:: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Categories >> Software >> Operating Systems >> RTOS >> RTOS AllOther


 Vxworks interview questions  Vxworks Interview Questions (11)
 Windows CE interview questions  Windows CE Interview Questions (12)
 RTOS AllOther interview questions  RTOS AllOther Interview Questions (20)
what is major concerns about any RTOS selection ?
 Question Submitted By :: RTOS-AllOther
I also faced this Question!!     Answer Posted By  
# 1
There are two major reson to consider before selecting any RTOS

1) Interuppt latency
2) Footprint (size of the executable which is generated
after compiling)
3) Context switching time is also considered as vital
element in selection
Is This Answer Correct ?    33 Yes 4 No
# 2
Interrrupt Latency means the time taken by the processor to
pass the control to ISR after the interrupt is raised.
Certainly this is the hardware feature.

Footprint of the OS matters because with the same compiler
and same optimization techniques, Different OS's will have
different footprint.
So this is can be looked upon while selecting the RTOS.

RTOS can be chosen looking at various API support it
provides. Synchronization support, Scheduler algos, and
memory management of the OS.
Is This Answer Correct ?    15 Yes 2 No
# 3
(1) Interrupt latency means, the time taken by the processor
to service the interrupt. So, obviously the interrupt
latency depends on how good the Interrupt Service Routine
was written

(2) Foot print is completely related to compiler and its
optimization techniques
Is This Answer Correct ?    17 Yes 7 No
# 4
First thing i will look for open source RTOS, so that i can
modify it as per my application requirements. Further, it
will help in debugging software with confidence.

Context switching time is again in programmers hand(i.e.OS
porting work).
Is This Answer Correct ?    1 Yes 0 No

Other RTOS AllOther Interview Questions
  Question Asked @ Answers
What is priority inversion ? and What is the solution ? Qualcomm 6
What is the important aspect of a real-time system ?   6
What do you mean by deadlock?   8
what are the rules u follow when u r writing critical section of code? TCS 6
what is the need of creating 4GB of pages in linux? TCS 1
Explain the difference between microkernel and macro kernel. Infosys 5
what is difference between IRQ and FRQ ? Bosch 4
I have been working on one thread which manage and control a couple of circular buffers. It has api for other thread to access. As the thread grows bigger and bigger, I split it as 3 to 4 threads which need to share common buffers, and also their api could be used by other threads, (not these three threads). Inside api, I also allow other threads to access these three threads' common buffers(more than one buffer). SO I have to use mutex to avoid race condition . But I found mutex will be everwhere in all the threads when they update the common buffer. I am wondering whether I could reduce mutex usage(more mutex will hure my system performance). any ideas for how to reduce mutex usage meanwhile to avoid race condition. Thanks   2
What is a Real-Time System ?   5
When would you choose bottom up methodology? Knowx-Innovations 5
Give an example of microkernel. Samsung 13
What is the difference b/n any GPOS and RTOS?Give suitable examples or characteristic of RTOS to support your answer. What changes can be done in a GPOS to make it work like a RTOS? What basic features will you support, if you have to design a RTOS? Emulogic 7
For more RTOS AllOther Interview Questions Click Here 

Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
Copyright 2013  All Rights Reserved.   ::