QUESTION $1$

Select two. Assume the CPU is handling hardware interrupt $\backslash$#$1$ when hardware interrupt $\backslash$#$2$ comes in$.$ Preempting handler $\backslash$#$1$ by handler $\backslash$#$2...$

A$.$ means control can return to handler $\backslash$#$1$ after handler $\backslash$#$2$ completes.

B$.$ is never an acceptable option.

C$.$ is acceptable only if interrupt $\backslash$#$2$ has higher priority.

D$.$ is generally not done in a real time environment if $\backslash$#$2$ has lower priority.

Monolithic kernels are theoretically less secure than microkernels because within a user process...

A$.$ a system call requires a mode switch from user to privileged mode.

B$.$ interprocess communication is required for most system calls.

QUESTION $3$

When user process A makes a system call in Linux it results in a jump from the user stack for process A to the

A$.$ kernel stack for process A$.$

B$.$ kernel's user stack.

C$.$ kernel's kernel stack.

QUESTION $4$

A thread is always more efficient than a process for which two activities?

A$.$ thread creation

B$.$ Sys$5$ IPC calls

C$.$ file open and file write calls

D$.$ thread termination

QUESTION $5$

Select the two true statements concerning mutex operations.

A$.$ If thread A locks a mutex thread B can unlock it$.$

B$.$ Multiple threads can lock a mutex $($similar to a counting semaphore$).$

C$.$ The ownder of a mutex is the thread that locked it$.$

D$.$ A thread blocks on a lock operation if the mutex is locked by another thread.

QUESTION $6$

In a deadlock avoidance approach such as Banker's algorithm...

A$.$ the three necessary conditions for deadlock are allowed to exist.

B$.$ there are no restrictions on when a process can access a resource.