View Compilation Error

0_0_33525846_31453.cpp:7:1: error: 'mutex' does not name a type
 mutex mtx;
 ^
0_0_33525846_31453.cpp: In lambda function:
0_0_33525846_31453.cpp:331:13: error: 'mtx' was not declared in this scope
             mtx.lock();
             ^
0_0_33525846_31453.cpp: In lambda function:
0_0_33525846_31453.cpp:346:17: error: 'this_thread' has not been declared
                 this_thread::sleep_for(chrono::seconds(1));
                 ^
0_0_33525846_31453.cpp:349:17: error: 'thread' was not declared in this scope
                 thread t(f);
                 ^
0_0_33525846_31453.cpp:350:17: error: 't' was not declared in this scope
                 t.detach();
                 ^
0_0_33525846_31453.cpp:355:13: error: 'this_thread' has not been declared
             this_thread::sleep_for(chrono::seconds(1));
             ^