$10-$ A disk queue is made of the I$/$O operation requests that acquire the following tracks:

$15$

$166$

$85$

$96$

$185$

$165$

$95$

Calculate the total head movement to satisfy all requests for the C$-$LOOK, SSTF$,$ C$-$Scan, and FCFS disk scheduling algorithms $(3$ pts$.$ each$).$ The current position of the read$/$write head is track $105$ and tracks are numbered from $0$ to $399.$ If the read$/$write head has a choice of direction for movement, then it moves toward track $399.($PLEASE SHOW ALL OF YOUR WORK.$)$

$11-$ Re$-$write the following nested region construct using atomic operations of P and V $(5$ pts$.)$

Region x do region y do Region z do Region w do S$1$;