[SOLVED] weird crash in sf::thread

[Gadam]

Hi,

While switching from SFML 2.3.2 to 2.4.0 on a big project, I run in a rather weird crash...

Here is a simple version :

class Base
{
public :
    virtual void foo(){};
};

class Deriv
    : public Base
{
public :
    virtual void foo(){
        printf( "hello\n" );
        sf::Font zFont;
        zFont.loadFromFile( "depend/calibri.ttf" ); //ok!
        sf::Text zText( "yolo", zFont );
        zText.getGlobalBounds();    //crash
    }
};

int main()
{
    Deriv instance;

    sf::Thread thread( &Deriv::foo, &instance );
    thread.launch();

}

1. In this example, the program crash as sool as getGlobalBounds is called.
(More precisely, it only works fine if we remove this call - my debugger is lost and cannot help more)

2. When creating the thread, if we give Base::foo instead of Deriv::foo (which should be the same), I get an error on the SFML code.

error: must use '.*' or '->*' to call pointer-to-member function ...

Note : everything was fine on SFML 2.3.2

I use Code::Blocks with mingw32-gcc-4.9.2

Have you a clue where it can come from ?
Can it be because of a bad library/compiler configuration ?

[DarkRoku12]

Try adding a thread.join() before the main function return ; if you are using c++11 is best to use the <thread> header and use .join()/detach().


This post (answer) is a good reading about threads and resources.


Issue number 2 is resolved with

sf::Thread thread( &Base::foo, static_cast< Base* >(&instance) );
 

[binary1248]

This has less to do with the threading itself than it has to do with the stack overflow caused by #989. We are aware of this, and a fix has already been submitted for review and testing. It won't be long until this issue is fixed in the 2.4.1 release.

In the mean time, you can build the current feature/no_internal_context branch and work with that.

[Gadam]

@DarkRoku : static_cast solves it indeed
@binary1248 : Looking forward for it

Thanks for your help
And good work guys, SFML rocks