Goal

Practice threads synchronization and cooperatively execute some tasks, while solving some

related issues like deadlocks and races.

Reference: the textbook chapter $4$ to $6.$

Description

Please read the complete assignment document carefully before starting.

Write a program $($C Pthread is suggested but you can also use java or windows if you prefer$)$

which will have to create $4$ threads. These $4$ threads share some resources and cooperatively

execute some tasks.

The program should have $3$ integer variables shared among all threads, int: $a,b$ and turn.

These variables should be the only global variables. Any other needed variables should be

declared as a local variable to each function$/$thread$.$ The main$()$ thread should ask the user to

enter a zero or positive values: for variables $a,b,$ and turn $($use scanf$).$ turn can take only

values from $0$ to $3.$ Then the main$()$ thread should create the $4$ theads and $t3).$

Each thread will run on a different function with the prototype: void $*$thrn$(),$ where $n$ is the

thread number $(0$ to $3).$

Once started, the thread scheduling should work as follows:

a$.$ The threads will run in round robin $($RR$)$

b$.$ The value of the variable turn define which thread will run first e$.$g$.,$ if turn$=2$ then

$Th2$ Th $3$ Th $0$ Th $1$ Th $2$dots

c$.$ The value of the variable a define the number of threads RR repetition before

terminating e$.$g$.,$ if $a=2$ and turn $=0$ then

$Th0Th1Th2Th3Th0Th1Th2Th3.$

d$.$ Only $1$ thread is allowed to execute its critical section $($CS$)$ at a time. E$.$g$.,$ when Th$0$

is executing, all other threads should be in a busy wait $($BW$).$

e$.$ When an executing thread exit its CS it must set the value of variable turn to the

next Thread to execute.

f$.$ Then main$()$ thread $($or the parent thread$)$ should wait $($join$)$ after all $4$ children

threads to terminate before continuing the execution of its remaining section to

produce some useful data then terminates.

Each thread task is as follows:

a$.$ Th$0$: calculates $b=b+1,$ print the Thead # and $b$ value for an a repetition

b$.$ Th$1$: calculates $b=b+2,$ print the Thead # and $b$ value for an a repetition

c$.$ Th$2$: calculates $b=b+3,$ print the Thead # and $b$ value for an a repetition

d$.$ Th$3$: calculates $b=b+4,$ print the Thead # and $b$ value for an a repetition

Solve everything thank you