (use of them will cause a general protection fault), since they would allow a program to crash the system if used incorrectly.  

However 16 bit program will still be allowed to use them (which is one of many reasons why 16 bit programs can crash the system).  This is about your only recourse.  The OS isn't going to provide any way for you to have exclusive use of the CPU and is designed to stop any attempt you make.  

Perhaps there is another way, like a high (realtime) thread priority, What are are you doing that you need this for?
0
 

Author Comment

by:rosch
ID: 1184726
>> Perhaps there is another way, like a high (realtime) thread priority, What are are you doing that you need this for?
 Yes.
How? I make VxD ring 0?
0
 
LVL 22

Expert Comment

by:nietod
ID: 1184727
you can use SetPriorityClass() to set the thread's priority class to REALTIME_PRIORITY_CLASS and you can use SetThreadPriority() to set the priority to THREAD_PRIOROITY_TIME_CITICAL.  This does not guarantee that you get all the CPU time, but it comes close.  However, you can only do this for short periods of time or you could crash the system.

A device driver can use the STI and CLI instructions.  This pretty much insures complete CPU access.  I don't know if a VxD can use those instructions though.  
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question