Operating System MCQs

How many times the following C program prints yes? main() { fork();fork();printf("yes"); }

Which of the following calls never returns an error?

A fork system call will fail if ______________

If exec is called immediately after forking ____________

If a process does not call exec after forking ____________

What is Thread cancellation?

When a web page is loading, and the user presses a button on the browser to stop loading the page?

When one thread immediately terminates the target thread, it is called ____________

When the target thread periodically checks if it should terminate and terminates itself in an orderly manner, it is called?

Cancelling a thread asynchronously ____________

Cancellation point is the point where ____________

Signals that occur at the same time, are presented to the process ____________

Which of the following is not TRUE?

Signals of a given type ____________

The three ways in which a process responds to a signal are ____________

Signals are identified by ____________

When a process blocks the receipt of certain signals?

In UNIX, the set of masked signals can be set or cleared using the ________ function.

The usefulness of signals as a general inter process communication mechanism is limited because ____________

The usual effect of abnormal termination of a program is ____________

In UNIX, the abort() function sends the ________ signal to the calling process, causing abnormal termination.

In most cases, if a process is sent a signal while it is executing a system call ____________

A process can never be sure that a signal it has sent _____________

Thread pools are useful when ____________

Instead of starting a new thread for every task to execute concurrently, the task can be passed to a ___________

Each connection arriving at multi threaded servers via network is generally ____________

What is the idea behind thread pools?

If the thread pool contains no available thread ____________

Thread pools help in ____________

The number of the threads in the pool can be decided on factors such as ____________

Because of virtual memory, the memory can be shared among ____________

_____ is the concept in which a process is copied into the main memory from the secondary memory according to the requirement.

The pager concerns with the ____________

Swap space exists in ____________

When a program tries to access a page that is mapped in address space but not loaded in physical memory, then ____________

Effective access time is directly proportional to ____________

Which algorithm chooses the page that has not been used for the longest period of time whenever the page required to be replaced?

A process is thrashing if ____________

Working set model for page replacement is based on the assumption of ____________

Virtual memory allows ____________

The instruction being executed, must be in ____________

Error handler codes, to handle unusual errors are ____________

The ability to execute a program that is only partially in memory has benefits like ____________

In virtual memory. the programmer __________ of overlays.

Virtual memory is normally implemented by ________

A swapper manipulates ___________ whereas the pager is concerned with individual _______ of a process.

Using a pager ____________

The valid – invalid bit, in this case, when valid indicates?

A page fault occurs when?

When a page fault occurs, the state of the interrupted process is ____________