#include

#include

#include

#include

struct {int balance[2];} Bank={{100,100}}; //global variable defined

void* MakeTransactions() { //routine for thread execution

int i, j, tmp1, tmp2, rint; double dummy;

for (i=0; i < 100; i++) {

rint = (rand()%30)-15;

if (((tmp1=Bank.balance[0])+rint)>=0 && ((tmp2=Bank.balance[1])-rint)>=0) { Bank.balance[0] = tmp1 + rint;

for (j=0; j < rint*1000; j++) {dummy=2.345*8.765/1.234;} // spend time on purpose

Bank.balance[1] = tmp2 - rint; }

}

return NULL;

}

int main(int argc, char **argv) {

int i; void* voidptr=NULL; pthread_t tid[2];

srand(getpid());

printf("Init balances A:%d + B:%d ==> %d! ", Bank.balance[0],Bank.balance[1],Bank.balance[0]+Bank.balance[1]);

for (i=0; i<2; i++) if (pthread_create(&tid[i],NULL,MakeTransactions, NULL)) { perror("Error in thread creating "); return(1); }

for (i=0; i<2; i++) if (pthread_join(tid[i], (void*)&voidptr)) {

perror("Error in thread joining "); return(1);}

printf("Let's check the balances A:%d + B:%d ==> %d ?= 200 ", Bank.balance[0],Bank.balance[1],Bank.balance[0]+Bank.balance[1]);

return 0;

}

1.Use thread library calls (mutex lock and unlock) to modify the code to remove any potential race conditions. Show your modification of the code and explain the outcome with your modification