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Executing One process alone in the PC.

Posted on 1999-01-21
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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...)
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Question by:rosch
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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?
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by:nietod
ID: 1184723
From C++ you could do
__asm CLI

to prevent interrupts and do

__asm STI

to enable interrupts.
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by:rosch
ID: 1184724
This dissable of interruptions will function for the processes in the WIN95? I am using Visual Microsoft Studio 5.0
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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?
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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?
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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.  
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