Multimedia Developer Interview Questions


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Multimedia Driver Software Engineering was asked...28 June 2012

Explain a situation where a deadlock would occur.

3 Answers

Two processes each holding a resource tries to access the other's resource.

Or you could forget to unlock.

There are 4 conditions from Coffman's: A deadlock situation can arise if all of the following conditions hold simultaneously in a system:[1] 1. Mutual Exclusion: At least two resource must be non-shareable.[1] Only one process can use the resource at any given instant of time. 2. Hold and Wait or Resource Holding: A process is currently holding at least one resource and requesting additional resources which are being held by other processes. 3. No Preemption: The operating system must not de-allocate resources once they have been allocated; they must be released by the holding process voluntarily. 4. Circular Wait: A process must be waiting for a resource which is being held by another process, which in turn is waiting for the first process to release the resource. In general, there is a set of waiting processes, P = {P1, P2, ..., PN}, such that P1 is waiting for a resource held by P2, P2 is waiting for a resource held by P3 and so on until PN is waiting for a resource held by P1.[1][7] Less


What is the problem with the following code. __interrupt double compute_area(double radius) { { double area = PI * radius * radius; printf(“\nArea = %f”, area); return area; }

2 Answers

printf is a blocking routine. It **must** not be used in an ISR. Consider the case then an interrupt arrived and this ISR is invoked and stdout is blocked by some other task. This code will give you nightmare bugs which are almost impossible to debug Less

How will you declare the following: (a) A pointer to an integer: (b) A pointer to a pointer to an integer: (c) An array of ten integers: (d) An array of ten pointers to integers: (e) A pointer to an array of ten integers (f) A pointer to a function that takes an integer as an argument and returns an integer Less


Memory mapping in registers. Based on paging, where page size was fixed. Basically you know the memory size and the start address, you have to return the pages coming in that range. This is what I understood after a lot of thinking. The interviewer was not very clear about it

2 Answers

Basically, what I told was, since you know where to start and the length of the memory to be mapped, you basically need to know on which page it starts (0,1,2) and which page the mapping ends(depending on the length) and then when you know that you can return those pages. I could answer only through a pseudo code, where I used the idea of using the page size as the divisor and use the addresses to find the on which page they lied. The interviewer didn't approve of that (as they were pseudo codes) and that the division operations were not efficient (Agreed). I asked him what the correct answer was, he wrote something hurriedly, related to bit-shifting (which is division done efficiently). If somebody knows the standard question and answer please post it. Less

When a page size is fixed (usually a power of 2) you can take that many bits out of the lower order bits in the memory to be mapped to figure out what the offset within a page is. And the remaining bits would tell you the page number. Less

Delex Systems

Asked about development experience, and aptitude to use notepad instead of dream-weaver for web design/development. I answered truthfully, and was seen as a compatible employee based on my aptitude to learn, and my degree field

1 Answers

basically that I had the ability to learn, but had not made practice of raw coding in notepad, but had used a WYSWYG editor in the past (school) Less


Difference between I'd and class in css.

1 Answers

Refer w3 school.

Rentokil Initial

All about my field and skills

1 Answers



Have I every worked in aerospace

1 Answers


eLearning Brothers

We don't really want ideas. We want "wrench turners." Can you do that?

1 Answers

Um. Where is the door?

Pepperdine University

Why do you think we want to choose you instead of others.

1 Answers

I can fit in to your culture.


The lack of personal contact made for a very awkward interview for all the questions.

1 Answers

I found answering the questions difficult because you can not read another person and feel their energy towards your answers. Less

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