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| // using atomic_flag as a lock #include <iostream> // std::cout #include <atomic> // std::atomic_flag #include <thread> // std::thread #include <vector> // std::vector #include <sstream> // std::stringstream std::atomic_flag lock_stream = ATOMIC_FLAG_INIT; std::stringstream stream; void append_number(int x) { while (lock_stream.test_and_set()) {} stream << "thread #" << x << '\n'; lock_stream.clear(); } int main () { std::vector<std::thread> threads; for (int i=1; i<=10; ++i) threads.push_back(std::thread(append_number,i)); for (auto& th : threads) th.join(); std::cout << stream.str(); return 0; }
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