锁问题总结-同一个线程两次获取同一把锁

锁的问题-同一个线程两次获取同一把锁

结果：会直接报异常

#include <iostream>
#include <mutex>

using namespace std;


class ErrorLockUsage
{
public:
    void DisplayStr()
    {
        lock_guard<mutex> lockGuard(m_SourceLock);
        cout << m_strSouce<<endl;
    }

    void PushBackBehind(char c)
    {
        lock_guard<mutex> lockGuard(m_SourceLock);
        m_strSouce.push_back(c);
        DisplayStr();//在该函数中又获取一次
    }

private:
    string m_strSouce;
    mutex m_SourceLock;
};

int main()
{
    ErrorLockUsage eu;
    eu.PushBackBehind('a');
    cout << "Hello World!" << endl;
    return 0;
}