1 #include <iostream>
2 #include <thread>
3 #include <mutex>
4 using namespace std;
5
6 #define N 100000
7
8 mutex g_mutex;
9
10 void add(int *p)
11 {
12 for (int i = 0; i < N; i++)
13 {
14 //拥有mutex所有权,自动加锁自动解锁,读取失败就会一直等待
15 //lock_guard<mutex> lgd(g_mutex);
16 //unique也能加锁,但是速度比较慢,根据块语句锁定,根据mutex属性能否加锁
17 unique_lock<mutex> ulk(g_mutex);
18 (*p)++;
19 }
20 }
21
22 void main()
23 {
24 int a = 0;
25 thread t1(add, &a);
26 thread t2(add, &a);
27 t1.join();
28 t2.join();
29 cout << a << endl;
30 cin.get();
31 }
