Multi-thread problem

Silent_Alex

Hi everyone:
Currrently, I'm working with the project that was involved in the technology multi-thread. There is a promblem confused with me. it can be reprocude with minimal demo as the following code snippet:

//test_a.h

#include <QThread>
#include <QObject>

class Test_A: public QThread
{
    Q_OBJECT
public:
    static Test_A *GetInstance();
    ~Test_A();
    void run();

public slots:
    void init();
    void exitCtl();

private:
    Test_A()=default;

    bool bScaning = false;
};

//test_a.cpp

Test_A* Test_A::GetInstance()
{
    static Test_A obj;
    return &obj;
}

void Test_A::run()
{
    bScaning = true;
    while (bScaning) {
    }
}

void Test_A::exitCtl()
{
    bScaning = false;

}

It's well known that the function run will be invked in the another thread. Hence, Is there need for declaring the variable bScaning is of the type bool to std::atomic_bool? Additionally, Is there need for modifing the variable bScaning via std::atomic::store and std::atomic::load?

Thanks for everyone who provide a feedback for this problem in advance!

Christian Ehrlicher

@Silent_Alex said in Multi-thread problem:

Hence, Is there need for declaring the variable bScaning is of the type bool to std::atomic_bool?

Yes

Additionally, Is there need for modifing the variable bScaning via std::atomic::store and std::atomic::load?

No, assigning will be enough here.

Silent_Alex

@Christian-Ehrlicher Thank, Bro! 😀