Please explain the code line by line in detail. As im so confuse how the code work.

The code below is for Deadlock Prevention $-$ Hold$-$and$-$wait

Code:

void vector$\_$add$($vector$\_$t $*$ v$\_$dst$,$ vector$\_$t $*v\_$src $)\{$

pthread$\_$mutex$\_$lock$($&global$)$;

pthread$\_$mutex$\_$lock$($&v$\_$dst$->$lock$)$;

pthread$\_$mutex$\_$lock$($&v$\_$src$->$lock$)$;

pthread$\_$mutex$\_$unlock$($&global$)$;

int i;

for$($i$=0$; i$$ VECTOR$\_$SIZE; i$++)\{$

v$\_$dst$->$value$[$i$]=$v$\_$dst$->$values$[$i$]+$ v$\_$src$->$values$[$i$]$;

$\}$

pthread$\_$mutex$\_$unlock$($&v$\_$dst$->$lock$)$;

pthread$\_$mutex$\_$unlock$($&v$\_$src$>$lock$)$;

$\}$