$5.$The following is a solution to solve the shared account balance problem.

Proc$\_0()1$

$/*$ Enter the CS $*/$

$P($mutex$)$ ;

balance $+=$ amount;

$v($mutex$)$ ;

$$

semaphore mutex $=1$;

fork $($proc$\_0,0)$:

fork $($proc$\_1,0)$;

proc$\_1()|$

$1*$ Enter the CS $*/$

$P($mutex$)$ ;

balance $-=$ amount;

$v($mutex$)$ ;

$5\mathrm{.}1.$ suppose we change the line "semaphore mutex $=1$; $"$ to "semaphore mutex $=0$; $".$ Is the solution still

correct? Please briefly explain. $(5$ points$)$

$5\mathrm{.}2.$suppose we change the line "semaphore mutex $=1$; $"$ to "semaphore mutex $=2$;$,".$ Is the solution still

correct? Please briefly explain. $(5$ points$)$