#include <thread>
  2 #include <iostream>
  3 #include <mutex>
  4 using namespace std;
  5 mutex _mutex1;
  6 mutex _mutex2;
  7 int date1;
  8 int date2;
  9 int do_work_1()
 10 {
 11     cout <<  "thread_1 start" << endl;
 12     lock_guard<mutex> locker1(_mutex1);
 13     date1++;
 14     this_thread::sleep_for(chrono::seconds(1));
 15     lock_guard<mutex> locker2(_mutex2);
 16     date2++;
 17     cout << "thread_1 end" << endl;
 18     return 0;
 19 }
 20 int do_work_2()
 21 {
 22     cout << "thread_2 start" << endl;
 23     lock_guard<mutex> locker2(_mutex2);
　　　 date2++;
 25     this_thread::sleep_for(chrono::seconds(1));
 26     lock_guard<mutex> locker1(_mutex1);
 27     date1++;
 28     cout << "thread_2 end" << endl;
 29     return 0;
 30 }
 31 int main()
 32 {
 33     thread t1(do_work_1);
 34     thread t2(do_work_2);
 35     t1.join();
 36     t2.join();
 37     cout << "end" << endl;
 38     return 0;
 39 
 40 }