FIXING the following codes : Using Pthread mutex locks to fix the race conditions. Test your now-thread-safe stack by creating 200 concurrent threads in main() that intermix pushing and popping values.

/* * Stack containing race conditions */

#include

#include

#include

// Linked list node

typedef int value_t;

typedef struct Node {

value_t data;

struct Node *next;

} StackNode;

// Stack function declarations

void push (value_t v, StackNode **top);

value_t pop ( StackNode **top);

int is_empty( StackNode *top);

int main(void) {

StackNode *top = NULL;

push(5, &top);

push(10,&top);

pop ( &top);

push(15,&top);

pop ( &top);

pop ( &top);

push(20,&top);

push(-5, &top);

pop ( &top);

push(-10,&top);

pop ( &top);

pop ( &top);

push(-15,&top);

pop ( &top);

push(-20,&top);

return 0;

}

// Stack function definitions

void push(value_t v, StackNode **top)

{

StackNode * new_node = malloc(sizeof(StackNode));

new_node->data = v;

new_node->next = *top;

*top = new_node;

}

value_t pop(StackNode **top)

{

if (is_empty(*top)) return (value_t)0;

value_t data = (*top)->data;

StackNode * temp = *top;

*top = (*top)->next;

free(temp);

return data;

}

int is_empty(StackNode *top) {

if (top == NULL) return 1;

else return 0;

}