When using kernel level threads, a thread context switch within the same address space is equivalent or close to:

 a).-a function call

 b).-a system call

 c)-a process context switch

The i-node free list for a file system can usually be found in:

 a).-The i-node free list

 b).-The superblock

 c).-The boot block

 d).-The metadata block

If you are using a multiprocessor system and want to protect a short critical section, the best and most efficient choice will be:

 a).-disabling interrupts;

 b).-a mutex implemented using TestAndSet instruction

 c).-a semaphore implemented in the OS kernel

When using user level threads, a thread context switch within the same address space is equivalent/close to:

 a).-a function call

 b).-a system call

 c)-a process context switch