VXWORKS INTERVIEW QUESTIONS ANSWERS PDF

Post a Comment. What is the memory layout in Vx Works? VxWorks runs in one mode. No protected vs.

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These interview questions and answers on VxWorks will help you strengthen your technical skills, prepare for the interviews and quickly revise the concepts. So get preparation for the VxWorks job interview. The VxWorks multitasking kernel, wind, uses interrupt-driven, priority-based task scheduling. It features fast context switch times and low interrupt latency.

Under VxWorks, any subroutine can be spawned as a separate task, with its own context and stack. Other basic task control facilities allow tasks to be suspended, resumed, deleted, delayed, and moved in priority. Is This Answer Correct? In case of high end processors the interrupt table will decide the interrupt vector address and whenever intterrupt pin goes low, the table is searched for type and source of interrupt.

Both gets memory allocated from the data segment. Then how does the visiblity of static global varible gets limited to the file alone in which it gets declared Static variables are local in scope to their module in which they are defined, but life is throughout the program.

Say for a static variable inside a function cannot be called from outside the function because it's not in scope but is alive and exists in memory.

The next time this function is entered within the same program the same chunk of memory would be accessed now retaining the variables old value and no new memory is allocated this time for this variable like other variables in the function automatic variables. So basically the variable persists throughout the program. Similarly if a static variable is defined in a global space say at beginning of file then this variable will be accessible only in this file file scope.

Why other scheduling methods are supported by such Oses? The standard UNIX kernel is a nonpreemptive kernel; it does not allow a user process to preempt a process executing in kernel mode. Once a running process issues a system call and enters kernel mode, preemptive context switches are disabled until the system call is completed.

Although there are context switches, a system call may take an arbitrarily long time to execute without voluntarily giving up the processor. During that time, the process that made the system call may delay the execution of a higher-priority, runnable, realtime process.

The maximum process preemption latency for a nonpreemptive kernel is the maximum amount of time it can take for the running, kernel-mode process to switch out of kernel mode back into user mode and then be preempted by a higher-priority process. Under these conditions it is not unusual for worst-case preemption to take seconds, which is clearly unacceptable for many realtime applications. Instead of taskspawn taskInit and taskActivate can be used to create task.

Priority Inheritance is the solution for priority inversion. The instance it unlocks the resource the prioity is changed to its original value. Another solution for this is priority ceiling where you inherit the priority of the lower task whenever a higher task is created.

Even if the higher priority task doesnot request for the resource. Priority inversion is a situation where in lower priority tasks will run blocking higher priority tasks waiting for resource mutex. For ex: consider 3 tasks. A, B and C, A being highest priority task and C is lowest. C was ready to run. So C starts running. Swaps out C and takes mutex. A is ready to run. The solution to priority inversion is Priority inheritance.

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VxWorks Interview Questions & Answers

These interview questions and answers on VxWorks will help you strengthen your technical skills, prepare for the interviews and quickly revise the concepts. So get preparation for the VxWorks job interview. The VxWorks multitasking kernel, wind, uses interrupt-driven, priority-based task scheduling. It features fast context switch times and low interrupt latency. Under VxWorks, any subroutine can be spawned as a separate task, with its own context and stack. Other basic task control facilities allow tasks to be suspended, resumed, deleted, delayed, and moved in priority.

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