C++14读写锁demo-读写操作都在子线程中

#include 
#include 
#include 
#include 
#include 

using namespace std;

shared_timed_mutex sLock;
int data = 10;
bool threadExitFlag = false;

unsigned long getTime()
{
    chrono::system_clock clock;
    int64_t s = chrono::duration_cast<chrono::seconds>(
                clock.now().time_since_epoch()).count();
    return s;
}

void read_shared_data(int id)
{
    while(!threadExitFlag){
            shared_lock<shared_timed_mutex> slk(sLock);
            cout << getTime() << " read thread " << id << " data=" << data << endl;

            this_thread::sleep_for(chrono::milliseconds(100));
    }
}

void addDataFunc(int id){
    while(!threadExitFlag){
        {
            unique_lock<shared_timed_mutex> ulk(sLock);        //写锁加锁

            cout << getTime() << " write thread "<< id << " begin,num:"<< ++data<<"-------------" << endl;

            if(data == 20){
                threadExitFlag = true;
            }

        }

        this_thread::sleep_for(chrono::milliseconds(200));
    }
}

int main()
{
    thread t1(read_shared_data, 1);                    //启动线程t1
    thread t2(read_shared_data, 2);                    //启动线程t2
    thread t3(addDataFunc,0);

    t1.join();
    t2.join();
    t3.join();

    return 0;
}

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输出为：

1667375955 read thread 1 read data=10
1667375955 read thread 2 read data=10
1667375955 write thread 0 begin,num:11-------------
1667375955 read thread 2 read data=11
1667375955 read thread 1 read data=11
16673759551667375955 read thread  read thread 2 read data=1 read data=1111

1667375955 read thread 1 read data=11
1667375955 read thread 2 read data=11
1667375955 write thread 0 begin,num:12-------------
1667375955 read thread 2 read data=12
1667375955 read thread 1 read data=12
1667375955 read thread 1 read data=12
1667375955 read thread 2 read data=12
1667375955 write thread 0 begin,num:13-------------
1667375955 read thread 2 read data=13
1667375955 read thread 1 read data=13
16673759551667375955 read thread  read thread 21 read data=13 read data=13

1667375955 write thread 0 begin,num:14-------------
1667375955 read thread 2 read data=14
1667375955 read thread 1 read data=14
16673759551667375955 read thread  read thread 2 read data=1 read data=1414

1667375956 write thread 0 begin,num:15-------------
1667375956 read thread 2 read data=15
1667375956 read thread 1 read data=15
1667375956 read thread 1 read data=15
1667375956 read thread 2 read data=15
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