GeeksforGeeks

what is shared library?
With small c program implement Dll?

. How many processes are created in this snippet?
Main()
{
Fork();
Fork() && fork () || fork ();
Fork ();
}

a. 15
b. 19
c. 21
d. 27
e. 31

I'm doing my homework and I've already found out some things about synchronisation issues but if anyone could tell me in a little more detail why synchronisation between different processes belonging to the same or different programs is an important task in parallel computing?

Thanks in advance! x

file which has maximum link in the unix file system?

Please answer following questions.
1) In PCB where will be SP and PC?
2) After termination of the process whether PCB is deleted are not? Can OS kernel can assign terminated PID to new Process?
3) How come parents come to know who are all its child, and how child will come to know the parent?
4) Maximum for a parent how many child you can create?
5) Where the kernel will give space to PCB?
6) What is difference between Zombie process and daemon process?

if we consider a page existing in memory then on a CPU cache miss ,for co-processors sharing multiple levels of caching (not involving there local caches) what is the exact procedure to avail that page to CPU?
1. the page has to travel up through all shared level caches and then made available to CPU or
2. page from main memory directly goes to local cache and then cache levels are updated

if we consider a page existing in memory then on a CPU cache miss ,for co-processors sharing multiple levels of caching (not involving there local caches) what is the exact procedure to avail that page to CPU?
1. the page has to travel up through all shared level caches and then made available to CPU or
2. page from main memory directly goes to local cache and then cache levels are updated

one system API available setOStimer(time n, function ptr, function arg)
it sets time for n sec. after expiration of timer it calls function.
if another timer set with setOStimer, it will erase previously sets timer.
Ex. at t = 0, setOStimer(5,fn,arg)
at t = 4, setOStimer(10,fn1,arg1)
now first timer removed.
Question is using this API, write own API setTimer(), it will use given API. So that it will not erase previously set timer.

Is page table per Process ? or KERNEL maintain entire single shared page table for all process ?

How to find out whether machine is 32 bit or 64 bit?

Write a code that will check whethere the memory allotted to the program at the initial and the memory returned to the system is same or not.

I have two threads that work independently, at some point they need to be wake up by OS for read two handle two different callbacks. I have one poll() inside each thread (POLLIN ) to handle the callbacks. This is causing in a racing since OS will only sends the wake up call no matter what is the callback type to be handled. Your help is highly appreciated. I am really new in this area.

Can two different processes share a thread. Illustrate with example

Can somebody explain about the difference between these snynchronisation technichqe

What are the similarities and differences between concurrency mechanisms of windows vista and linux?

when we define process as " combination of address space and a thread of control" , what do we mean by thread of control? How is this "thread of control" implemented in kernel ?

There are two CPUS CPU1 and CPU2. Both these CPUs are bare bones, have only one task that is to loop around a common piece of code(which is located in some share mem accessible by both)

Now there are some critical sections in the common peice of code. How can you protect these critical sections without using any of the known synchronization primitives.

Disabling preemption is already ruled out. because the CPUS are so bare bones.