University of California Los Angeles C Programming Code Project Consider this variable x as critical section. That is : many threads will compete to update

University of California Los Angeles C Programming Code Project Consider this variable x as critical section. That is : many threads will compete to update this variable.

int x = 80;

pthread_mutex_t one_lock = PTHREAD_MUTEX_INITIALIZER;

declare three functions

void * add1 ( void *a )

{

add code with mutex to increment x by *a and unlock the mutex

}

void * add2 ( void *b )

{

add code with mutex to increment x by b unlock the mutex

}

void * add3 ( void *c )

{

add code with mutex to increment x by c unlock the mutex

}

in the main function:

Create three threads using create function :

pthread_t t1, t2, t3 ;

int x1 = 10, x2 = 20, x3 = 30;

while creating thread t1, pass add1 function and variable x1

while creating thread2, pass add2 function and variable x2

while creating thread3, pass add3 function and variable x3

wait for the threads to terminate

print the value of x now

}

_________________________use this _______________________________________________

#include
#include
#include

int x = 80; // SHARED VARIABLE AMONG THREADS
pthread_mutex_t one_lock = PTHREAD_MUTEX_INITIALIZER;

void add1 ( void *a )
{
// TASK 1
// use mutex to lock before increment
// add code to increment the global variable x by *a
// use mutex to unlock before increment

}

void add2 ( void *b )
{
// TASK 2
// use mutex to lock before increment
// add code to increment the global variable x by *b
// use mutex to unlock before increment

}

void add3 ( void *c )
{
// TASK 3
// use mutex to lock before increment
// add code to increment the global variable x by *c
// use mutex to unlock before increment

}

int main ( )
{

pthread_t T1, T2, T3;
int a = 10, b = 20, c = 30;
// TASK 4
// create the thread T1 and pass the function add1

// TASK 5
// create the thread T2 and pass the function add2

// TASK 6
// create the thread T3 and pass the function add3

// TASK 7
// wait for the threads
//

// TASK 8
// print the value of x, it should be 140
//
}