SS2024: Exam 2024-06-28 (Handout)¶

Name

Linux: OS Concepts¶

Kernel/user space: which of the following statements are true?

Statement	True	False
In kernel space there exists the concept of a process
In user space there exists the concept of a process
Interrupts are generally serviced in user space
Interrupts are generally serviced in kernel space
Scheduling of processes is done by the kernel
Address spaces are implemented in user space

The term “blocking” describes which behavior? (One answer)

Statement	True	False
A process can block another for communication purposes
A process consumes no CPU time while it waits for an event to happen
The kernel blocks access to network resources to enhance system security

Scheduling: which of the following statements are true?

Statement	True	False
A timeslice is the amount of time that a process can run until it is suspended in favor of other processes
Fair scheduling ensures that network resources are evenly shared
On a single-CPU machine, no process may enter an infinite loop - or else, the entire machine will come to a halt
Fair scheduling ensures that every process gets its fair share of CPU resources
The scheduler gives processes the illusion that each of them owns the CPU
A context switch happens when one process enters a blocking system call

Virtual Memory: which of the following statements are true?

Statement	True	False
A process can own all memory in the system
The kernel is the owner of all memory in the system
All processes share a single address space
Each process in the system has its own address space
An address space is three-dimensional

Processes: which of the following statements are true?

Statement	True	False
A process is identified by its process ID
A process is identified by its pthread context number
Processes are arranged in a process hierarchy, starting at process 1
A process may have multiple parents
Every process has a parent process
Every process except process 1 has a parent process

Compiler: which of the following statements are true?

Statement	True	False
The compiler combines multiple object files together into one executable
The compiler turns a single source file into an object (`.o`) file
Object files are not executable
Object files are executable

Cross: which of the following statements are true?

Statement	True	False
The cross compiler is an executable that runs on the build machine
The cross compiler is an executable that runs on the target machine
The cross compiler is linked against the C runtime (`libc.so`). That file is contained in the sysroot.
The output that is produced by a cross toolchain runs on the target machine.
The output that is produced by a cross toolchain is linked against the C runtime (`libc.so`). That file is contained in the sysroot.

Statement	True	False
The linker combines multiple object files together into one executable
The linker combines multiple object files together into a static library