Answer / sravan reddy

mission critical system is a hard real time system. failure
of some tasks lead to a disaster or catastrophic results occur.
mission critical systems are/must be time specific and more
deterministic and predictable,every task has a critical time
associated and must be completed within that time..
there is a watch dog timer in a real time system which
estimates the time for every task being executed.
when the task is not completed within that time they are
forcefully removed out of running state..

Answer / kwrtos

Besides its life/death or make/break ingredients of
operational procedures or processes, that is what the most
mission critical systems have themselves labeled, a mission
critical system is the system that has to acomplish certain
critical tasks within a predefined duration of time and/or a
predefined frame of benchmarks. The time constraint and the
benchmarks are the integral part of the mission. Without the
meeting such those constraints, the consequence of failure
often thoroughly defeats the purpose of the entire system.

Answer / y.s.modi

mission critical system determines that each process within
program must be completed its execution within specified
time period.if any process takes more time in execution it
will be forced to stop its execution immediately.

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 Answers  

---

what is major concerns about any RTOS selection ?

4 Answers   Bosch,

---

If two processes which shares same system memory and system clock in a distributed system, What is it called?

7 Answers  

---

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?

8 Answers   Bosch, Emulogic, L&T, Qualcomm,

---

Describe different job scheduling in operating systems.

9 Answers  

---

what is difference between IRQ and FRQ ?

4 Answers   Bosch,

---

what are the rules u follow when u r writing critical section of code?

6 Answers   TCS,

---

When would you choose bottom up methodology?

5 Answers   Knowx Innovations,

---

What is a mission critical system ?

3 Answers  

---

what is the need of creating 4GB of pages in linux?

1 Answers   TCS,

---

What do you mean by deadlock?

8 Answers   Bosch,

---

Write a small dc shell script to find number of FF in the design

0 Answers  

---