The following code has critical section problems. Fix the critical section problems.

void *purchase_stock() { if (share_value < purchase_value) { //buy stocks float temp = floor(cash_in_hand / share_value); cash_in_hand -= temp*share_value; num_stocks_owned += temp; } } void *share_market_update() { share_value *= rand(-1,1); } void *sell_stocks() { if (share_value > sell_value) { //sell all stocks  profit = num_stocks_owned * share_value - original_investment; cash_in_hand += num_stocks_owned*share_value;  num_stocks_owned = 0; } }