02-Memory-and-scheduling.yaml

---
course: 'CSCI 3431: Operating Systems'
qznumber: 2
qzdate: '13 October 2014'
qztitle: 'Memory'
instructions: |
    Answer each of the following questions in complete sentences. 
    Take note of point values.

question:

- keywords: memory access
  points: 2
  text: |
    Are the TLB valid bit and the PTE valid bit the same? 
    If not, what are their differences?

- keywords: malloc
  points: 2
  text: |
    What does the \texttt{malloc()} library call take as an argument?
    What does it return?

- keywords: segmentation
  points: 10
  text: |
    Work out whether the following virtual address accesses are valid. \newline
    For valid memory accesses, write out the translated physical address. \newline

    Address space size: 1k \quad Phys mem size: 16k  \newline
    
    Segment register information:  \newline
    
      Segment 0 base  (grows positive) : 5994 (decimal)  \newline
      Segment 0 limit                  : 414  (decimal)  \newline
    
      Segment 1 base  (grows negative) : 9989 (decimal)  \newline
      Segment 1 limit                  : 392  (decimal)  \newline
    
    \begin{table}[h]
    \centering
    \scalebox{1.2}{%
    \begin{tabular}{|l|l|l|}
    \hline
    \textbf{Memory Access} & \textbf{Valid (y/n)} & \textbf{Physical Address} \\ \hline
    VA 0: 808 (decimal)    & yes                  & Segment 1: 9773 (decimal) \\ \hline
    VA 1: 844 (decimal)    &                      &                           \\ \hline
    VA 2: 392 (decimal)    &                      &                           \\ \hline
    VA 3: 608 (decimal)    &                      &                           \\ \hline
    VA 4: 169 (decimal)    &                      &                           \\ \hline
    VA 5: 943 (decimal)    &                      &                           \\ \hline
    \end{tabular}
    }
    \end{table}

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