Consider the following function process$().$ Consider that there are N threads, each thread starting with this function. Master thread is one with rank zero. Write the modified function $($may delare any global variables above the function$)$ for the requirements given below. Please do not use any user$-$defined function except Pthread API.

Int global$=10$;

Int K$=5$;

void process$($int rank, char mod$)$

$/*$the mode$=$R$$ reading or mode $=$W$$ writing$*/$

$\{$

$/*$the following should be executed by master threads only$*/$

Global$+=$rank;

$/*$the following should be executed only by one thread at a time$*/$

Printf$($global $=\%$d

$,$ global$++)$;

$/*$the following code area should be entered exactly by three threads only, not one, two or more than three$*/$

Printf$(***$

$)$;

$/*$the following code area rule: if the mode is R$,$ then it is allowed only if there is no thread for W in the area. If the mode is W$,$ then it is allowed only if there is no thread with R in the area$*/$

Printf$(\%$d

$,$ K$++)$; $/*$ executed by thread with mode R$*/$

K$++$; $/*$ executed by thread with mode W$*/$