#include #include #include #include #include using namespace std; namespace { // max numbers to print int const COUNT = 100; mutex mx; // condition variable for signalling // between threads, used along with // isOdd condition_variable cvar; bool isOdd{true}; void Even() { static int ecount{2}; unique_lock unqlck(mx, defer_lock); while (ecount <= COUNT) { unqlck.lock(); cvar.wait(unqlck, []() { return !isOdd; }); cout << setw(3) << ecount << setw(20) << "thread id :: " << this_thread::get_id() << '\n'; ecount += 2; // set the signalling variable // and notify any waiting // thread isOdd = true; cvar.notify_one(); unqlck.unlock(); } } // end Even void Odd() { static int ocount{ 1}; unique_lock unqlck(mx, defer_lock); //without defer_lock, the // mutex will be locked // immeidately while (ocount < COUNT) { unqlck.lock(); cvar.wait(unqlck, [=]() { return isOdd; }); cout << setw(3) << ocount << setw(20) << "thread id :: " << this_thread::get_id() << '\n'; ocount += 2; isOdd = false; cvar.notify_one(); unqlck.unlock(); } } // end Odd } // end namespace int main() { thread odd(Odd); thread even(Even); odd.join(); even.join(); }

Odd_Even_print_using_thread_event.cpp