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- #include<iostream>
- #include<cstdint>
- #include<vector>
- #include<future>
- #include<mutex>
- using namespace std;
- struct Account
- {
- int balance = 0;
- mutex m;
- bool Spend(int value)
- {
- lock_guard<mutex> guard(m);
- //m.lock();
- if (value <= balance)
- {
- balance -= value;
- //m.unlock();
- return true;
- }
- //m.unlock();
- return false;
- }
- };
- int SpendMoney(Account& account)
- {
- int total_spent = 0;
- for (int i = 0; i < 100000; ++i)
- {
- if (account.Spend(1))
- {
- ++total_spent;
- }
- }
- return total_spent;
- }
- int main()
- {
- Account family_account{ 100000 };
- auto husband = async(SpendMoney, ref(family_account));
- auto wife = async(SpendMoney, ref(family_account));
- auto son = async(SpendMoney, ref(family_account));
- auto daughter = async(SpendMoney, ref(family_account));
- int spent = husband.get() + wife.get() + son.get() + daughter.get();
- cout << "Total spent: " << spent << endl
- << "Balance: " << family_account.balance << endl;
- /*cout << "Total spent: " << SpendMoney(family_account) << endl
- << "Balance: " << family_account.balance << endl;*/
- }
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