When the process is in the $\frac{\text{I}}{O}$ waiting queue, waiting for the $\frac{\text{I}}{O}$ to complete. When the $\frac{\text{I}}{O}$ completes the status of the process will be changed to running

Select one:

True

False

There are four concurrent processes $W,x,Y$ and $Z.$ All have a shared variable $\text{'}c\text{'}.W$ and $x$ work as follow reads $c$ from memory, increment by one, store $c$ in memory. $Y$ and $Z$ work as follow reads $c$ from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore $s=2,$ what is the maximum value of $c$ after all four processes complete execution?

Select one:

a$.2$

b$.-1$

c$.-2$

d$.1$

Assume a computer system has a TLB hit ratio of $90\%.$ It requires $20$ nanoseconds to access the TLB$,$ and $80$ nanoseconds to access main memory. What is the effective memory access time for this system

Select one:

a$.108$

b$.100$

c$.180$

d$.108\mathrm{.}5$

What is the output of the following code:

int main$()$

$\{$

int $x=5$;

if $($fork$()==0)$

else

$x++$;

xcdots;

printf$("\%$d $\frac{\frac{?}{?}}{t}",x)$; $//$print value of $x$

return $$;

$]$

Select one:

a$.5$

b$.6$

c$.4$

d$.64$ or $46$n