Consider the following multi$-$threaded C pseudocode:

$1.$ void$*$ getMsg$()\{$

$2.$ lock$($&mutex$)$;

$3.$ sem$\_$wait$($&sem$)$;

$4.$ void$*$ msg $=$ popQueue$($&queue$)$;

$5.$ unlock$($&mutex$)$;

$6.$ return msg;

$7.\}$

$8.$ void addMsg$($void$*$ msg$)\{$

$9.$ lock$($&mutex$)$;

$10.$ pushQueue$($&queue, msg$)$;

$11.$ unlock$($&mutex$)$;

$12.$ sem$\_$post$($&sem$)$;

$13.\}$

How can you fix the bug$($s$)$ in this code? Select all of the changes that must be applied to make this

code work.